Publications

Articles, Prospecti, Dissertations, Other

Articles [By Molecule]

• Warm and diffuse gas in the Central Molecular Zone revealed by the infrared spectrum of H₃⁺. T. Oka, T. R. Geballe, M. Goto, T. Usuda, N. Indriolo, and B. J. McCall, Proceedings of the Galactic center Workshop 2009, (2010) in press.
• Dust and gas in the nucleus of NGC 1068: Comparison to the Galactic center’s Central Molecular Zone. T. R. Geballe, R. E. Mason, and T. Oka, Proceedings of the Galactic center Workshop 2009, (2010) in press.
• Constraining the environment of CH+ formation with CH₃⁺ observation. N. Indriolo, T. Oka, T. R. Geballe, and B. J. McCall, Astrophys. J.711, 1338-1342 (2010).
• Orders of Magnitude and Symmetry in Molecular Spectroscopy. T. Oka, Handbook on High Resolution Spectroscopy, edit. M. Quack and F. Merkt, John Wiley and Sons, (2010) in press.
• Two new and remarkable sightlines through the Galactic center’s molecular gas. T. R., Geballe and T. Oka, Astrophys. J. 709, L70-73 (2010).
• Studies of the diffuse interstellar bands. IV. HD 183143. H. M. Hobbs, D. G. York, J. A. Thorburn, T. P. Snow, M. Bishof, S. D. Friedman, B. J. McCall, T. Oka, P. Sonnentrucker, and D. E. Welty, Astrophys. J. 705, 32-45 (2009).
• H₃⁺ as the benchmark for rigorous ab initio theory. C. P. Morong, J. L. Gottfried, and T. Oka, J. Mol. Spectrosc. 255, 13-23 (2009).
• Absorption line survey of H₃⁺ toward the Galactic center sources II. Eight infrared sources within 30 pc of the Galactic center. M. Goto, T. Usuda, T. Nagata, T. R. Geballe, B. J. McCall, N. Indriolo, H. Suto, T. Henning, C. P. Morong, and T. Oka, Astrophys. J. 688, 306-319 (2008).
• A catalogue of diffuse interstellar bands in the spectrum of HD 204827. L. M. Hobbs, D. G. York, T. P. Snow, T. Oka, J. A. Thorburn, M. Bishof, S. D. Friedman, B. J. McCall, B. Rachford, P. Sonnentrucker, and D. E. Welty, Astrophys. J. 680, 1256-1270 (2008).
• H₃⁺ in diffuse interstellar clouds: A tracer for the cosmic-ray ionization rate. N. Indriolo, T. R. Geballe, T. Oka, and B. J. McCall, Astrophys. J. 671, 1736-1747 (2007).
• Near-infrared spectroscopy of H₃⁺ above the barrier to linearity,
  J. L. Gottfried, Philos. Trans. R. Soc. London, Ser. A 364, 2917-2929 (2006).
• Corrections and addendum. T. Oka, Phil. Trans. R. Soc. Lond. A364, 3149-3151 (2006).
• Introductory remark. T. Oka, Phil. Trans. R. Soc. Lond. A 364, 2847-2853 (2006).
• Interstellar H₃⁺. T. Oka, Proc. Natl, Acad. Sci. U. S. A. 103, 12235-12242 (2006).
• A key molecular ion in the Universe and in the Laboratory. T. R. Geballe and T. Oka, Science 312, 1610-1612 (2006).
• Interstellar medium of IRAS 08572 + 3915 NW : H₃⁺ and warm high velocity CO. T. R. Geballe, M. Goto, T. Usuda, T. Oka, and B. J. McCall, Astrophys. J. 644, 907-913 (2006).
• Nuclear spin conversion in molecules. J. T. Hougen and T. Oka, Science 310, 1913-1915 (2005).
• High-resolution stimulated Raman gain spectroscopy of parahydrogen crystals. T. Momose and T. Oka, J. Low Temp. Phys. 139, 515-522 (2005)
• Hot and diffuse clouds near the Galactic center probed by metastable H₃⁺. T. Oka, T. R. Geballe, M. Goto, T. Usuda, and B. J. McCall, Astrophys. J. 632, 882-893 (2005).
• Search for H₃⁺ in HD 141569 A. M. Goto, T. R. Geballe, B. J. McCall, T. Usuda, H. Suto, H. Terada, N. Kobayashi, and T. Oka, Astrophys. J. 629, 865-872 (2005).
• Nuclear spin selection rules in chemical reactions by angular momentum algebra,
  T. Oka, J. Mol. Spectrosc. 228, 635-639 (2004).
• Atomic and molecular emission lines from the red rectangle,
  L. M. Hobbs, J. A. Thorburn, T. Oka, J. Barentine, T. P. Snow, D. G. York, Astrophys. J. 615, 947-957 (2004).
• H₃⁺ line survey towards the Galactic center,
  M. Goto, B. J. McCall, T. R. Geballe, T. Usuda, and T. Oka, Springer Proceedings in Physics 91, 537-540 (2004).
• Near-infrared electronic spectrum of CH₂⁺,
  J. L. Gottfried and T. Oka, J. Chem. Phys. 121, 11527-11529 (2004).
• High-resolution spectroscopy of the 2²Π_u ← X⁴Σ_g^- forbidden transitions of C₂⁺,
  C. G. Tarsitano, C. F. Neese, and T. Oka, J. Chem. Phys. 121, 6290-6297 (2004).
• The nonthermal rotational distribution of H₃⁺,
  T. Oka and E. Epp, Astrophys. J. 613, 349-354 (2004).
• The ubiquitous H₃⁺,
  T. Oka, Springer Proceedings in Physics 91, 37-42 (2004).
• H₃⁺ in dark clouds,
  T. R. Geballe, B. J. McCall, T. Oka, in “Chemistry as a Diagnostic of Star Formation” (C. L. Curry and M. Fich, Eds.), pp. 46-49, National Research Council of Canada, Ottawa, 2003.
• Microwave and infrared spectroscopy of molecular ions,
   T. Oka, in "Encyclopedia of Mass Spectrometry" (P. B. Armentrout, Ed.), pp. 217-226, 2003.
• Enigma of H₃⁺ in diffuse interstellar clouds,
  B. J. McCall and T. Oka, in “Dissociative Recombination of Molecular Ions with Electrons” (S. L. Guberman, Ed.), pp. 365-371, Kluwer Academic/Plenum Publishers, New York, 2003.
• Help!!! Theory for H₃⁺ recombination badly needed,
  T. Oka, in “Dissociative Recombination of Molecular Ions with Electrons” (S. L. Guberman, Ed.), pp. 209-220, Kluwer Academic/Plenum Publishers, New York, 2003.
• Observation of interstellar H₃⁺ using Subaru IRCS. The galactic center,
  M. Goto, B. J. McCall, T. R. Geballe, T. Usuda, N. Kobayashi, H. Terada, and T. Oka, Astronomical Society of the Pacific Conference Series  289, 189-193 (2003).
• Near-infrared spectroscopy of H₃⁺ above the barrier to linearity,
  J. L. Gottfried, B. J. McCall, and T. Oka, J. Chem. Phys. 118, 10890-10899 (2003).
• Rotational analysis of the (3,3) and (4,4) bands of the A²Π_u ← X⁴Σ_g⁺ system of N₂⁺ in the near-infrared using velocity modulation spectroscopy,
  C. G. Tarsitano and T. Oka, J. Mol. Spectrosc. 219, 263-270 (2003).
• A remeasurement of the 2.4 μm spectrum of J=1 H₂ pairs in a parahydrogen crystal,
  C. M. Lindsay, T. Oka, and T. Momose, J. Mol. Spectrosc. 218, 131-133 (2003).
• Stimulated Stokes downconversion in liquid and solid parahydrogen,
  B. J. McCall, A. J. Huneycutt, R. J. Saykally, C. M. Lindsay, T. Oka, M. Fushitani, Y. Miyamoto, and T. Momose, Appl. Phys. Lett. 82, 1350–1352 (2003).
• Some diffuse interstellar bands related to interstellar C₂ molecules,
  J. A. Thorburn, L. M. Hobbs, B. J. McCall, T. Oka, D. E. Welty, S. D. Friedman, T. P. Snow, P. Sonnentrucker, and D. G. York, Astrophys. J. 584, 339–356 (2003).
• Observations of C₃ in translucent sight lines,
  T. Oka, J. A. Thorburn, B. J. McCall, S. D. Friedman, L. M. Hobbs, P. Sonnentrucker, D. E. Welty, and D. G. York, Astrophys. J. 582, 823–829 (2003).
• Absorption line survey of H₃⁺ toward the Galactic Center sources I. GCS 3-2 and GC IRS3,
  M. Goto, B. J. McCall, T. R. Geballe, T. Usuda, N. Kobayashi, H. Terada, and T. Oka, Publ. Astron. Soc. Jpn. 54, 951–961 (2002).
• Planet formation: Enigmatic emission, T. Oka, Nature 418, 31–33 (2002).
• A critical examination of the l-C₃H₂^- spectrum and the diffuse interstellar bands,
  B. J. McCall, T. Oka, J. Thorburn, L. M. Hobbs, and D. G. York, Astrophys. J. 567, L145–L148 (2002).
• Observations of H₃⁺ in the diffuse interstellar medium,
  B. J. McCall, K. H. Hinkle, T. R. Geballe, G. H. Moriarty-Schieven, N. J. Evans II, K. Kawaguchi, S. Takano, V. V. Smith, and T. Oka, Astrophys. J. 567, 391–406 (2002).
• Comprehensive evaluation of H₃⁺ Spectroscopy,
  C. M. Lindsay and B. J. McCall,. J. Mol. Spectrosc. 210, 60-83 (2001).
• Survey of H₃⁺ transitions between 3000 and 4200 cm^-1,
  C. M. Lindsay, R. M. Rade, Jr., and T. Oka, J. Mol. Spectrosc. 210, 51–59 (2001).
• Rejection of the C₇^- diffuse interstellar band hypothesis,
  B. J. McCall, J. Thorburn, L. M. Hobbs, T. Oka, and D. G. York, Astrophys. J. 559, L49–L53 (2001).
• Sharp spectral lines observed in γ-ray ionized parahydrogen crystals,
  T. Momose, C. M. Lindsay, Y. Zhang, and T. Oka, Phys. Rev. Lett. 86, 4795–4798 (2001).
• High resolution infrared spectroscopy of neutral and ion clusters in para-H₂ crystals,
  T. Oka, in “Nobel Symposium on Cluster Physics” (M. Larsson and E. Campbell, Eds.), pp. 191–205, World Scientific, Singapore, 2001.
• Fine structure of the H₂ 5g-4f inter-Rydberg transition revealed by difference frequency laser spectroscopy,
  D. Uy, C. M. Gabrys, T. Oka, B. J. Cotterell, R. J. Stickland, Ch. Jungen, and A. Wüest, J. Chem. Phys. 113, 10143–10153 (2000).
• Selection rules for nuclear spin modifications in ion-neutral reactions involving H₃⁺,
  M. Cordonnier, D. Uy, R. M. Dickson, K. E. Kerr, Y. Zhang, and T. Oka, J. Chem. Phys. 113, 3181–3193 (2000).
• Measurement of the H₃⁺ destruction rate due to ambipolar diffusion in an AC positive column discharge,
  C. M. Lindsay, E. T. White, and T. Oka, Chem. Phys. Lett. 328, 129–134 (2000).
• Introductory remarks (On astronomy, physics, and chemistry of H₃⁺),
  T. Oka, Philos. Trans. R. Soc. London, Ser. A 358, 2363–2369 (2000).
• Laboratory spectroscopy of H₃⁺,
  Benjamin J. McCall,  Philos. Trans. R. Soc. London, Ser. A 358, 2385-2401 (2000).
• Combination band spectroscopy of H₃⁺,
  B. J. McCall and T. Oka, J. Chem. Phys. 113, 3104–3110 (2000).
• Infrared Spectrum of p-hydrogen crystals ionized by 3 MeV electrons: Cluster ions of hydrogen in condensed phase,
  M.-C. Chan, M. Okumura, and T. Oka, J. Phys. Chem. A 104, 3775–3779 (2000).
• H₃⁺ — an ion with many talents,
  B. J. McCall and T. Oka, Science 287, 1941–1942 (2000).
• H₃⁺ in the diffuse interstellar medium: the enigma related to dissociative recombination,
  T. Oka, in “Dissociative Recombination: Theory, Experiment, and Applications IV” (M. Larsson, J. B. A. Mitchell, and I. F. Schneider, Eds.), pp. 13–24, World Scientific, Singapore, 2000.
• Observations of diffuse interstellar bands attributed to C₇^-,
  B. J. McCall, D. G. York, and T. Oka, Astrophys. J. 531, 329–335 (2000).
• CH₅⁺ stability and mass spectrometry,
  E. T. White and T. Oka, Science 286, 1051 (1999).
• Observations of H₃⁺ in dense molecular clouds,
  B. J. McCall, T. R. Geballe, K. H. Hinkle, and T. Oka, Astrophys. J. 522, 338–348 (1999).
• Infrared spectroscopy of H₃O⁺: The ν₁ fundamental band,
  J. Tang and T. Oka, J. Mol. Spectrosc. 196, 120–130 (1999).
• CH₅⁺: The infrared spectrum observed,
  E. T. White, J. Tang, and T. Oka, Science 284, 135–137 (1999).
• Detection of H₃⁺ in the diffuse interstellar medium: the Galactic center and Cygnus OB2 Number 12,
  T. R. Geballe, B. J. McCall, K. H. Hinkle, and T. Oka, Astrophys. J. 510, 251–257 (1999).
• Recent Observations of H₃⁺ in Molecular Clouds, T. R. Geballe, B. J. McCall, and T. Oka, , in "Star Formation with the Infrared Space Observatory", ASP Conference Series, (J. L. Yun and R. Liseau, Eds.) Vol. 132, 1998, pp. 72-75.
• H₃⁺ in dense and diffuse clouds,
  B. J. McCall, K. H. Hinkle, T. R. Geballe, and T. Oka, Faraday Discuss. 109, 267–280 (1998).
• High-resolution infrared spectroscopy of the J = 1 H₂ pair in parahydrogen crystals,
  Y. Zhang, T. J. Byers, M.-C. Chan, T. Momose, K. E. Kerr, D. P. Weliky, and T. Oka, Phys. Rev. B 58, 218–233 (1998).
• Detection of H₃⁺ in the diffuse interstellar medium toward Cygnus OB2 No. 12,
  B. J. McCall, T. R. Geballe, K. H. Hinkle, and T. Oka, Science 279, 1910–1913 (1998).
• Variation of intermolecular interaction and local lattice distortion of parahydrogen crystals upon vibrational excitation,
  R. M. Dickson and T. Oka, Phys. Rev. B 57, 950–955 (1998).
• High-resolution spectroscopy of the impurity-induced Q₃(0) transition of solid parahydrogen,
  R. M. Dickson, T. Momose, T. J. Byers, and T. Oka, Phys. Rev. B 57, 941–949 (1998).
• Infrared spectroscopic study of rovibrational states of methane trapped in parahydrogen crystal,
  T. Momose, M. Miki, T. Wakabayashi, T. Shida, M.-C. Chan, S. S. Lee, and T. Oka, J. Chem. Phys. 107, 7707–7716 (1997).
• Water on the Sun: molecules everywhere,
  T. Oka, Science 277, 328–329 (1997).
• The infrared spectrum of H₃⁺ in laboratory and space plasmas,
  T. Oka in “Spectroscopy: Perspectives and Frontiers” (A. P. Roy, Ed.), pp. 1–16, Narosa, New Delhi, 1997.
• UKIRT observations of the impact and consequences of Comet Shoemaker-Levy 9 on Jupiter,
  B. M. Dinelli, S. Miller, N. Achilleos, H. A. Lam, M. Cahill, J. Tennyson, M.-F. Jagod, T. Oka, J.-C. Hilico, and T. R. Geballe, Icarus 126, 107–125 (1997).
• Observation of Δ|k-l| = 3 transitions in the ν₃ band of H₃O⁺,
  D. Uy, E. T. White, and T. Oka, J. Mol. Spectrosc. 183, 240–244 (1997).
• Observation of ortho-para H₃⁺ selection rules in plasma chemistry,
  D. Uy, M. Cordonnier, and T. Oka, Phys. Rev. Lett. 78, 3844–3847 (1997).
• Observation of the rotational spectra of ⁴HeH⁺, ⁴HeD⁺, ³HeH⁺, and ³HeD⁺,
  F. Matsushima, T. Oka, and K. Takagi, Phys. Rev. Lett. 78, 1664–1666 (1997).
• High-resolution spectroscopy of solid hydrogen,
  T. Momose and T. Oka, Oyo Buturi 65, 902–911 (1996).
• High-resolution infrared spectroscopy of Q₁(0) transitions in parahydrogen crystals induced by laser radiation field, external electric field, impurity quadrupole field, and the Coulomb field of charges,
  T. Oka, Fiz. Nizk. Temp. (Kiev) 22, 134–139 (1996).
• High-resolution infrared spectroscopy of isotopic impurity Q₁(0) transitions in solid parahydrogen, D. P. Weliky, K. E. Kerr, T. J. Byers, Y. Zhang, T. Momose, and T. Oka, J. Chem. Phys. 105, 4461–4481 (1996).
• Detection of H₃⁺ in interstellar space, T. R. Geballe and T. Oka, Nature 384, 334–335 (1996).
• Infrared spectroscopy of the amidogen ion, NH₂⁺, Y. Kabbadj, T. R. Huet, D. Uy, and T. Oka, J. Mol. Spectrosc. 175, 277–288 (1996).
• Direct measurement of the crystal field splitting of isolated J = 1 impurities in solid parahydrogen,
  R. M. Dickson, T. J. Byers, and T. Oka, J. Low Temp. Phys. 102, 241–247 (1996).
• Infrared spectroscopy of carboions. VIII. Hollow cathode spectroscopy of protonated acetylene, C₂H₃⁺,
  C. M. Gabrys, D. Uy, M.-F. Jagod, T. Oka, and T. Amano, J. Phys. Chem. 99, 15611–15623 (1995).
• On negative inertial defect,
  T. Oka, J. Mol. Struct. 352/353, 225–233 (1995).
• Observation of the S₃(0) transition in solid parahydrogen and a theory of solid-state rovibrational line widths,
  R. M. Dickson and T. Oka, J. Phys. Chem. 99, 2617–2624 (1995).
• Application of laser spectroscopy to fundamental molecular species: H₃⁺ and solid H₂,
  T. Oka, in “Frontiers in Laser Spectroscopy” (Proceedings of the International School of Physics “Enrico Fermi” Course CXX) (T. W. Hänsch and M. Inguscio, Eds.), pp. 61–87, North Holland, New York, 1994.
• Infrared spectrum of CH₃⁺ involving high rovibrational levels,
  M. F. Jagod, C. M. Gabrys, M. Rösslein, D. Uy, and T. Oka, Can. J. Phys. 72, 1192–1199 (1994).
• Condon modulation spectroscopy of solid hydrogen and measurement of the temperature dependence of the Q₁(0) transition,
  K. E. Kerr, T. Momose, D. P. Weliky, C. M. Gabrys, and T. Oka, Phys. Rev. Lett. 72, 3957–3960 (1994).
• Charge-induced H₂ spectrum in γ-ray irradiated para-H₂ crystals,
  T. Momose, K. E. Kerr, D. P. Weliky, C. M. Gabrys, R. M. Dickson, and T. Oka, J. Chem. Phys. 100, 7840–7843 (1994).
• Spectral lines and distribution of H₃⁺ in high rotational levels,
  D. Uy, C. M. Gabrys, M.-F. Jagod, and T. Oka, J. Chem. Phys. 100, 6267–6274 (1994).
• Near infrared 3ν₂ overtone band of H₃⁺,
  B. F. Ventrudo, D. T. Cassidy, Z. Y. Guo, S. Joo, S. S. Lee, and T. Oka, J. Chem. Phys. 100, 6263–6266 (1994).
• High-resolution laser spectroscopy of the Q_v(0) transitions in solid parahydrogen,
  D. P. Weliky, T. J. Byers, K. E. Kerr, T. Momose, R. M. Dickson, and T. Oka, Appl. Phys. B 59, 265–281 (1994).
• The ν₂ + ν₃ - ν₂ band of NH₃⁺,
  T. R. Huet, Y. Kabbadj, C. M. Gabrys, and T. Oka, J. Mol. Spectrosc. 163, 206–213 (1994).
• Infrared spectroscopy of highly excited vibrational levels of protonated nitrogen, HN₂⁺,
  Y. Kabbadj, T. R. Huet, B. D. Rehfuss, C. M. Gabrys, and T. Oka, J. Mol. Spectrosc. 163, 180–205 (1994).
• High-resolution spectroscopy of solid hydrogen,
  T. Oka, Annu. Rev. Phys. Chem. 44, 299–333 (1993).
• Detection of H₃⁺ infrared emission lines in Saturn,
  T. R. Geballe, M.-F. Jagod, and T. Oka, Astrophys. J. 408, L109–L112 (1993).
• Infrared spectrum of H₃⁺ as an astronomical probe,
  T. Oka and M.-F. Jagod, J. Chem. Soc., Faraday Trans. 89, 2147–2154 (1993).
• Infrared spectroscopy of carbo-ions. VI. C–H stretching vibration of the acetylene ion C₂H₂⁺ and isotopic species,
  M.-F. Jagod, M. Rösslein, C. M. Gabrys, B. D. Rehfuss, F. Scappini, M. W. Crofton, and T. Oka, J. Chem. Phys. 97, 7111–7123 (1992).
• Infrared spectroscopy and equilibrium structure of H₂O⁺ (X ²B₁),
  T. R. Huet, C. J. Pursell, W. C. Ho, B. M. Dinelli, and T. Oka, J. Chem. Phys. 97, 5977–5987 (1992).
• The infrared spectrum of H₃⁺ in laboratory and space plasmas,
  T. Oka, Rev. Mod. Phys. 64, 1141–1149 (1992).
• The stimulated Raman gain spectrum of the Q_1←0(0) transition of solid parahydrogen,
  T. Momose, D. P. Weliky, and T. Oka, J. Mol. Spectrosc. 153, 760–761 (1992).
• Detection of the infrared spectrum of CH₂⁺,
  M. Rösslein, C. M. Gabrys, M.-F. Jagod, and T. Oka, J. Mol. Spectrosc. 153, 738–740 (1992).
• Observation of infrared forbidden transitions of H₃⁺,
  L.-W. Xu, M. Rösslein, C. M. Gabrys, and T. Oka, J. Mol. Spectrosc. 153, 726–737 (1992).
• Infrared spectroscopy of carbo-ions: the ν₁ and ν₄ bands of CH₂D⁺, and the ν₁ band of CHD₂⁺,
  M.-F. Jagod, M. Rösslein, C. M. Gabrys, and T. Oka, J. Mol. Spectrosc. 153, 666–679 (1992).
• Infrared spectroscopy of highly excited vibrational levels of the hydroxyl ion, OH⁺,
  B. D. Rehfuss, M.-F. Jagod, L.-W. Xu, and T. Oka, J. Mol. Spectrosc. 151, 59–70 (1992).
• High resolution infrared spectroscopy of deuterium in p-H₂ matrix,
  M.-C. Chan, L.-W. Xu, C. M. Gabrys, and T. Oka, J. Chem. Phys. 95, 9404–9407 (1991).
• Laboratory infrared spectra of CH₂D⁺ and HCCD⁺ and predicted microwave transitions,
  M. Rösslein, M.-F. Jagod, C. M. Gabrys, and T. Oka, Astrophys. J. 382, L51–L53 (1991).
• Infrared spectroscopy in a H₂-O₂-He discharge: H₃O⁺,
  W. C. Ho, C. J. Pursell, and T. Oka, J. Mol. Spectrosc. 149, 530–541 (1991).
• Laser spectroscopic studies of the pure rotational U₀(0) and W₀(0) transitions of solid parahydrogen,
  M.-C. Chan, S. S. Lee, M. Okumura, and T. Oka, J. Chem. Phys. 95, 88–97 (1991). (erratum)
• A table of astronomically important ro-vibrational transitions for the H₃⁺ molecular ion,
  L. Kao, T. Oka, S. Miller, J. Tennyson, Astrophys. J. Suppl. Ser. 77, 317–329 (1991).
• High-resolution infrared spectroscopy of solid hydrogen,
  M.-C. Chan, M. Okumura, C. M. Gabrys, L.-W. Xu, B. D. Rehfuss, and T. Oka, Phys. Rev. Lett. 66, 2060–2063 (1991). (erratum)
• Observation of the 3ν₂ ← 0 overtone band of H₃⁺,
  S. S. Lee, B. F. Ventrudo, D. T. Cassidy, T. Oka, S. Miller, and J. Tennyson, J. Mol. Spectrosc. 145, 222–224 (1991).
• Diode laser spectroscopy of the ν₂ fundamental and hot bands of NH₃⁺,
  S. S. Lee and T. Oka, J. Chem. Phys. 94, 1698–1704 (1991).
• Collision-induced double resonance studies of HN₂⁺ and HCN,
  C. J. Pursell, D. P. Weliky, and T. Oka, J. Chem. Phys. 93, 7041–7048 (1990).
• Observation of the 2ν₂(l = 2) ← 0 overtone band of H₃⁺,
  L.-W. Xu, C. Gabrys, and T. Oka, J. Chem. Phys. 93, 6210–6215 (1990).
• Laboratory observation of hot bands of H₃⁺,
  M. G. Bawendi, B. D. Rehfuss, and T. Oka, J. Chem. Phys. 93, 6200–6209 (1990).
• Observation of the U_1←0(1) transition of solid deuterium,
  M.-C. Chan and T. Oka, J. Chem. Phys. 93, 979–982 (1990).
• Infrared-microwave double resonance spectroscopy of molecular ions: HN₂⁺,
  W. C. Ho, C. J. Pursell, D. P. Weliky, K. Takagi, and T. Oka, J. Chem. Phys. 93, 87–93 (1990).
• Observations of the 4 micron fundamental band of H₃⁺ in Jupiter,
  T. Oka and T. R. Geballe, Astrophys. J. 351, L53–L56 (1990).
• Inertial defects of planar symmetric top molecules,
  M.-F. Jagod and T. Oka, J. Mol. Spectrosc. 139, 313–327 (1990).
• Observation of direct and collision-induced double resonance of a molecular ion,
  C. J. Pursell, D. P. Weliky, W. C. Ho, K. Takagi, and T. Oka, J. Chem. Phys. 91, 7997–7999 (1989).
• Infrared spectra of ⁴HeH⁺, ⁴HeD⁺, ³HeH⁺, and ³HeD⁺,
  M. W. Crofton, R. S. Altman, N. N. Haese, and T. Oka, J. Chem. Phys. 91, 5882–5886 (1989).
• Infrared spectroscopy of carbo-ions. V. Classical vs. nonclassical structure of protonated acetylene C₂H₃⁺,
  M. W. Crofton, M.-F. Jagod, B. D. Rehfuss, and T. Oka, J. Chem. Phys. 91, 5139–5153 (1989).
• An infrared spectroscopic search for the molecular ion H₃⁺,
  T. R. Geballe and T. Oka, Astrophys. J. 342, 855–859 (1989).
• Difference frequency laser spectroscopy of the ν₃ fundamental band of NH₂⁺,
  M. Okumura, B. D. Rehfuss, B. M. Dinelli, M. G. Bawendi, and T. Oka, J. Chem. Phys. 90, 5918–5923 (1989).
• Observation and analysis of the ν₃ band of NH₃⁺,
  M. G. Bawendi, B. D. Rehfuss, B. M. Dinelli, M. Okumura, and T. Oka, J. Chem. Phys. 90, 5910–5917 (1989).
• On the anomalous A₁-A₂ splittings in the ν₂–ν₄ manifold of PH₃,
  Y.-T. Chen and T. Oka, J. Mol. Spectrosc. 133, 148–156 (1989).
• High-resolution infrared spectroscopy of solid hydrogen: The tetrahexacontapole-induced ΔJ=6 transitions,
  M. Okumura, M.-C. Chan, and T. Oka, Phys. Rev. Lett. 62, 32–35 (1989).
• Infrared-radiofrequency double resonance spectroscopy of CH₃F using a color center laser,
  C. Pursell, W. C. Ho, F. Scappini, and T. Oka, J. Mol. Spectrosc. 131, 241–249 (1988).
• Infrared spectroscopy of molecular ions,
  T. Oka, in “Structure of Small Molecules and Ions” (R. Naaman and Z. Vager, Eds.), pp. 77–86, Plenum, New York, 1988.
• The ν₂ 1^- ← 0⁺ band of H₃¹⁸O⁺,
  N. N. Haese, D.-J. Liu, and T. Oka, J. Mol. Spectrosc. 130, 262–263 (1988).
• Infrared spectroscopy of carbo-ions. IV. The A²Π_u-X²Σ_g⁺ electronic transition of C₂^-,
  B. D. Rehfuss, D.-J. Liu, B. M. Dinelli, M.-F. Jagod, W. C. Ho, M. W. Crofton, and T. Oka, J. Chem. Phys. 89, 129–137 (1988).
• Stark and Zeeman effects in ethylene observed by sub-Doppler infrared spectroscopy, Y.-T. Chen and T. Oka, J. Chem. Phys. 88, 5282–5290 (1988).
• Infrared spectroscopy of molecular ions,
  T. Oka in “Frontiers of Laser Spectroscopy of Gases” (A. C. P. Alves, J. M. Brown, and J. M. Hollas, Eds.), pp. 353-377, Kluwer Academic, Norwell, MA, 1988.
• The ν₃ fundamental band of HCNH⁺ and the 2ν₃ ← ν₃ and ν₂ + ν₃ ← ν₂ hot bands of HCO⁺,
  D.-J. Liu, S.-T. Lee, and T. Oka, J. Mol. Spectrosc. 128, 236–249 (1988).
• Infrared spectroscopy of the ν₃ band of H₂O⁺,
  B. M. Dinelli, M. W. Crofton, and T. Oka, J. Mol. Spectrosc. 127, 1–11 (1988).
• Infrared spectroscopy of carbo-ions, T. Oka, Philos. Trans. R. Soc. London, Ser. A 324, 81–95 (1988).
• Infrared spectroscopy of carbo-ions. III. ν₃ band of methyl cation CH₃⁺,
  M. W. Crofton, M.- F. Jagod, B. D. Rehfuss, W. A. Kreiner, and T. Oka, J. Chem. Phys. 88, 666–678 (1988).
• Vibration-induced first-order Stark effect in tetrahedral molecules: SiH₄ and SiF₄,
  J. M. Frye, G. Magerl, W. A. Kreiner, and T. Oka, J. Chem. Phys. 88, 730–737 (1987).
• Infrared molecular spectroscopy using frequency tunable lasers,
  T. Oka, Hyperfine Interac. 38, 653–670 (1987).
• Vibrationally induced nuclear quadrupole coupling in the v₃ = 1 state of ¹⁸⁹OsO₄,
  F. Scappini, W. A. Kreiner, J. M. Frye, and T. Oka, J. Chem. Phys. 87, 5644–5648 (1987).
• Rotational spectroscopy of molecular ions using diode lasers,
  D.-J. Liu, W.-C. Ho, and T. Oka, J. Chem. Phys. 87, 2442–2446 (1987).
• Radial distribution of molecular ions in the positive column of dc glow discharges using infrared diode-laser spectroscopy,
  F.-S. Pan and T. Oka, Phys. Rev. A 36, 2297–2310 (1987).
• Extraordinary molecules in interstellar space,
  T. Oka, in “Atomic Physics 10” (H. Narumi and I. Shimamura, Eds.), pp. 439-443, Elsevier, Amsterdam, 1987.
• Observation of forbidden transitions of ammonium ion (NH₄⁺) Π₃ band and determination of ground state rotational constants. Observation of ν₃ band allowed transitions of ND₄⁺, M. W. Crofton and T. Oka, J. Chem. Phys. 86, 5983–5988 (1987).
• Infrared spectra of carboions. II. ν₃ band of acetylene ion C₂H₂⁺ (²Π_u),
  M. W. Crofton, M.- F. Jagod, B. D. Rehfuss, and T. Oka, J. Chem. Phys. 86, 3755–3756 (1987).
• The infrared ν₅ band (HNC bend) of protonated hydrogen cyanide, HCNH⁺,
  W.-C. Ho, C. E. Blom, D.-J. Liu, and T. Oka, J. Mol. Spectrosc. 123, 251–253 (1987).
• Dicke narrowing and pressure broadening in the infrared fundamental band of HCl perturbed by Ar,
  D. R. Rao and T. Oka, J. Mol. Spectrosc. 122, 16–27 (1987).
• Observation of ground state rotational transitions in silicon tetrafluoride,
  L. Jörissen, W. A. Kreiner, Y.-T. Chen, T. Oka, J. Mol. Spectrosc. 120, 233–235 (1986).
• Infrared spectrum of the fundamental vibration-rotation band of OD^-,
  B. D. Rehfuss, M. W. Crofton, and T. Oka, J. Chem. Phys. 85, 1785–1788 (1986).
• Infrared spectroscopy of molecular ions,
  T. Oka, NBS. Spec. Publ. 716 (Proceedings of the Seventeenth International Symposium on Free Radicals), 540–546 (1986).
• Sub-Doppler spectroscopy using a multiple-reflection mirror system,
  Y.-T. Chen, J. M. Frye, and T. Oka, J. Opt. Soc. Am. B 3, 935–939 (1986).
• Calculated forbidden rotational spectra of H₃⁺,
  F.-S. Pan and T. Oka, Astrophys. J. 305, 518–525 (1986).
• Observation of the rotational spectrum of OH^-,
  D.-J. Liu and T. Oka, J. Chem. Phys. 84, 2426–2427 (1986).
• The calculated ν₂ (inversion) spectrum of H₃O⁺,
  D.-J. Liu, T. Oka, and T. J. Sears, J. Chem. Phys. 84, 1312–1316 (1986).
• Observation and analysis of the ν₂ and ν₃ fundamental bands of the H₂D⁺ ion,
  S. C. Foster, A. R. W. McKellar, I. R. Peterkin, J. K. G. Watson, F. S. Pan, M. W. Crofton, R. S. Altman, and T. Oka, J. Chem. Phys. 84, 91–99 (1986).
• Observation of the infrared spectrum of methyl cation CH₃⁺,
  M. W. Crofton, W. A. Kreiner, M.-F. Jagod, B. D. Rehfuss, and T. Oka, J. Chem. Phys. 83, 3702–3703 (1985).
• Infrared spectrum of the fundamental vibration-rotation band of ³Σ^- OH⁺,
  M. W. Crofton, R. S. Altman, M.-F. Jagod, and T. Oka, J. Phys. Chem. 89, 3614–3617 (1985).
• Infrared spectrum of the ν₂ vibration-inversion band of H₃O⁺,
  D.-J. Liu, N. N. Haese, and T. Oka, J. Chem. Phys. 82, 5368–5372 (1985).
• Experimental determination of the ground-state inversion splitting in H₃O⁺,
  D.-J. Liu and T. Oka, Phys. Rev. Lett. 54, 1787–1789 (1985).
• The infrared spectrum of the ν₂ fundamental band of the H₃⁺ molecular ion,
  J. K. G. Watson, S. C. Foster, A. R. W. McKellar, P. Bernath, T. Amano, F. S. Pan, M. W. Crofton, R. S. Altman, and T. Oka, Can. J. Phys. 62, 1875–1885 (1984).
• High resolution infrared spectroscopy of the ν₁ (NH stretch) and ν₂ (CH stretch) bands of HCNH⁺,
  R. S. Altman, M. W. Crofton, and T. Oka, J. Chem. Phys. 81, 4255–4258 (1984).
• Sub-Doppler spectroscopy of the ν₂ band of NH₃ using microwave modulation sidebands of CO₂ laser lines,
  G. Magerl, W. Schupita, J. M. Frye, W. A. Kreiner, and T. Oka, J. Mol. Spectrosc. 107, 72–83 (1984).
• Radiofrequency-infrared double-resonance spectroscopy of OsO₄ using microwave modulation sidebands on CO₂ laser lines,
  F. Scappini, W. A. Kreiner, J. M. Frye, and T. Oka, J. Mol. Spectrosc. 106, 436–440 (1984).
• Observation of the infrared ν₂ (CH stretch) of protonated hydrogen cyanide, HCNH⁺,
  R. S. Altman, M. W. Crofton, and T. Oka, J. Chem. Phys. 80, 3911–3912 (1984).
• Observation of the ν₂ (1^- ←  0⁺) inversion mode band in H₃O⁺ by high resolution infrared spectroscopy,
  N. N. Haese and T. Oka, J. Chem. Phys. 80, 572–573 (1984).
• Infrared studies of molecular ions. I. The ν₃ band of NH₄⁺,
  M. W. Crofton and T. Oka, J. Chem. Phys. 79, 3157–3158 (1983).
• Lamb dip spectroscopy using tunable laser sidebands,
  G. Magerl, J. M. Frye, W. A. Kreiner, and T. Oka, in “Laser Spectroscopy VI” (H. P. Weber and W. Luthy, Eds.), pp. 430–431, Springer-Verlag, New York, 1983.
• Doppler shift ion mobility measurements of ArH⁺ in a He dc glow discharge by diode laser spectroscopy,
  N. N. Haese and T. Oka, Proc. SPIE (Tunable Diode Laser Dev. Spectrosc. Appl.) 438, 165–169 (1983).
• Collision-induced resonances in radio-frequency spectroscopy inside the cavity of an infrared laser,
  P. Glorieux, E. Arimondo, and T. Oka, J. Phys. Chem. 87, 2133–2141 (1983).
• Doppler shift and ion mobility measurements of ArH⁺ in a He dc glow discharge by infrared laser spectroscopy,
  N. N. Haese, F.-S. Pan, and T. Oka, Phys. Rev. Lett. 50, 1575–1578 (1983).
• Inverse Lamb dip spectroscopy using microwave modulation sidebands of CO₂ laser lines,
  G. Magerl, J. M. Frye, W. A. Kreiner, and T. Oka, Appl. Phys. Lett. 42, 656–658 (1983).
• The H₃⁺ ion,
  T. Oka, in “Molecular Ions: Spectroscopy, Structure, and Chemistry” (T. A. Miller and V. E. Bondybey, Eds.), pp. 73–90, North Holland, New York, 1983.
• Microwave studies of collision-induced transitions between rotational levels. VIII. Collisions between NH₃ and polar molecules,
  A. R. Fabris and T. Oka, J. Chem. Phys. 78, 3462–3466 (1983).
• Intracavity infrared-microwave double-resonance spectroscopy,
  T. Oka, Philos. Trans. R. Soc. London, Ser. A 307, 591–601 (1982).
• Study of microwave transitions in intracavity absorbers with the use of off-resonant response of infrared lasers,
  E. Arimondo and T. Oka, Phys. Rev. A 26, 1494–1504 (1982).
• On the n-dependence of the reaction rate for C⁺ + C_n ! C⁺_n+1 in interstellar space,
  K. F. Freed, T. Oka, and H. Suzuki, Astrophys. J. 263, 718–722 (1982).
• Laser stark spectroscopy of methyl cyanide in the 10-μm region: Analysis of the ν₄ and ν₇ bands, and the ν₇, 3ν₈¹ interaction,
  S. A. Rackley, R. J. Butcher, M. Römheld, S. M. Freund, and T. Oka, J. Mol. Spectrosc. 92, 203–217 (1982).
• A search for interstellar H₃⁺,
  T. Oka, Philos. Trans. R. Soc. London, Ser. A 303, 543–549 (1981).
• Radiofrequency spectroscopy of AsH₃ inside a CO₂-NO₂ laser cavity,
  F. Scappini and T. Oka, J. Mol. Spectrosc. 85, 390–398 (1981).
• The infrared spectrum of H₃⁺,
  T. Oka, in “Laser Spectroscopy V” (A. R. W. McKellar, T. Oka, and B. P. Stoicheff, Eds.), pp. 320–323, Springer-Verlag, New York, 1981.
• Vibrationally induced nuclear quadrupole coupling in tetrahedral and octahedral molecules,
  J. T. Hougen and T. Oka, J. Chem. Phys. 74, 1830–1839 (1981).
• Observation of the infrared spectrum of H₃⁺,
  T. Oka, Phys. Rev. Lett. 45, 531–534 (1980).

Prospecti

• The Study of the C₆₀⁺ Cation in a Supersonic Slit Jet Using Cavity Ring Down Spectroscopy,
  Christopher P. Morong, Doctoral Candidacy Prospectus, (The University of Chicago, October 2003).
• High-Resolution Near-Infrared Spectroscopy of H₃⁺ Above the Barrier to Linearity,
  Jennifer Gottfried, Doctoral Candidacy Prospectus, (The University of Chicago, October 2001).
• The High-Resolution Infrared Spectroscopy of the Cyclopropenyl Cation,
  Christopher F. Neese, Doctoral Candidacy Prospectus, (The University of Chicago, October 2000).
• Color Center Laser Spectroscopy of the Primary Ions in a Slit Jet Discharge,
  C. Michael Lindsay, Doctoral Candidacy Prospectus, (The University of Chicago, October 1997).
• Laboratory and Observational Spectroscopy of H₃⁺,
  Benjamin J. McCall, Doctoral Candidacy Prospectus, (The University of Chicago, October 1996).

Dissertations

• Near-Infrared Spectroscopy of H₃⁺ and CH₂⁺,                                        Jennifer L. Gottfried,  Doctoral Thesis, (The University of Chicago, August 2005).
• Highly Sensitive Visible Laser Spectroscopy of Ions and Radicals in Plasmas,
  Christopher G. Tarsitano, Doctoral Thesis, (The University of Chicago, August 2004).
• Highly-Sensitive and Efficient Infrared Spectroscopy of Molecular Ions,
  C. Michael Lindsay, Doctoral Thesis, (The University of Chicago, May 2002).
• Spectroscopy of H₃⁺ in Laboratory and Astrophysical Plasmas,
  Benjamin J. McCall, Doctoral Thesis, (The University of Chicago, June 2001).
• High Resolution Infrared Laser Spectroscopy of CH₅⁺,
  Edmund T. White, Doctoral Thesis, (The University of Chicago, August 1999).
• High-Resolution Laser Infrared Spectroscopy of Orthohydrogren Impurity Pair in solid Parahydrogen and of γ-ray Irradiated Solid Parahydrogen,
  Yu Zhang, Doctoral Thesis, (The University of Chicago, June 1998).

Other

• The Story of Spin, translated by Takeshi Oka.
• Oka's complete list of publications from his CV (Including publications before 1980).

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