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Altman, R.S.; Crofton, M.W.; Oka, T., Observation of the infrared ν2 band (CH stretch) of protonated hydrogen cyanide HCNH+, J. Chem. Phys., 1984, 80, 8, 3911, https://doi.org/10.1063/1.447173 . [all data]

Altman, R.S.; Crofton, M.W.; Oka, T., High resolution infrared spectroscopy of the ν1 (NH stretch) and ν2 (CH stretch) bands of HCNH+, J. Chem. Phys., 1984, 81, 10, 4255, https://doi.org/10.1063/1.447433 . [all data]

Bawendi, M.G.; Rehfuss, B.D.; Dinelli, B.M.; Okumura, M.; Oka, T., Observation and analysis of the ν3 band of NH+3, J. Chem. Phys., 1989, 90, 11, 5910, https://doi.org/10.1063/1.456356 . [all data]

Bawendi, M.G.; Rehfuss, B.D.; Oka, T., Laboratory observation of hot bands of H+3, J. Chem. Phys., 1990, 93, 9, 6200, https://doi.org/10.1063/1.458989 . [all data]

Crofton, M.W.; Jagod, M.-F.; Rehfuss, B.D.; Oka, T., Infrared spectra of carboions. II. ν3 band of acetylene ion C2H+2(2Πu), J. Chem. Phys., 1987, 86, 6, 3755, https://doi.org/10.1063/1.451929 . [all data]

Crofton, M.W.; Jagod, M.-F.; Rehfuss, B.D.; Kreiner, W.A.; Oka, T., Infrared spectroscopy of carbo-ions. III. ν3 band of methyl cation CH+3, J. Chem. Phys., 1988, 88, 2, 666, https://doi.org/10.1063/1.454194 . [all data]

Crofton, M.W.; Jagod, M.-F.; Rehfuss, B.D.; Oka, T., Infrared spectroscopy of carbo-ions. V. Classical vs nonclassical structure of protonated acetylene C2H+3, J. Chem. Phys., 1989, 91, 9, 5139, https://doi.org/10.1063/1.457612 . [all data]

Crofton, M.W.; Kreiner, W.A.; Jagod, M.-F.; Rehfuss, G.D.; Oka, T., Observation of the infrared spectrum of methyl cation CH+3, J. Chem. Phys., 1985, 83, 7, 3702, https://doi.org/10.1063/1.449125 . [all data]

Crofton, M.; Oka, T., Infrared studies of molecular ions. I. The ν3 band of NH4+, J. Chem. Phys., 1983, 79, 6, 3157, https://doi.org/10.1063/1.446147 . [all data]

Crofton, M.W.; Oka, T., Observation of forbidden transitions of ammonium ion (NH+4) ν3 band and determination of ground state rotational constants. Observation of ν3 band allowed transitions of ND+4, J. Chem. Phys., 1987, 86, 11, 5983, https://doi.org/10.1063/1.452484 . [all data]

Chan, M.-C.; Okumura, M.; Oka, T., Infrared Spectrum of, J. Phys. Chem. A, 2000, 104, 16, 3775, https://doi.org/10.1021/jp993890h . [all data]

Dinelli, B.M.; Crofton, M.W.; Oka, T., Infrared spectroscopy of the ν3 band of H2O+, J. Mol. Spectrosc., 1988, 127, 1, 1, https://doi.org/10.1016/0022-2852(88)90003-3 . [all data]

Foster, S.C.; McKellar, A.R.W.; Peterkin, I.R.; Watson, J.K.G.; Pan, F.S.; Crofton, M.W.; Altman, R.S.; Oka, T., Observation and analysis of the ν2 and ν3 fundamental bands of the H2D+ ion, J. Chem. Phys., 1986, 84, 1, 91, https://doi.org/10.1063/1.450137 . [all data]

Gottfried, J.L.; Oka, T., Near-infrared electronic spectrum of CH[sub 2][sup +], J. Chem. Phys., 2004, 121, 23, 11527, https://doi.org/10.1063/1.1835265 . [all data]

Gabrys, C.M.; Uy, D.; Jagod, M.-F.; Oka, T.; Amano, T., Infrared Spectroscopy of Carboions. 8. Hollow Cathode Spectroscopy of Protonated Acetylene, C2H3+, J. Phys. Chem., 1995, 99, 42, 15611, https://doi.org/10.1021/j100042a042 . [all data]

Ho, W.-C.; Blom, C.E.; Liu, D.-J.; Oka, T., The infrared ν5 band (HNC bend) of protonated hydrogen cyanide, HCNH+, J. Mol. Spectrosc., 1987, 123, 1, 251, https://doi.org/10.1016/0022-2852(87)90275-X . [all data]

Huet, T.R.; Pursell, C.J.; Ho, W.C.; Dinelli, B.M.; Oka, T., Infrared spectroscopy and equilibrium structure of H2O+(X 2B1), J. Chem. Phys., 1992, 97, 9, 5977, https://doi.org/10.1063/1.463735 . [all data]

Ho, W.C.; Pursell, C.J.; Oka, T., Infrared spectroscopy in an H2«58872»O2«58872»He discharge: H3O+, J. Mol. Spectrosc., 1991, 149, 2, 530, https://doi.org/10.1016/0022-2852(91)90308-W . [all data]

Ho, W.C.; Pursell, C.J.; Weliky, D.P.; Takagi, K.; Oka, T., Infrared--microwave double resonance spectroscopy of molecular ions: HN+2, J. Chem. Phys., 1990, 93, 1, 87, https://doi.org/10.1063/1.459466 . [all data]

Jagod, M.-F.; Gabrys, C.M.; Rosslein, M.; Uy, D.; Oka, T., Infrared spectrum of CH, Can. J. Phys., 1994, 72, 11-12, 1192, https://doi.org/10.1139/p94-153 . [all data]

Haese, N.N.; Oka, T., Observation of the ν2 (1-←0+) inversion mode band in H3O+ by high resolution infrared spectroscopy, J. Chem. Phys., 1984, 80, 1, 572, https://doi.org/10.1063/1.446436 . [all data]

Jagod, M.-F.; Rosslein, M.; Gabrys, C.M.; Rehfuss, B.D.; Scappini, F.; Crofton, M.W.; Oka, T., Infrared spectroscopy of carbo-ions. VI. C--H stretching vibration of the acetylene ion C2H2+ and isotopic species, J. Chem. Phys., 1992, 97, 10, 7111, https://doi.org/10.1063/1.463536 . [all data]

Kabbadj, Y.; Huet, T.R.; Uy, D.; Oka, T., Infrared Spectroscopy of the Amidogen Ion, NH+2, J. Mol. Spectrosc., 1996, 175, 2, 277, https://doi.org/10.1006/jmsp.1996.0033 . [all data]

Liu, D.-J.; Haese, N.N.; Oka, T., Infrared spectrum of the ν2 vibration-inversion band of H3O+, J. Chem. Phys., 1985, 82, 12, 5368, https://doi.org/10.1063/1.448620 . [all data]

Liu, D.-J.; Lee, S.-T.; Oka, T., The ν3 fundamental band of HCNH+ and the 2ν3 ← ν3 and ν2 + ν3 ← ν2 hot bands of HCO+, J. Mol. Spectrosc., 1988, 128, 1, 236, https://doi.org/10.1016/0022-2852(88)90221-4 . [all data]

Landsberg, B.M.; Merer, A.J.; Oka, T., Infrared spectroscopy of short-lived molecules, J. Mol. Spectrosc., 1977, 67, 1-3, 459, https://doi.org/10.1016/0022-2852(77)90052-2 . [all data]

Liu, D.-J.; Oka, T., Experimental Determination of the Ground-State Inversion Splitting in H_{3}O^{+}, Phys. Rev. Lett., 1985, 54, 16, 1787, https://doi.org/10.1103/PhysRevLett.54.1787 . [all data]

Lee, S.S.; Oka, T., Diode laser spectroscopy of the ν2 fundamental and hot bands of NH+3, J. Chem. Phys., 1991, 94, 3, 1698, https://doi.org/10.1063/1.459941 . [all data]

Liu, D.-J.; Oka, T.; Sears, T.J., The calculated ν2 (inversion) spectrum of H3O+, J. Chem. Phys., 1986, 84, 3, 1312, https://doi.org/10.1063/1.450522 . [all data]

Lee, S.S.; Ventrudo, B.F.; Cassidy, D.T.; Oka, T.; Miller, S.; Tennyson, J., Observation of the 3ν2 ← 0 overtone band of H3+, J. Mol. Spectrosc., 1991, 145, 1, 222, https://doi.org/10.1016/0022-2852(91)90365-H . [all data]

Oka, T., Observation of the Infrared Spectrum of H_{3}^{+}, Phys. Rev. Lett., 1980, 45, 7, 531, https://doi.org/10.1103/PhysRevLett.45.531 . [all data]

Oka, T., Infrared Spectroscopy of Carbo-Ions [and Discussion], Phil. Trans. Roy. Soc. (London) A324, 1988, 324, 1578, 81, https://doi.org/10.1098/rsta.1988.0002 . [all data]

Okumura, M.; Rehfuss, B.D.; Dinelli, B.M.; Bawendi, M.G.; Oka, T., Difference frequency laser spectroscopy of the ν3 fundamental band of NH+2, J. Chem. Phys., 1989, 90, 11, 5918, https://doi.org/10.1063/1.456357 . [all data]

Rosslein, M.; Gabrys, C.M.; Jagod, M.-F.; Oka, T., Detection of the infrared spectrum of CH2+, J. Mol. Spectrosc., 1992, 153, 1-2, 738, https://doi.org/10.1016/0022-2852(92)90508-L . [all data]

Tang, J.; Oka, T., Infrared Spectroscopy of H3O+: The ν1 Fundamental Band, J. Mol. Spectrosc., 1999, 196, 1, 120, https://doi.org/10.1006/jmsp.1999.7844 . [all data]

Uy, D.; White, E.T.; Oka, T., Observation of Δ|k - l| = 3 Transitions in the ν3Band of H3O+, J. Mol. Spectrosc., 1997, 183, 2, 240, https://doi.org/10.1006/jmsp.1997.7270 . [all data]

Ventrudo, B.F.; Cassidy, D.T.; Guo, Z.Y.; Joo, S.; Lee, S.S.; Oka, T., Near infrared 3ν2 overtone band of H+3, J. Chem. Phys., 1994, 100, 9, 6162, https://doi.org/10.1063/1.467088 . [all data]

Watson, J.K.G.; Foster, S.C.; McKellar, A.R.W.; Bernath, P.; Amano, T.; Pan, F.S.; Crofton, M.W.; Altman, R.S.; Oka, T., The infrared spectrum of the ν, Can. J. Phys., 1984, 62, 12, 1875, https://doi.org/10.1139/p84-231 . [all data]

White, E.T.; Tang, J.; Oka, T., CH5+: The Infrared Spectrum Observed, Science, 1999, 284, 5411, 135, https://doi.org/10.1126/science.284.5411.135 . [all data]

Xu, L.-W.; Gabrys, C.; Oka, T., Observation of the 2ν2(l=2)←0 overtone band of H+3, J. Chem. Phys., 1990, 93, 9, 6210, https://doi.org/10.1063/1.458990 . [all data]

Xu, L.-W.; Rosslein, M.; Gabrys, C.M.; Oka, T., Observation of infrared forbidden transitions of H3+, J. Mol. Spectrosc., 1992, 153, 1-2, 726, https://doi.org/10.1016/0022-2852(92)90507-K . [all data]

Oka, T.; Rao, K.V.S.R.; Redpath, J.L.; Firestone, R.F., Mechanism for decay and spontaneous radiative decay constants of the lowest-lying attractive excited states of Ne₂, Ar₂, and Kr₂, J. Chem. Phys., 1974, 61, 4740. [all data]

Arai, S.; Oka, T.; Kogoma, M.; Imamura, M., Near infrared absorptions of neon, argon, krypton, and xenon excited diatomic molecules, J. Chem. Phys., 1978, 68, 4595-4603. [all data]

McKellar, A.R.W.; Oka, T., A study of the electric quadrupole fundamental band of D₂ using an infrared difference frequency laser system, Can. J. Phys., 1978, 56, 1315-1320. [all data]

Oka, T.; Kogoma, M.; Imamura, M.; Arai, S.; Watanabe, T., Energy transfer of argon excited diatomic molecules, J. Chem. Phys., 1979, 70, 3384-3389. [all data]

Takao, S.; Kogoma, M.; Oka, T.; Imamura, M.; Arai, S., Optical absorption spectra and kinetic behavior of helium excited diatomic molecule (a³Σ_u⁺), J. Chem. Phys., 1980, 73, 148-155. [all data]

Haese, N.N.; Pan, F.-S.; Oka, T., Doppler shift and ion mobility measurements of ArH⁺ in a He dc glow discharge by infrared laser spectroscopy, Phys. Rev. Lett., 1983, 50, 1575-1578. [all data]

Crofton, M.W.; Altman, R.S.; Jagod, M.-F.; Oka, T., Infrared spectrum of the fundamental vibration-rotation band of ³Σ^- OH⁺, J. Phys. Chem., 1985, 89, 3614-3617. [all data]

Liu, D.-J.; Oka, T., Observation of the rotational spectrum of OH^-, J. Chem. Phys., 1986, 84, 2426-2427. [all data]

Rehfuss, B.D.; Crofton, M.W.; Oka, T., Infrared spectrum of the fundamental vibration-rotation band of OD^-, J. Chem. Phys., 1986, 85, 1785-1788. [all data]

Liu, D.-J.; Ho, W.-C.; Oka, T., Rotational spectroscopy of molecular ions using diode lasers, J. Chem. Phys., 1987, 87, 2442-2446. [all data]

Pan, F.; Oka, T., Radial distribution of molecular ions in the positive column of dc glow discharges using infrared diode-laser spectroscopy, Phys. Rev. A: Gen. Phys., 1987, 36, 2297-2310. [all data]

Rao, D.R.; Oka, T., Dicke narrowing and pressure broadening in the infrared fundamental band of HCl perturbed by Ar, J. Mol. Spectrosc., 1987, 122, 16-27. [all data]

Rehfuss, B.D.; Liu, D.-J.; Dinelli, B.M.; Jagod, M.-F.; Ho, W.C.; Crofton, M.W.; Oka, T., Infrared spectroscopy of carbo-ions. IV. The A²Π_u-X²Σ_g⁺ electronic transition of C₂^-, J. Chem. Phys., 1988, 89, 129-137. [all data]

Crofton, M.W.; Altman, R.S.; Haese, N.N.; Oka, T., Infrared spectra of ⁴HeH⁺, ⁴HeD⁺, ³HeH⁺, and ³HeD⁺, J. Chem. Phys., 1989, 91, 5882-5886. [all data]

Chan, M.-C.; Oka, T., Observation of the U_1←0 (1) transition of solid deuterium, J. Chem. Phys., 1990, 93, 979-982. [all data]

Chan, M.-C.; Lee, S.S.; Okumura, M.; Oka, T., Laser spectroscopic studies of the pure rotational U₀(0) and W₀(0) transitions of solid parahydrogen, J. Chem. Phys., 1991, 95, 88-97. [all data]

Chan, M.-C.; Xu, L.-W.; Gabrys, M.; Oka, T., High resolution infrared spectroscopy of deuterium in p-H₂ matrix, J. Chem. Phys., 1991, 95, 9404-9407. [all data]

Rehfuss, B.D.; Jagod, M.-F.; Xu, L.-W.; Oka, T., Infrared spectroscopy of highly excited vibrational levels of the hydroxyl ion, OH⁺, J. Mol. Spectrosc., 1992, 151, 59-70. [all data]

Oka, T.; Umemura, T., Vibrational spectra of 1,2,4,5-tetracyanobenzene crystals., Bull. Inst. Chem. Res. Kyoto Univ., 1978, 1978, 176-191. [all data]

Oka, T.; Takagi, K.; Morino, Y., Microwave Spectrum of Formaldehyde in Vibrationally Excited States, J. Mol. Spectrosc., 1964, 14, 27. [all data]

Oka, T.; Tsuchiya, K.; Iwata, S.; Morino, Y., Microwave Spectrum of s-Trioxane, Bull. Chem. Soc. Jpn., 1964, 37, 4. [all data]

Takagi, K.; Oka, T., J. Phys. Soc. Jpn., 1963, 18, 1174. [all data]

Matsumura, C.; Hirota, E.; Oka, T.; Morino, Y., J. Mol. Spectrosc., 1962, 9, 366. [all data]

Oka, T.; Morino, Y., Calculation of Inertia Defect I. General Formulation, J. Mol. Spectrosc., 1961, 6, 472. [all data]

Oka, T.; Morino, Y., Microwqave Spect. of Formaldehyde III. Vibration-Rotation INteraction, J. Phys. Soc. Jpn., 1961, 16, 1235. [all data]

Oka, T., J. Phys. Soc. Jpn., 1960, 15, 2274. [all data]

Kasuya, T.; Oka, T., J. Phys. Soc. Jpn., 1960, 15, 296. [all data]

Kojima, T.; Hirakawa, H.; Oka, T., J. Phys. Soc. Jpn., 1958, 13, 321. [all data]

Hirakawa, H.; Oka, T.; Shimoda, K., J. Phys. Soc. Jpn., 1956, 11, 1207. [all data]

Rackley, S.A.; Butcher, R.J.; Romheld, M.; Freund, S.M.; Oka, T., J. Mol. Spectrosc., 1983, 92, 203. [all data]

Oka, T., J. Mol. Spectrosc., 1978, 72, 172. [all data]

Broten, N.W.; Oka, T.; Avery, L.W.; MacLeod, J.M.; Kroto, H.W., Astrophys. J., 1978, 223, L105. [all data]

Chu, F.Y.; Freund, S.M.; Johns, J.W.C.; Oka, T., J. Mol. Spectrosc., 1973, 48, 328. [all data]

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