The vibrational transitions of H3+ continue to be a popular topic among infrared spectroscopists. A highlight is the definite detection of interstellar H3+ by Geballe & Oka in absorption in the direction of deeply embedded protostars.87 H3+ infrared emission lines were also detected in polar regions of Saturn. The lines are weaker than those in Jupiter by two orders of magnitude reflecting the lower plasma activity.88 On the spectroscopic side, Oka and co-workers have observed the near-infrared 3 overtone band of H3+ at 1.4 m using InGaAsP communication diode lasers.89 Spectral lines and the distribution of H3+ in extremely high rotational levels have been studied for supplying data to astronomers.90 New experiments and analysis of the H3+ vibration-rotation spectra were also made by the NRC group in Canada,91 and by Maier's group.92 Spin selection rules in plasma chemistry of ortho- and para-H3+ has been experimentally demonstrated.93 Oka also reported on the infrared spectra of several other ions. The spectrum of N2H+ in highly-excited vibrational states up 10600 cm-1 has been observed and analyzed,94 as has the hot band of NH3+,95 and the infrared spectrum of NH2+.96 The infrared spectrum of CH3+ involving high rotational levels has been observed and the rotational distribution studied.97 The spectrum of C2H3+ was measured using a hollow cathode discharge, and its chemistry analyzed.98 The infrared work at the Herzberg Institute of Astrophysics has concentrated on the spectra of weakly-bonded complexes, including CO-N2,99 CO-He,100 and the HD dimer.101 Fundamental infrared spectroscopy has been performed for the band of C3 isotopes,102 C4,103 CH3NC,104 CH3OH isotopes,105-107 C2H2 and isotopes,109,109 and C3O2.110 High resolution wavenumber standards for the infrared have been published.111 Bernath and co-workers have used the Fourier transform method to measure the infrared spectra of a large number of stable and unstable species, including ND, PH,112 hot H2O,113 HF,114 SiO,115 CS,116 and SH.117 Pure carbon molecules, including C60 and C70 have been discussed.118-120 Theoretical calculations of ground state potential energy surfaces and dipole moments have been made for CO,121 MgO+,122 NO,45 SiO,123 and C2H2+.124 Theoretical infrared spectra for PAH's (neutral, cations and anions) have been computed by Langhoff.125
Oka also reported on the infrared spectra of several other ions. The spectrum of N2H+ in highly-excited vibrational states up 10600 cm-1 has been observed and analyzed,94 as has the hot band of NH3+,95 and the infrared spectrum of NH2+.96 The infrared spectrum of CH3+ involving high rotational levels has been observed and the rotational distribution studied.97 The spectrum of C2H3+ was measured using a hollow cathode discharge, and its chemistry analyzed.98 The infrared work at the Herzberg Institute of Astrophysics has concentrated on the spectra of weakly-bonded complexes, including CO-N2,99 CO-He,100 and the HD dimer.101 Fundamental infrared spectroscopy has been performed for the band of C3 isotopes,102 C4,103 CH3NC,104 CH3OH isotopes,105-107 C2H2 and isotopes,109,109 and C3O2.110 High resolution wavenumber standards for the infrared have been published.111 Bernath and co-workers have used the Fourier transform method to measure the infrared spectra of a large number of stable and unstable species, including ND, PH,112 hot H2O,113 HF,114 SiO,115 CS,116 and SH.117 Pure carbon molecules, including C60 and C70 have been discussed.118-120 Theoretical calculations of ground state potential energy surfaces and dipole moments have been made for CO,121 MgO+,122 NO,45 SiO,123 and C2H2+.124 Theoretical infrared spectra for PAH's (neutral, cations and anions) have been computed by Langhoff.125
The infrared work at the Herzberg Institute of Astrophysics has concentrated on the spectra of weakly-bonded complexes, including CO-N2,99 CO-He,100 and the HD dimer.101 Fundamental infrared spectroscopy has been performed for the band of C3 isotopes,102 C4,103 CH3NC,104 CH3OH isotopes,105-107 C2H2 and isotopes,109,109 and C3O2.110 High resolution wavenumber standards for the infrared have been published.111 Bernath and co-workers have used the Fourier transform method to measure the infrared spectra of a large number of stable and unstable species, including ND, PH,112 hot H2O,113 HF,114 SiO,115 CS,116 and SH.117 Pure carbon molecules, including C60 and C70 have been discussed.118-120 Theoretical calculations of ground state potential energy surfaces and dipole moments have been made for CO,121 MgO+,122 NO,45 SiO,123 and C2H2+.124 Theoretical infrared spectra for PAH's (neutral, cations and anions) have been computed by Langhoff.125
Bernath and co-workers have used the Fourier transform method to measure the infrared spectra of a large number of stable and unstable species, including ND, PH,112 hot H2O,113 HF,114 SiO,115 CS,116 and SH.117 Pure carbon molecules, including C60 and C70 have been discussed.118-120 Theoretical calculations of ground state potential energy surfaces and dipole moments have been made for CO,121 MgO+,122 NO,45 SiO,123 and C2H2+.124 Theoretical infrared spectra for PAH's (neutral, cations and anions) have been computed by Langhoff.125
Theoretical calculations of ground state potential energy surfaces and dipole moments have been made for CO,121 MgO+,122 NO,45 SiO,123 and C2H2+.124 Theoretical infrared spectra for PAH's (neutral, cations and anions) have been computed by Langhoff.125
