Koui Horiai

Vibration–rotational spectra of GaF and molecular properties of diatomic fluorides of elements in group 13

From new measurements of vibration–rotational spectra of 69Ga19F and 71Ga 19F in absorption with laser diodes in the wavenumber region 54 800 ⩽/m–1⩽ 63 800, we evaluated radial coefficients that serve to reproduce the wavenumbers of 229 IR lines and published frequencies of 27 microwave lines within small uncertainties. The maximum range of validity of radial functions is 1.57 ⩽R/10–10 m ⩽ 2.10, and Re=(1.774 341 0 ± 0.000 001 5)× 10–10 m, after corrections for non-adiabatic effects. For comparison with results of GaF and TIF previously reported, we analysed published microwave and IR spectra of BF, AIF and InF; maximum ranges of validity of pertinent radial functions and a table of parameters are presented. For BF we find experimental evidence for the sense –BF+ of electric polarity.

Infrared emission spectrum of GaF

Abstract The infrared emission spectrum of Δ v =1 bands of GaF has been observed at 1000°C with a resolution of 0.1 cm −1 . The v =1-0 to 5-4 vibration-rotation bands of 69 GaF and the v =1-0 to 4-3 bands of 71 GaF were assigned in the wavenumber range between 500 and 645 cm −1 . The analysis has led to a set of values of eight Dunham coefficients, Y 10 , Y 20 , Y 30 , Y 01 , Y 11 , Y 21 , Y 02 and Y 12 of 69 GaF, Y 10 and Y 20 were determined to be 622.367(11) and −3.3049(42) cm −1 , respectively, with twice the standard errors in parentheses. The infrared diode-laser spectrum of GaF has also been observed and the assignment of some spectral lines is shown.

Infrared diode laser spectroscopy of a high-temperature molecule GeS using spectrum processing by fourier transformation

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Infrared emission spectrum of AlBr

G. Thompson, A. G. Maki, and A. Weber, J. Mol. Spectrosc. 118, 540 (1986).

Infrared diode laser spectra of NaCl

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Infrared diode laser spectroscopy of high-temperature molecules using spectrum processing by Fourier transformation

P.L. Clouser and W. Gordy, Phys. Rev. A 134, 863 (1964).

Far infrared emission spectroscopy of KCl

Abstract The vibrational-rotational spectrum of GeS has been observed using a diode laser spectrometer equipped with a heatpipe high-temperature cell of a White cell type. Fringes due to optical reflections inside the high-temperature White cell were inherent in the observation of the spectra. However, they were eliminated, as were high-frequency noises, by Fourier manipulation of the observed diode laser spectrum. About 620 spectral lines for the Δv = 1 band sequences of the eight isotopomers, 74Ge32S, 72Ge32S, 70Ge32S, 73Ge32S, 76Ge32S, 74Ge34S, 72Ge34S and 70Ge34S have been assigned between 522 and 593 cm−1. These infrared data combined with 91 microwave data from the literature have been analyzed with a least-squares fit to a Dunham potential function with only 11 parameters which included three Watson type Δ correction terms. The Dunham Yij coefficients have been derived for each of the eight isotopomers. The equilibrium vibrational frequency ωe of 74Ge32S is 574.269 313(271) cm−1.

Infrared-microwave double resonance of atomic chlorine on laser-magnetic-resonance fine-structure transitions

Abstract An infrared emission spectrum of the Δν=1 bands of AlBr has been observed with a Fourier transform spectrometer with 0.1 cm −1 resolution. The ν=1-0 to 3-2 and ν=5-4 vibration-rotation bands of Al 79 Br and the ν=1-0 to 5-4 bands of Al 81 Br were assigned in the wavenumber range between 310 and 400 cm −1 . The infrared data combined with millimeter-wave data from the literature were analyzed with a least-squares fit to a Dunham potential function with only seven parameters. Thirteen Dunham Y ij coefficients have been derived for each of the isotopic species.

Infrared absorption spectroscopy of Ar-12C18O2 : change in the intramolecular potential upon complex formation

Abstract The infrared spectra of the Δν=1 bands of NaCl at about 900°C have been observed from 365 to 390 cm −1 with a tunable diode laser spectrometer. Transitions of the 1-0, 2-1, 3-2, and 4-3 bands of Na 35 Cl were analyzed in a single least-squares fit to a set of nine Dunham coefficients Y ij . Y 10 (≈ω e ) and Y 20 (≈-ω e χ e )for Na 35 Cl were determined to be 364.6985(25) cm −1 and −1.7745(17) cm −1 , respectively, with the standard errors in parentheses.