INFRARED DIODE LASER SPECTROSCOPY OF NaCl

Abstract

$^{1}$ G. Thompson, A. G. Maki, and A. Weber, J. Mol. Spectrosc. 118, 540 (1986). $^{2}$ P.L. Clouser and W. Gordy, Phys. Rev. A 134, 863 (1964).Author Institution: Department of Chemistry, Josai University, Keyakidai; Research Institute for Catalysis, Hokkaido UniversityA heat-pipe high temperature cell was incorporated into an optical system of a tunable diode laser spectrometer which covered an infrared range of $350-800 cm^{-1}$. The heat-pipe cell was made of an alumina tube and was similar in construction to that used by Maki $et al.^{1}$ Vibration-rotation spectrum of NaCl was observed in the gas phase under temperatures of 1153-1223 K. The spectral lines in the region of $365-390 cm^{-1}$ were measured. The analysis of the $v=l-0, 2-1, 3-2$, and 4-3 bands of $Na^{35}Cl$ has yielded accurate values of $\omega_{e}, \omega_{e}x_{e}$, and $\omega_{e}y_{e}$ the former two of which are in excellent agreement with those derived in a millimeter-wave molecular-beam $study.^{2}$ Under the high temperature, a small amount of $H_{2}O$ which could not be removed from the sample gas reacted with NaCl to have yielded the spectrum of NaOH. Some results of the spectra of NaOH and a related molecule of LiOH will be shown