ABSTRACT
Line shift coefficients for five lines of five different isotopomers in the fundamental band of CO in the spectral region near 2058 cm-1 were measured using a three channel lead salt diode laser spectrometer. The study includes the lines P(3) of 13C17O, R(3) of 13C18O, P(9) of 12C18O, P(10) of 13C16O, and P(21) of 12C16O, and covers collisions with N2, O2, H2, D2, He, Ne, Ar, Kr, and Xe. Line shifts of the isotopomers 13C16O, 12C18O, 13C18O, and 13C17O were determined for the first time. Within the experimental uncertainty no significant dependence of the shift effect on the isotopomer was found. The R-branch line under study shows a smaller line shift coefficient than a P-branch line with a similar rotational quantum number. With increasing mass of the noble gas perturber the absolute size of the shift coefficient increases. Moreover self- and nitrogen-broadening coefficients for the isotopomer lines were determined. Compared to previous measurements no significant deviations between different isotopomers were observed. Copyright 1998 Academic Press.
ABSTRACT
With an infrared diode laser spectrometer in pulse mode we studied the N2 broadening of H2S absorption lines in the nu1, nu2, and nu3 bands. Altogether 22 lines were investigated: 16 lines from the R branch of the nu1 band (3 = J" = 17, 0 = Ka" = 6), 5 lines from the R branch of the nu3 band (3 = J" = 7, 1 = Ka" = 7), and one line from the R branch of the nu2 band (J" = 4, Ka" = 3). The nitrogen broadening coefficients varies strongly between 0.028 cm-1/atm = gammaH2S-N2 = 0.109 cm-1/atm. We observed a pronounced J" dependence in the studied quantum number range; i.e., with increasing J" there is a decrease of the broadening coefficient gammaH2S-N2. In contrast the Ka" dependence shows only a weak tendency. For gammaH2S-N2 of the nu1, nu2, and nu3 bands there is no significant difference between lines with comparable rotational quantum numbers. Copyright 1997 Academic Press. Copyright 1997Academic Press