NITROGEN BROADENING OF ABSORPTION-LINES IN THE NU(1), NU(2), AND NU(3) BANDS OF H2S DETERMINED BY APPLYING AN IR DIODE-LASER SPECTROMETER

With an infrared diode laser spectrometer in pulse mode we studied the NZ broadening of H2S absorption lines in the nu(1), nu(2), and nu(3) bands. Altogether 22 lines were investigated: 16 lines from the R bran ch of the nu(1) band (3 less than or equal to J '' less than or equal to 17, 0 less than or equal to K-a '' less than or equal to 6), 5 line s from the R branch of the nu(3) band (3 less than or equal to J '' le ss than or equal to 7, 1 less than or equal to K-a '' less than or equ al to 7), and one line from the R branch of the nu(2) band (J '' = 4, K-a '' = 3). The nitrogen broadening coefficients caries strongly betw een 0.028 cm(-1)/atm less than or equal to gamma(H2S-N2) less than or equal to 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 gamma(H2S-N2). In contrast t he K-a '' dependence shows only a weak tendency. For gamma(H2S-N2) of the nu(1), nu(2), and nu(3) bands there is no significant difference b etween lines with comparable rotational quantum numbers. (C) 1997 Acad emic Press.