THE INFRARED SPECTRUM OF HYDROGEN SULFIDE IN THE 2.6-MICRON $REGION^{*}$

Abstract

The spectrum of $H_{2}S$ has been obtained in the region from $3730 cm^{-1}$ to $4030 cm^{-1}$ using a vacuum spectrograph equipped with a 15,000-line-per-inch grating and a PbS detector. Calibration was made from second order emission lines of argon and interference fringes of a Fabray-Perot etalon. The absorption has been assigned to two overlapping bands, an A-type band $(n_{1}, n_{2}, n_{3}) = (0, 1, 1)$, and a B-type band (1, 1, 0). The excited state inertial parameters found for the (0, 1, 1) band are: $A = 10.517 cm^{-1}$, $B = 9.124 cm^{-1}$, $C = 4.619 cm^{-1}$ and $\nu_{0} = 3789.07 cm^{-1}$. The corresponding values for the (1, 1, 0) band are: $A = 10.595 cm^{-1}$, $B = 8.985 cm^{-1}$, $C = 4.603 cm^{-1}$ and $\nu_{o} = 3779.23 cm^{-1}$.