FOURIER-TRANSFORM INFRARED-EMISSION SPECTROSCOPY OF SH

The infrared emission spectrum of SH has been observed in the 1850-2800 cm(-1) spectral region using a Fourier transform spectrometer. The molecules were excited in a microwave discharge source and the spectra have been recorded at a resolution of 0.005 cm-(1). The observed spectra consist of 1-0, 2-1, and 3-2 vibration-rotation bands of the X(2) Pi(1/2), spin component and 1-0, 2-1, 3-2, and 4-3 bands of the X(2) Pi(3/2) spin component. The present data were combined with the previous vibration-rotation, pure rotation, and Lambda-doubling measurements in the ground state to yield an improved set of molecular constants. The principal equilibrium constants obtained from this work are: omega(c) = 2696.2475(58) cm(-1), omega(e),x(e) = 48.7420(28) cm(-1), B-e = 9.600247(51) cm(-1), alpha(c) = 0.27990(10) cm(-1), and r(e) = 1.340614(4) Angstrom. (C) 1995 Academic Press, Inc.