The Overtone Spectrum of H2 32S near 13 200 cm−1

Abstract

The intracavity laser absorption spectrum of H232S has been recorded near 13200 cm−1with an equivalent absorption pathlength of 25 km. The observed spectrum is assigned to the (50±,v2= 1) states constituting a local mode pair in strong H22-type interaction. The rovibrational analysis has allowed the assignment of 210 lines involving 86 rotational upper state levels which have been reproduced with a rms of 0.023 cm−1close to the experimental accuracy. A perturbation affecting one line is assigned to a local interaction with the (40±,v2= 3) local mode pair. The influence of the bending excitation on the local mode character of the (n0±,v2= 1) stretch-bend combination levels is discussed on the basis of the values of the rotational constants and of the H22interaction parameters.