Infrared diode laser spectroscopy of the ν2 fundamental band of SH 3+

Abstract

The high-resolution absorption spectrum of the ν 2 fundamental band of SH 3 + has been observed with the magnetic field modulation technique. The ions were generated in a hollow cathode discharge through a mixture of H 2 and H 2S. The molecular constants in the excited vibrational state are determined through a least-squares fit of the data to a standard symmetric top energy level expression. The anomalous sign of the centrifugal distortion constants is explained by the Coriolis interaction between the v 2 = 1 and v 4 = 1 states.