HYPERFINE-STRUCTURE ANALYSIS OF ARSINE IN THE GROUND, UPSILON-2 = 1, AND UPSILON-4 = 1 STATES

A number of pure quadrupole resonances in the ground and v4 = 1 states of AsH3 have been measured using the radiofrequency-infrared double-resonance technique in a CO2 laser cavity. The ground stale resonances were titled together with all available radiofrequency and microwave data using the standard treatment. Strong vibration-rotation interactions between the v2 = 1 and v4 = 1 states affect the observed spectrum in the v4 = 1 state. The Hamiltonian model by Aliev and Hougen (J. Mol. Spectrosc.106, 110-123 (1984)) has been used, in the form of a computer program. to describe within the experimental uncertainties the new measurements in a combined analysis with all known experimental data in the v2 = 1 and v4 = 1 states. © 1993 Academic Press, Inc.