ν_3 vibrational ladder of SF_6

Abstract

From an analysis of the high-resolution spectrum of the 3ν₃ manifold of SF₆, we have determined the anharmonicity constants to be (in reciprocal centimeters) X₃₃ = −1.7426, G₃₃ = 0.9188, and T₃₃ = −0.24635. By using these constants, one can for the first time to our knowledge accurately predict the energies of the lower-vibrational sub-levels of the ν₃ ladder and determine the pathways for multiple-photon absorption.