Collisionless dissociation mechanism and vibrational spectrum structure of degenerate modes of symmetric molecules

Observations were made of the structure of the linear absorption spectrum of the 3ν₃ band of the SF₆ molecule associated with anharmonic splitting of the degenerate vibrational levels. Estimates were made of the intramode anharmonicity constants of SF₆. The results permit conclusions to be drawn on the collisionless dissociation mechanism of polyatomic symmetric molecules.