Spectroscopy of the polyatomic molecules,excited by an intense IR laser field

Using double IR resonance technique the transformation of the SF₆ linear spectrum while excited by fn intense laser field has been investigated. The saturation intensities for the transitions between excited vibrational states of the SF₆ have been measured. It has been found that the multiplephoton laser excitation is forming two molecular ensembles, one of these two is strongly excited along the ν₃ mode. It is shown that between excited vibrational states a fast collisional relaxation is taking place.