Light-induced drift of CH3Br molecules

A light-induced drift of CH₃Br molecules was observed when the ν₆ mode was vibrationally excited by CO₂ laser radiation. Measurements of the drift were made using the light-induced splitting of the isotopic modifications of CH₃⁷⁹Br and CH₃⁸¹Br molecules. It was found that the vibrational excitation of CH₃Br molecules increases their transport collision frequencies by ~ 1%.