Light-induced drift ofCH3F in noble gases

Using a new and sensitive technique, experiments on light-induced drift are performed on vibrationally excited ${\mathrm{CH}}_3$F in the buffer gases He, Ne, Ar, Kr, Xe, and ${\mathrm{CH}}_3$Cl. For the noble buffer gases, the difference in collision frequency between ground- and excited-state ${\mathrm{CH}}_3$F with respect to the buffer-gas molecules is found to range from 0.14% for He to 0.56% for Xe. For the polar buffer gas ${\mathrm{CH}}_3$Cl, this value is found to be 0.98%.