Thermal desorption of CF3Br induced by resonant infrared absorption

Abstract A thin film of CF 3 Br is condensed on a cold Ag or ZnSe surface (≈ 110 K) and is subsequently desorbed under resonant absorption of CW CO 2 laser radiation. The condensation process is determined by the surface temperature. The desorption is monitored as a transient pressure peak. The maximum desorption rate is proportional to the film thickness and to the resonantly absorbed infrared laser power. The desorption process is of thermal nature and determined by the thermal properties of the Ag or ZnSe substrate. The wavelength dependence varies strongly with surface temperature and film thickness.