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Thermal desorption of CF3Br induced by resonant infrared absorption
Affiliation:1. Physics Department, Faculty of Science, Helwan University, 11792, Helwan, Cairo, Egypt;2. Spectroscopy of Polarized Light Laboratory, Physics Department, Faculty of Science, Galala University, New Galala City, Suez, 43511, Egypt;3. Physics Department, Faculty of Science, Ain Shams University, 11566, Abbassia, Cairo, Egypt;4. Physics Department, Faculty of Science, Al-Azhar University, 71452, Assuit, Egypt;5. Physics Department, Faculty of Science, Islamic University of Madinah, Almadinah Al-Munawarah, 42351, Saudi Arabia;1. Nano and Thin film lab. Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt;2. Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan;3. Physics Department, Faculty of Science, South Valley University, Qena 83523, Egypt
Abstract:A thin film of CF3Br is condensed on a cold Ag or ZnSe surface (≈ 110 K) and is subsequently desorbed under resonant absorption of CW CO2 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.
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