Infrared multiphoton energy deposition in chlorodifluoromethane
Energy absorption by CF2HCl from an intense CO2 laser pulse was measured as a function of the laser energy fluence, the temp., the pressure of CF2HCl, and the pressure of Ar bath gas. For collision-free multiphoton absorption, the av. no. of photons absorbed per mol. increases from 2 to nearly 12 when the fluence is increased from 1.6 to 10.9 J-cm-2 at 298 K. Compariosn of absorption and dissocn. data measured under identical conditions indicates relatively wide internal energy distributions produced by the multiphoton excitation. At 3 J-cm-2 the av. no. of photons absorbed per mol. increases with increasing temp. between 300 and 450 K, whereas in the same temp. range at 10.7 J-cm-2, a pronounced max. was found in the absorption near 370 K. In the presence of 1 atm of added Ar, an av. of as many as 100 photons per mol. of CF2HCl can be absorbed as compared to the 18 photons necessary for collisionless dissocn.
Keywords: 75-45-6 Role: PRP (Properties) (laser multiphoton absorption by) ; 7440-37-1 Role: PRP (Properties) (laser multiphoton absorption by chlorodifluoromethane in presence of) ; laser multiphoton absorption chlorodifluoromethane ; methane chlorodifluoro multiphoton absorption
Copyright 2003 ACS
Spectra by Absorption, Emission, Reflection, or Magnetic Resonance, and Other Optical Properties
Inst. Chim. Phys.,Ec. Polytech. Fed. Lausanne,Lausanne,Switz. FIELD URL:
written in English.
Photon (absorption of many, by chlorodifluoromethane); Laser radiation (multiphoton absorption of, by chlorodifluoromethane); Energy level transition; Photolysis (multiphoton, of chlorodifluoromethane)
Record created on 2011-02-01, modified on 2016-08-09