Infrared multiphoton dissociation of CHFCl 2

Abstract

We have studied the dependence of the IR laser induced multiphoton dissociation of CHFCl 2 on laser wavelength and fluence, number of laser pulses and initial CHFCl 2 pressure. Multiphoton dissociation spectrum presents a broad maximum centered at 9.342 μm. Dissociation has a strongly dependence on initial CHFCl 2 pressure and laser fluence. There exists a pressure lower limit (≈ 0.4 mb) below which no significant dissociation occurs. Up to 2.1 J/cm 2 no unimolecular dissociation takes place in a significant proportion. The only radical we have been able to clearly detect by real time optical absorption technique is CFCl. This supports the mechanism reaction CHFCl 2 + nhν → CFCl + HCl.