Journal of the Chemical Society - Faraday Transactions p. 3129 - 3138 (1992)
Update date:2022-08-30
Topics:
Sakka, Tetsuo
Iwasaki, Matae
Ogata, Yukio
Infrared multiphoton absorption (IRMPA) and dissociation (IRMPD) of CClF2CH2Cl have been studied by low-fluence CO2 laser irradiation (<1.0 J cm-2).Laser beams of spatially uniform intensity, obtained by mild focusing and a short irradiation cell length, were used.The IRMPD yields were measured as a function of reactant pressure, added-gas pressure, laser-energy fluence and laser wavenumber, and the IRMPA was measured as a function of reactant pressure, added-rare-gas pressure, and laser-energy fluence.The results of the IRMPD yields plotted against reactant and added-gas pressure show that molecular collisions play an important role in the excitation process.The effects of the reactant pressure and added-rare-gas concentration upon the product yield can be interpreted by a combination of some positive and negative effects of molecular collisions.On the other hand, the dissociation yields obtained as a function of added CF2CHCl pressure suggest that the relaxation of anharmonicity bottlenecking by resonant vibrational energy transfer is also important for IRMPD of this molecule.It can be seen that the other experimental results, i.e. the results of the IRMPA experiments and the frequency dependence of the IRMPD yield are consistent with the above interpretation.
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