On the Generation of C2-Radicals by IR-Multiple-Photon Dissociation
In most cases of laser assisted photolytic reactions, for example deposition, etching and doping of electronic materials, the laser was used to dissociate the parent molecules, i.e. to generate free radicals. Among these laser assisted photolytic reactions the IR multiple photon dissociation (IR-MPD) is a powerful technique for the generation of free radicals . In the present paper we give some results concerning the investigation of the production of C2 radicals by IR-MPD of molecules, such as C2H4 and C2H4Cl, with TEA-CO2-laser pulses. The spontaneous and laser induced fluorescence were used to detect the carbon radicals. We have investigated the pressure, excitation wavelength and time dependences of the (relative) concentration of the C2 radicals in the d3πg and a3πu states of the well-known Swan band.
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