SPECTROSCOPY AND KINETICS OF RARE-GASES AND THEIR MIXTURES DURING MULTIPHOTON EXCITATION

The purpose of this work is to bring out the analogous behaviour of kr ypton and xenon under multiphotonic excitation through three photons a bsorption Excitation is acheived either on the P-3(1) state itself or in its neighbourhood. In this latter case the excitation consists of p opulating the dissociative 1(u)(P-3(1)) molecular state from ground st ate dimers. It also appears that, in our experimental conditions, exci tation is mainly achieved through absorption of a VUV photon originati ng from the third harmonic of the incident laser beam. In the Kr-Xe mi xture our excitation spectra bear both krypton and xenon components. T he temporal analysis of krypton's emission filtered around 128 mm show s the existence of an energy transfer from the Kr(P-3(1)) state toward s a 5d xenon state through binary collisions whose collision rate is 6 ,810(5) Torr(-1) s(-1).