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Comparative study of the formation and decay of xenon excimers following selective excitation of the 5p56s states: spectroscopic and kinetic analysis

In order to specify the mechanisms involved in a xenon dielectric barrier excimer lamp, an experimental work was undertaken using two different set-ups. One study, performed under selective multiphotonic excitation, is presented here and the other, of a dielectric barrier micro-discharge, will be published in another paper. In this work, excitation of the two lower atomic states of the 5p56s configuration was performed: the Xe5p56s(3P2) metastable state and the molecular g states correlated to it or to the Xe5p56s(3P1) resonant state were excited by absorption of two photons. A spectroscopic and kinetic study was performed for the first time, comparing the radiation characteristics consecutive to initially populating either the resonant Xe5p56s(3P1) or the metastable Xe5p56s(3P2) states. A first continuum issuing from 1u state and broader than the 0+u one is observed. The transfer from the 0+u(3P1) state to a dissociative state correlated to Xe5p56s(3P2) is clearly shown. The sum of the transfer and relaxation rate constants was measured: kt + kv = (1.6 ± 0.5) × 106 Torr−1 s−1.