Kinetic study of the VUV xenon emissions using selective multiphoton excitation

Abstract

Selective excitation of xenon by multiphoton absorption of a dye laser beam gives, in the VUV, the emissions characteristic of this gas, i.e., the resonance line at 147 nm, the first continuum at 150 nm and the second continuum at 173 nm. The kinetic analysis of these emissions was carried out, using a correlation method, between 10−2 and 600 Torr. At low pressures the temporal variation of the density of the resonant 3P1 states allowed the resonance line trapping phenomenon to be demonstrated and the natural lifetime of these states to be determined (τn =4.3 ns). At high pressures the metastable 3P2 states are involved in the emission of the second continuum. The excitation spectra plotted for the blue satellite showed the creation of states in the 4f configuration. This phenomenon indicates that multiphoton ionization is not responsible for the creation of the metastable states. These states are created from a crossing of two molecular levels, one of which is bound (0+u) and responsible for the first continuum and the other of which is dissociative (2u) and correlated to the 3P2 state.

UV emission from excited inert-gas molecules

“…3, Лазерный метод исследования люминесценции ксенона. Схема экспериментальной уста новки [36] (а) и исследование кинетики люминесценции ксенона [36]: спад интенсивности ре зонансной линии (б), зависимость скорости распада состояния от давления,…”

“…На рис. 3,б приведены некоторые результаты этого цикла исследований, выполненных в работе [36]. Такой подход к исследова нию процессов формирования молекул инертных газов за счет механизма атомных столкновений позволил непосредственно из экспериментов опреде лять константы скоростей реакций.…”

Temperature dependence of xenon excimer formations using two-photon absorption laser-induced fluorescence

“…However, except the works of Turner [25] in krypton afterglow and Wieme and Lenaerts [26] in argon, krypton and xenon afterglows, not much attention was paid to the temperature dependence of these three-body rate constants. In these two latter works, the excitation technique was not selective and the kinetic models describing the formation and decay of the lowest xenon excimers do not agree with those proposed using selective excitation methods [14,22,24,27].…”

Spectroscopie et cinétique des gaz rares et leurs mélanges sous excitation multiphotonique

“…Pour ce qui nous concerne, les travaux que nous avons réalisés, d'abord avec de particules alpha [5],puis au moyen d'un faisceau laser puisé et accordable [6] ont pour objectif de déterminer les processus réactionnels responsables de la création et de la disparition des espèces excitées qui conduisent aux émissions U.V.L. des gaz rares.…”