Resonant and Off-resonance ionization of laser-excited sodium vapor |
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Authors: | B Carré F Roussel G Spiess J M Bizau P Gérard F Wuilleumier |
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Institution: | 1. Service de Physique des Atomes et des Surfaces, CEA, CEN Saclay, Gif-sur-Yvette, France 2. Laboratoire de Spectroscopie Atomique et Ionique and LURE, CNRS, Université Paris-Sud, Orsay, France
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Abstract: | Electrons produced in a sodium effusive beam irradiated by pulsed laser light have been energy-analyzed. For resonant excitation of the atoms to the 3p state, we have studied associative ionization of excited Na(3p) (AI), Penning ionization (PI) and photoionization of highly-excited Na(n l),n l=3d, 4p, 5s, 4d/4f, by measurements of electron energy spectra. Our interpretation of the spectra is supported by a numerical analysis of the data which leads to estimates of the cross sections compatible with values previously measured in other experiments. Off-resonance ionization is considered at a particular wavelength. It is presumed to involve laser-excited dimers Na 2 ** . Spectra show that highly-excited atoms are produced by photodissociation of Na 2 ** or from Na 2 ** -Na collisional energy transfer, and that these atoms support the dominant off-resonance ionization channel in our laser excitation conditions. |
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