Electron spectrometry study of associative and penning ionization in laser excited sodium vapor |
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| Authors: | B Carré G Spiess JM Bizau P Dhez P Gérard F Wuilleumier JC Keller JL Le Gouët JL Picqué DL Ederer PM Koch |
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| Institution: | Service de Physique des Atomes et des Surfaces, CEA, CEN, Saclay, France;Laboratoire de Spectroscopie Atomique et Ionique and LURE, CNRS, and Université Paris Sud, Orsay, France;Laboratoire Aimé Cotton, CNRS, Orsay, France;National Bureau of Standards, Washington D.C,, USA;Physics Department, State University of New York, Stony Brook, USA |
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| Abstract: | The first observation, by electron spectrometry, is reported in laser-excited sodium vapor of the primary low energy electrons produced by associative ionization and by Penning ionization of sodium atoms in highly excited n1 states. The sequential heating of these primary electrons has been observed in 1, 2 or 3 superelastic collisions with Na(3p) atoms. The variation of associative ionization was measured as a function of the excited state density by using inner-shell photoionization produced by synchrotron radiation. Finally, an associative ionization cross section of 3.8 X 10-17 cm2 and a Penning ionization cross section for the 5s state of 1.1 X 10-12 cm2 were found (within 50% uncertainty) for an oven temperature of 520 K. |
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