J. Phys. IV France 10 (2000) Pr5-227-Pr5-230
Resonance enhanced multiphoton ionization within the ion trapA.I. Suslov and V.A. Pushkin
Department of Physics, Ryazan State Radio Technical University, Gagarin St. 59/1, 390024 Ryazan, Russia
Possible schemes of resonance-enhanced two-photon selective ionization of indium atoms by using a dye laser were theoretically investigated. Ionization and excitation were performed by a dye laser [BPO, (395-415)x10-9 m] which was pumped with a pulse nitrogen laser. An optimal value of the focusing spot diameter within the interaction region that provides the maximal ions to be created for a given radiant power. We registered of about 100 ions for one laser pulse and a concentration of indium atoms of about 1014 m-3 for a trapping time of 100 periods of a rf field. Ion-atom scattering and electrode system imperfection cause the number of trapped ions to decrease by a factor of 2.71 for 10-2 c and a pressure of 4x10-6 Torr.
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