Collisions of metastable Ne*, He* atoms with ground-state He,Ne atoms studied by atomic beam and laser techniques |
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Authors: | P Féron A Lagrèze J Robert Ch Lerminiaux J Reinhardt J Baudon W Beyer H P Ludescher H Haberland |
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Institution: | 1. Laboratoire de Physique des Lasers, Université Paris-Nord, Av. J.B. Clement, F-93430, Villetaneuse, France 2. Fakult?t für Physik der Universit?t Freiburg, Hermann Herder-Strasse 3, D-7800, Freiburg, Federal Republic of Germany
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Abstract: | A crossed nozzle-beam experiment is used to investigate thermal energy collisions: Ne*(2p 53s,3 P 0, 2)+He(1s 2,1 S 0), almost purely elastic, and He*(1s2s,1, 3 S)+Ne(2p 6,1 S 0), in which inelastic excitation transfers occur. State and velocity selection of the scattered Ne* atoms is performed using a tunablecw dye laser frequency locked on a definite Zeeman component of the transition 1s 5→2p 6 (λ=614.3 nm) of20Ne or22Ne. In the purely elastic case, this technique allows the selection of one of the two final velocities, and then an unambiguous LAB-CM transformation. The differential cross section at 62 meV tallies on accords with a calculation using a single effective potential. In He* on Ne collisions, the main inelastic processes are endothermic excitation transfers from He*(21 S). Experimental results obtained at different energies (62, 95, 109, 124 meV) show that the transfers essentially result in levels 3s and 4d of Ne. |
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