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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Féron, P., Lagrèze, A., Robert, J. et al. Collisions of metastable Ne*, He* atoms with ground-state He, Ne atoms studied by atomic beam and laser techniques. Z Phys D - Atoms, Molecules and Clusters 10, 221–226 (1988). https://doi.org/10.1007/BF01384856
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DOI: https://doi.org/10.1007/BF01384856