title: Rotational cooling of HD+ molecular ions by superelastic collisions with electrons.
abstract: Merging an HD+ beam with velocity matched electrons in a heavy ion storage ring we observed rapid cooling of the rotational excitations of the HD+ ions by superelastic collisions (SEC) with the electrons. The cooling process is well described using theoretical SEC rate coefficients obtained by combining the molecular R-matrix approach with the adiabatic nuclei rotation approximation. We verify the DeltaJ=-2 SEC rate coefficients, which are predicted to be dominant as opposed to the DeltaJ=-1 rates and to amount to (1-2)x10;{-6} cm;{3} s;{-1} for initial angular momentum states with J< or =7, to within 30%.
authors: Department of Particle Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.
authors: D
authors: D
authors: Shafir
authors: S
authors: S
authors: Novotny
authors: H
authors: H
authors: Buhr
authors: S
authors: S
authors: Altevogt
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authors: Faure
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authors: Grieser
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authors: AG
authors: Harvey
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authors: Heber
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authors: Hoffmann
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authors: Kreckel
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authors: Lammich
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authors: Nevo
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authors: Pedersen
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authors: Rubinstein
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authors: Schneider
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authors: Schwalm
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authors: Tennyson
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authors: Wolf
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authors: Zajfman