Shafir, D; Novotny, S; Buhr, H; Altevogt, S; Faure, A; Grieser, M; Harvey, AG; ... Zajfman, D; + view all Shafir, D; Novotny, S; Buhr, H; Altevogt, S; Faure, A; Grieser, M; Harvey, AG; Heber, O; Hoffmann, J; Kreckel, H; Lammich, L; Nevo, I; Pedersen, HB; Rubinstein, H; Schneider, IF; Schwalm, D; Tennyson, J; Wolf, A; Zajfman, D; - view fewer (2009) Rotational Cooling of HD+ Molecular Ions by Superelastic Collisions with Electrons. PHYS REV LETT , 102 (22) , Article 223202. 10.1103/PhysRevLett.102.223202.

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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 Delta J=-2 SEC rate coefficients, which are predicted to be dominant as opposed to the Delta J=-1 rates and to amount to (1-2)x10(-6) cm(3) s(-1) for initial angular momentum states with J <= 7, to within 30%.

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