Rotational Cooling of HD<SUP>+</SUP> Molecular Ions by Superelastic Collisions with Electrons - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2009

Rotational Cooling of HD+ Molecular Ions by Superelastic Collisions with Electrons

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1
D. Shafir
  • Function : Author
S. Novotny
  • Function : Author
H. Buhr
  • Function : Author
S. Altevogt
  • Function : Author
A. Faure
M. Grieser
  • Function : Author
A. G. Harvey
  • Function : Author
O. Heber
  • Function : Author
J. Hoffmann
  • Function : Author
H. Kreckel
  • Function : Author
L. Lammich
  • Function : Author
I. Nevo
  • Function : Author
H. B. Pedersen
  • Function : Author
H. Rubinstein
  • Function : Author
I. F. Schneider
D. Schwalm
  • Function : Author
J. Tennyson
  • Function : Author
A. Wolf
  • Function : Author
D. Zajfman
  • Function : Author

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 ΔJ=-2 SEC rate coefficients, which are predicted to be dominant as opposed to the ΔJ=-1 rates and to amount to (1-2)×10-6cm3s-1 for initial angular momentum states with J≤7, to within 30%.
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Dates and versions

hal-00479905 , version 1 (13-01-2022)

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Attribution - CC BY 4.0

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D. Shafir, S. Novotny, H. Buhr, S. Altevogt, A. Faure, et al.. Rotational Cooling of HD+ Molecular Ions by Superelastic Collisions with Electrons. Physical Review Letters, 2009, 102, pp.223202. ⟨10.1103/PhysRevLett.102.223202⟩. ⟨hal-00479905⟩
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