Excitation Transfer Process in Penning Ionization of the CO Molecule by Helium Atoms in Singlet Metastable State - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal de Physique II Année : 1997

Excitation Transfer Process in Penning Ionization of the CO Molecule by Helium Atoms in Singlet Metastable State

B. Lescop
M. Ben Arfa
  • Fonction : Auteur
G. Le Coz
  • Fonction : Auteur
M. Cherid
  • Fonction : Auteur
G. Sinou
  • Fonction : Auteur
G. Fanjoux
A. Le Nadan
  • Fonction : Auteur
F. Tuffin
  • Fonction : Auteur

Résumé

Penning ionization electron spectroscopy of the CO molecule by He* (21S) metastable atoms is studied. Vibrational populations are reported for the three energetically accessible states of the CO+ ion (X2Σ+, A2 Π and B2Σ+). An obvious discrepancy is observed between the excited vibrational levels of the X2Σ+ state and the calculated Franck-Condon factors. This result is attributed to an excitation transfer process via Rydberg vibrational progression converging to the CO+ (D2 Π) ionic state in agreement with the recent observations by fluorescence of neutral dissociate states. The presence of electrons coming from the well-known σ shape resonance is not excluded.

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jpa-00248532 , version 1 (04-02-2008)

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B. Lescop, M. Ben Arfa, G. Le Coz, M. Cherid, G. Sinou, et al.. Excitation Transfer Process in Penning Ionization of the CO Molecule by Helium Atoms in Singlet Metastable State. Journal de Physique II, 1997, 7 (11), pp.1543-1554. ⟨10.1051/jp2:1997202⟩. ⟨jpa-00248532⟩

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