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State-specific reactions and autoionization dynamics of Ar2+ produced by synchrotron radiation

Abstract : The long-lived excited states of doubly charged rare gases can markedly affect their reactivity. In this paper we demonstrate the presence of strong state-specific effects in the charge exchange of Ar2+ (3P, 1D and 1S) with several neutral targets (He, Ne, Kr, Xe, D2, and CH4). State sensitive measurements have been performed by producing the different Ar2+ electronic states via tunable synchrotron radiation (Elettra-Trieste, Italy and SuperACO-Orsay, France). From the product ion yield data of charge transfer, state-selected total cross-sections have been deduced. Using the state-specific reactivity of Ar2+ towards different neutral targets, it has been possible to extract the photon-energy-dependent production branching of the three doubly charged states and to investigate the autoionization dynamics of neutral or singly charged Ar in the vicinity of the double ionization threshold.
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https://hal-insu.archives-ouvertes.fr/insu-00362249
Contributor : Béatrice Pibaret-Bourdon <>
Submitted on : Tuesday, February 17, 2009 - 4:29:47 PM
Last modification on : Wednesday, October 14, 2020 - 3:48:43 AM

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P. Francheschi, Roland Thissen, Odile Dutuit, Christian Alcaraz, H. Soldi-Lose, et al.. State-specific reactions and autoionization dynamics of Ar2+ produced by synchrotron radiation. International Journal of Mass Spectrometry, Elsevier, 2009, 280 (1-3), pp.119-127. ⟨10.1016/j.ijms.2008.07.020⟩. ⟨insu-00362249⟩

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