Electron impact ionization efficiency curves of argon clusters and argon/methanol heteroclusters
- State Univ. of New York, Buffalo, NY (United States)
In a previous paper the authors reported electron impact appearance energies for Ar{sub n}(CH{sub 3}OH){sub m} heteroclusters for small cluster sizes and concluded that at threshold the dominant ionization mechanism was intracluster Penning ionization involving the electronically excited 4s state of an argon atom. In this paper they have extended these measurements to a wider range of stagnation pressures and electron energies and observe that the appearance energies of argon-methanol heterocluster ions shift to higher values which they interpret as consistent with exciton-induced Penning ionization. The authors have observed additional high-energy structure in the electron ionization efficiency curves of certain cluster ions around 27 eV, only under expansion conditions which favor the formation of large clusters. Possible explanations for this high-energy structure are discussed. 29 refs., 6 figs., 1 tab.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 554986
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 4 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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