Argon mediated electron impact ionization of Ar sub n (CH sub 3 OH) sub m heteroclusters

Journal Article · Thu Jan 31 23:00:00 EST 1991 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.459959· OSTI ID:6145161

Vaidyanathan, G; Coolbaugh, M T; Peifer, W R; Garvey, J F ^[1]

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1. Acheson Hall, Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14214 (US)

In this paper we have contrasted electron impact cluster mass spectra of a methanol/argon expansion with a methanol/helium expansion and have measured appearance potentials for several of the prominent ions in each case. We have observed a number of ionic species in the argon expansion (i.e., CH{sub {ital x}}O{sup +} where {ital x}=0--4) which are not observed in the helium expansion. Appearance potentials for these species fall in the region 11.3--11.8 eV indicating that the threshold ionization of Ar{sub {ital n}}(CH{sub 3}OH){sub {ital m}} heteroclusters is mediated by the Ar 4{ital s} excited states ({sup 3}{ital P}{sub 2,0};11.55 and 11.72 eV). This represents the first time that intracluster Penning ionization has been positively identified using electron impact measurements.

• OSTI ID: 6145161
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 94:3; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ADDUCTS
ALCOHOLS
ARGON COMPLEXES
COLLISIONS
COMPLEXES
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
HELIUM COMPLEXES
HYDROXY COMPOUNDS
IONIZATION
MASS SPECTROSCOPY
METHANOL
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
PENNING EFFECT
REACTIVITY
SOLID CLUSTERS
SPECTROSCOPY
VAN DER WAALS FORCES