Electron-Stimulated Desorption of Positive Ions from Methanol Adsorbed on a Solid ArSubstrate

H. Kawanowa (), K. Hanatani, Y. Gotoh and R. Souda
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H. Kawanowa: Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;
K. Hanatani: Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278-8510, Japan
Y. Gotoh: Department of Materials Science and Technology, Science University of Tokyo, Noda, Chiba 278-8510, Japan
R. Souda: Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 271-275

Abstract: Electron-stimulated desorption (ESD) of positive ions from weakly physisorbed molecules has been investigated. From methanol adsorbed on a solid Ar substrate, the protonated cluster ions of the typeH+(CH3OH)n(n = 1 - 4)are emitted, together with the fragment ions such as${\rm CH}_n^+$(n = 0 - 3), H3O+, CHO+, CH3O+, etc. The yields of these ions are markedly enhanced at the smallest coverage and decay steeply with increasing coverage. Coulomb explosion between valence holes confined in adsorbed nanoclusters is responsible for the enhanced ion yields. Very few ions except for H+are emitted from a thick layer as well as nanoclusters adsorbed directly on a metal substrate due to the delocalization of valence holes.

Date: 2003
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DOI: 10.1142/S0218625X03005244

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