Title

Ionization energies of argon clusters: A combined experimental and theoretical study

Abstract

We have measured appearance energies of Ar-n(+), n <= 30, by electron impact of gas phase clusters. Quantum-chemical calculations have been performed to determine the adiabatic and vertical ionization energies of argon clusters up to n=4 and 6, respectively. The experimental appearance energy of the dimer ion approaches, under suitable cluster source conditions, the adiabatic ionization energy. The agreement with values obtained by photoionization and threshold photoelectron-photoion coincidence (TPEPICO) spectra demonstrates that autoionizing Rydberg states are accessible by electron impact. Appearance energies of larger clusters, though, exceed the TPEPICO values by about 0.5 eV. (c) 2005 American Institute of Physics.

Department

Physics

Publication Date

8-30-2005

Journal Title

Journal of Chemical Physics

Publisher

AMERICAN INSTITUTE OF PHYSICS

Digital Object Identifier (DOI)

10.1063/1.2006095

Document Type

Article

Rights

© 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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