Charging Effects in an Electron Bombarded Ar Matrix and the Role of Chemiluminescence-Driven Relaxation.

Savchenko, E. V., Khyzhniy, I. V., Uyutnov, S. A., Gumenchuk, G. B., Ponomaryov, A. N., Beyer, M. K. and Bondybey, V. E. (2011) Charging Effects in an Electron Bombarded Ar Matrix and the Role of Chemiluminescence-Driven Relaxation. Journal of Physical Chemistry A, 115 (25). pp. 7258-7266. DOI 10.1021/jp2004419.

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Abstract

The relaxation processes in pure and doped Ar films preirradiated by an electron beam are studied with the focus on charging effects. Correlated real time measurements have been performed applying current and optical activation spectroscopy methods. Thermally stimulated exoelectron emission and thermally stimulated luminescence are detected in the vacuum ultraviolet and visible range. An appreciable accumulation of electrons in the matrix is found, and prerequisites for negative space charge formation are ascertained. The part played by pre-existing and radiation-induced defects as well as dopants is considered and the temperature range of the electron trap stability is elucidated. It is shown that laser-induced electron detachment from O(-) centers results in an enhancement of electron detrapping via the chemiluminescence mechanism, viz, neutralized and thermally mobilized O atoms recombine. Formation of O(2)* results in the emission of visible photons. These photons act as a stimulating factor for electron release and transport, terminating in exoelectron emission and charge recombination. Chemiluminescence therefore plays an important role in the decay of charged centers.

Document Type: Article
Keywords: rare-gas solids atomic oxygen thin-films luminescence emission energy states o-2 kr recombination
Research affiliation: Kiel University
Refereed: Yes
DOI etc.: 10.1021/jp2004419
ISSN: 1089-5639
Date Deposited: 01 Nov 2012 04:56
Last Modified: 23 Jan 2013 10:04
URI: http://oceanrep.geomar.de/id/eprint/18514

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