Delayed ionization of laser desorbed C60molecules following 193 nm photoexcitation
作者:
A.C. Jones,
M.J. Dale,
M.R. Banks,
I. Gosney,
P.R.R. Langridge-Smith,
期刊:
Molecular Physics
(Taylor Available online 1993)
卷期:
Volume 80,
issue 3
页码: 583-600
ISSN:0026-8976
年代: 1993
DOI:10.1080/00268979300102471
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Delayed ionization of C60on the microsecond timescale has been investigated following 193 nm excitation of infrared laser desorbed molecules. Biexponential decay of the delayed ion signal indicates the autoionization of two kinetically distinct superexcited states. The lifetimes of these states were determined to be 5 ± 1 μs and 0·8 ± 0·2 μs; their excitation energies are estimated to lie in the range 20–30 eV. These results are compared with the predictions of the Richardson-Dushman and Klots models of thermionic emission. The observation of a dependence of delayed ion intensity on desorption conditions is interpreted in terms of a thermally induced phase change during the desorption process.
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