Time‐resolved spectroscopy of the Ar*2‐excimer emission
作者:
M. Diegelmann,
W. G. Wrobel,
K. Hohla,
期刊:
Applied Physics Letters
(AIP Available online 1978)
卷期:
Volume 33,
issue 6
页码: 525-527
ISSN:0003-6951
年代: 1978
DOI:10.1063/1.90424
出版商: AIP
数据来源: AIP
摘要:
High‐pressure argon was excited by a 2‐ns 600‐keV e‐beam pulse, and time integrated as well as time resolved fluorescence spectra were measured. No significant dependence of line center (126.2±0.1 nm) or spectral width (80±10 nm) of the Ar2continuum on gas pressure was found in the range 0.5–20 bar. From the buildup time constant of fluorescence we calculated the three‐body rate constant for Ar2formation to be 5×10−33cm6/sec. The fluorescence decay was found to consist of two exponentials with time constants 8.6 and 39.2 ns at 20 bar and 12.6 and 73.9 ns at 10 bar, respectively. We attribute this behavior to the fluorescence originating from the singlet and triplet upper state. From the spectral shift between the two components we determined the singlet‐triplet splitting in the excited Ar2molecule to be 12 A˚ corresponding to 760 cm−1.
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