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The radiative lifetime of acetone: resolution of an apparent discrepancy

✍ Scribed by Hanna Zuckermann; Bernhard Schmitz; Yehuda Haas

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 425 KB
Volume: 151
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(88)85143-1

No coin nor oath required. For personal study only.

✦ Synopsis

Past determinations

of the radiative lifetime of acetone (and other ketones) used two methods. One was based on the integrated absorption coefflcicnt and the relationship between the Einstein A and B coefficients. The other, on the ratio between the measured quantum yield and the measured lifetime. The latter resulted in consistently shorter radiative lifetimes than the former. Based on low-pressure bulk and jet results, It IS shown that the short observed decay time used in the second method is due not to external quenching but to an intramolecular process. The Stern-Volmer mechanism is inapplicable in this case since the process cannot be properly represented by a rate constant. The Einstein coefftcient method is thus the prefered one.

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