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The Radiation-Induced Formation of Excited States of Aromatic Hydrocarbons in Benzene and Cyclohexane. III. Effect of Singlet State Quenchers

Frederick Dainton, T. Morrow, G. A. Salmon and G. F. Thompson
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 328, No. 1575 (Jun. 27, 1972), pp. 481-496
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/78166
Page Count: 16
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Radiation-Induced Formation of Excited States of Aromatic Hydrocarbons in Benzene and Cyclohexane. III. Effect of Singlet State Quenchers
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Abstract

The contribution to naphthalene and pyrene triplet state formation of intersystem crossing from the excited singlet state has been determined for both cyclohexane and benzene solutions using the singlet state quenchers nitromethane and xenon. In agreement with the conclusions reported in part II, intersystem crossing plays an important role; under certain conditions up to 50% of the total triplet yield in naphthalene-cyclohexane solutions has this origin. The extinction coefficient for naphthalene triplet absorption in cyclohexane at λ max=412.5 nm is 20000 ± 5000 l mol-1 cm-1.

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