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Important factors for the radiolysis-induced emission intensity of aromatic hydrocarbons

Paper ID Volume ID Publish Year Pages File Format Full-Text
27912 44049 2009 7 PDF Available
Title
Important factors for the radiolysis-induced emission intensity of aromatic hydrocarbons
Abstract

Emission from charge recombination between radical cation and anion of various aromatic hydrocarbons (AHs) was observed in the time scales of nanosecond to microsecond during the pulse radiolysis of AH in benzene (Bz). Based on the time-dependent emission study, it is suggested that AH in the excited singlet state (1AH*) is generated in the nanosecond to microsecond time scale mainly from the charge recombination between AH radical cation (AH+) and AH radical anion (AH−). This mechanism is reasonably explained by the relationship between the annihilation enthalpy change (−ΔH°) for the charge recombination and excitation energies of 1AH* (ES1). It is found that the rate constant of the charge recombination (krec) between AH+ and AH− increases with the increase of energy differences between −ΔH° and ES1 of AH (−ΔH° − ES1), indicating that the intensity of the radiolysis-induced emission from AH (I) depends on (−ΔH° − ES1). The effect of (−ΔH° − ES1) on I value was also examined during the pulse radiolysis of mixtures of two AHs in Bz. Consequently, it is suggested that not only the fluorescence quantum yield (Φfl) of 1AH* but also (−ΔH° − ES1) is important factor for the formation yield of 1AH* during the pulse radiolysis of AH in Bz.

Keywords
Aromatic compound; Charge recombination; Fluorescence; Pulse radiolysis; Radical ions
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Important factors for the radiolysis-induced emission intensity of aromatic hydrocarbons
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 205, Issues 2–3, 25 June 2009, Pages 179–185
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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