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Anomalous fluorescence from the second excited singlet state upon excitation to the S4 state of pyrene in a supersonic jet

Paper ID Volume ID Publish Year Pages File Format Full-Text
28312 44069 2012 4 PDF Available
Title
Anomalous fluorescence from the second excited singlet state upon excitation to the S4 state of pyrene in a supersonic jet
Abstract

The electronic spectra of pyrene-h10 and pyrene-d10 were measured in supersonic jets to investigate dynamics in the higher electronic states. The dispersed fluorescence of pyrene-h10 obtained by excitation into the S2 state shows structured bands in the 380 nm region. The 380 nm fluorescence is assigned to the S1 fluorescence, which indicates that fast internal conversion occurs even jet-condition. By excitation into the S4 state, an anomalous S2 fluorescence is observed in addition to the S1 fluorescence. The intensity ratio between the S2 fluorescence and the S1 fluorescence (S2/S1) was calculated. The S2/S1 ratios under jet-cooled conditions is 0.2 which is larger than that in static gas reported by Baba [H. Baba, A. Nakajima, M. Aoi, K. Chihara, J. Chem. Phys. 55 (1971) 2433]. On the other hand, the S2/S1 is 0.1 for pyrene-d10, which indicates that the anomalous S2 fluorescence of pyrene-d10 is weaker than that of pyrene-h10. This result supports that the anomalous S2 fluorescence occurs through a mechanism involving reverse internal conversion from the S1 to the S2 state.

► The electronic spectra of jet-cooled pyrene were measured. ► By excitation into S4 state, an anomalous S2 fluorescence was observed. ► The S2/S1 fluorescence ratio of pyrene-d10 was weaker than that of pyrene-h10.

Keywords
Pyrene; Supersonic jets; Dispersed fluorescence spectrum; Relaxation processes
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Anomalous fluorescence from the second excited singlet state upon excitation to the S4 state of pyrene in a supersonic jet
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 237, 1 June 2012, Pages 49–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us