Iqbal, Azhar and Stavros, Vasillios G.. (2010) Exploring the time scales of H-atom elimination from photoexcited indole. Journal of Physical Chemistry A, Vol.114 (No.1). pp. 68-72. ISSN 1089-5639

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Abstract

Recent spectroscopic measurements have shown that following excitation of indole molecules above the (1)pi pi*-(1)pi sigma* conical intersection, photoinduced N-H bond cleavage results in a range of H-atom kinetic energy release. H-atoms with large amounts of kinetic energy were attributed to direct dissociation whereas those with low kinetic energy were attributed to indirect pathways such as statistical unimolecular decay. With use of a combination of femtosecond pump-probe spectroscopy and velocity map ion-imaging techniques, both energy and time-resolved photoinduced H-atom elimination at 200 nm has been measured. The results show that H-atoms with both high and low kinetic energies are generated on an ultrafast time scale, <200 fs, suggesting that on the time frame of our measurements (<200 ps) there appears to be a direct route to H-atom formation yielding H-atoms with low kinetic energies.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Photochemistry, Indole, Molecular dynamics, Elimination reactions
Journal or Publication Title:	Journal of Physical Chemistry A
Publisher:	American Chemical Society
ISSN:	1089-5639
Date:	14 January 2010
Volume:	Vol.114
Number:	No.1
Number of Pages:	5
Page Range:	pp. 68-72
Identification Number:	10.1021/jp908195k
Status:	Peer Reviewed
Publication Status:	Published
Funder:	Royal Society (Great Britain), Engineering and Physical Sciences Research Council (EPSRC), University of Warwick
Grant number:	EP/E011187 (EPSRC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/16624

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