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Issue 1, 2006
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Statistical vs. non-statistical deactivation pathways in the UV photo-fragmentation of protonated tryptophan–leucinedipeptide

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Abstract

The excited state dynamics of protonated tryptophan–leucine ions WLH+, generated in an electrospray source, is investigated by photo-induced fragmentation in the gas phase, using femtosecond laser pulses. Two main features arise from the experiment. Firstly, the initially excited ππ* state decays very quickly with 2 time constants of 1 and 10 ps. Secondly, the transient signals recorded on different fragments are not the same which indicates two competing primary fragmentation processes. One involves a direct dissociation from the excited state that gives evidence for a non-statistical deactivation path. The other is attributed to a statistical decay following internal conversion to the ground electronic surface.

Graphical abstract: Statistical vs. non-statistical deactivation pathways in the UV photo-fragmentation of protonated tryptophan–leucine dipeptide

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Article information


Submitted
21 Jul 2005
Accepted
06 Oct 2005
First published
24 Oct 2005

Phys. Chem. Chem. Phys., 2006,8, 122-128
Article type
Paper

Statistical vs. non-statistical deactivation pathways in the UV photo-fragmentation of protonated tryptophan–leucine dipeptide

G. Grégoire, H. Kang, C. Dedonder-Lardeux, C. Jouvet, C. Desfrançois, D. Onidas, V. Lepere and J. A. Fayeton, Phys. Chem. Chem. Phys., 2006, 8, 122
DOI: 10.1039/B510406H

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