Document Detail


Ion-Induced Fragmentation of Amino Acids: Effect of the Environment.
MedLine Citation:
PMID:  21370376     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In general, radiation-induced fragmentation of small amino acids is governed by the cleavage of the CC(α) bond. We present results obtained with 300 keV Xe(20+) ions that allow molecules (glycine and valine) to be ionised at large distances without appreciable energy transfer. Also in the present case, the CC(α) bond turns out to be the weakest link and hence its scission is the dominant fragmentation channel. Intact ionised molecules are observed with very low intensities. When the molecules are embedded in a cluster of amino acids, a protective effect of the environment is observed. The fragmentation pattern changes: the CC(α) bond becomes more protected and stable amino acid cations are observed as fragments of the molecular clusters. Evidently, the molecular cluster acts as a "buffer" for the excess energy, capable of rapidly redistributing excess energy and charge.
Authors:
Sylvain Maclot; Michael Capron; Rémi Maisonny; Arkadiusz Lawicki; Alain Méry; Jimmy Rangama; Jean-Yves Chesnel; Sadia Bari; Ronnie Hoekstra; Thomas Schlathölter; Bruno Manil; Lamri Adoui; Patrick Rousseau; Bernd A Huber
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-2
Journal Detail:
Title:  Chemphyschem : a European journal of chemical physics and physical chemistry     Volume:  -     ISSN:  1439-7641     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954211     Medline TA:  Chemphyschem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Affiliation:
CIMAP, CEA/CNRS/ENSICAEN, Université de Caen Basse-Normandie, Bd Henri Becquerel, BP 5133, F-14070 Caen cedex 5 (France), Fax: (+33) 2-31-45-47-14.
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