Ion-Induced Fragmentation of Amino Acids: Effect of the Environment

S. Maclot, M. Capron, R. Maisonny, A. Lawicki, A. Mery, J. Rangama, J.-Y. Chesnel, S. Bari, R.A. Hoekstra, T.A. Schlathölter, B. Manil, L. Adoui, P. Rousseau, B.A. Huber

Research output: Contribution to journalArticleAcademicpeer-review

46 Citations (Scopus)

Abstract

In general, radiation-induced fragmentation of small amino acids is governed by the cleavage of the C-C(alpha) 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(alpha) 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(alpha) 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.

Original languageEnglish
Pages (from-to)930-936
Number of pages7
JournalChemphyschem
Volume12
Issue number5
DOIs
Publication statusPublished - 4-Apr-2011

Cite this