Fragmentation of tryptophan by low-energy electrons

被引：34

作者：

Abdoul-Carime, H ^{[1
]}

Gohlke, S ^{[1
]}

Illenberger, E ^{[1
]}

机构：

[1] Free Univ Berlin, Inst Chem Phys & Theoret Chem, D-14195 Berlin, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 402卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2004.12.073

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Decomposition of gas phase tryptophan (trp) following low energy (<10 eV) electron attachment is investigated by means of a crossed electron/molecular beam experiment. Various negatively charged species are observed, attributed to (trp - H)(-) (203 amu), (gly-yl)(-) (74 amu), HCO2- (45 amu), CN- (26 amu), OH- (17 amu), and O-/NH2- (16 amu). These fragments arise from either simple bond cleavages (e.g., (trp - H)(-)) or more complex reaction involving molecular rearrangements within the transitory negative ion (e.g., (HCO2)(-)). Surprisingly, by far the most predominant dissociation processes occur at sub-excitation energies (below the threshold of the electronic excitation). The present Letter may contribute to a better understanding of the initial molecular processes taking place during the interaction of radiation with living systems. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：497 / 502

页数：6

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