Abstract
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), HCO 2 - (45 amu), CN − (26 amu), OH − (17 amu), and O - / NH 2 - (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., (HCO 2) −). 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.
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