TITLE

Interactions of neutral and singly charged keV atomic particles with gas-phase adenine molecules

AUTHOR(S)
Alvarado, Fresia; Bari, Sadia; Hoekstra, Ronnie; Schlathölter, Thomas
PUB. DATE
July 2007
SOURCE
Journal of Chemical Physics;7/21/2007, Vol. 127 Issue 3, p034301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
KeV atomic particles traversing biological matter are subject to charge exchange and screening effects which dynamically change this particle’s effective charge. The understanding of the collision cascade along the track thus requires a detailed knowledge of the interaction dynamics of radiobiologically relevant molecules, such as DNA building blocks or water, not only with ionic but also with neutral species. We have studied collisions of keV H+, He+, and C+ ions and H0, He0, and C0 atoms with the DNA base adenine by means of high resolution time-of-flight spectrometry. For H0 and H+ we find qualitatively very similar fragmentation patterns, while for carbon, strong differences are observed when comparing C0 and C+ impact. For collisions with He0 and He+ projectiles, a pronounced delayed fragmentation channel is observed, which has not been reported before.
ACCESSION #
25906359

 

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