Journal
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Volume 292, Issue 1-3, Pages 53-63Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijms.2010.03.002
Keywords
DNA bases; Proton impact; Ionization; Electron capture; Mass spectrometry
Funding
- French
- EU Commission (Brussels)
- CNRS-CNRST [17689]
- FP6 Marie Curie Fellowship
- EPSRC
- Austrian
- Moroccan governments
- EPSRC [EP/E039618/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E039618/1] Funding Source: researchfish
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The first fragmentation ratios are presented for the ionization of gas-phase DNA bases by 80 keV (1.8 vs in Bohr velocity units) proton impact. Event-by-event determination of the projectile charge state post-collision enables branching ratios to be determined for electron capture (EC) by the projectile and for direct ionization (D1) of the target molecule (without projectile neutralization). Results are compared with similar experiments on uracil [11] and water [14]. In all cases, whereas both processes (EC and DI) produce the same fragment ion groups, greater fragmentation ratios are observed for EC than for DI. Moreover the fragmentation ratio is greater for thymine than for adenine, cytosine, and uracil. (C) 2010 Elsevier B.V. All rights reserved.
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