Journal articles
Mass spectrometry (fragmentation ratios) of DNA base molecules following 80 keV proton impact with separation of direct ionization and electron capture processes
Abstract : The first fragmentation ratios are presented for the ionization and dissociative ionization of gas-phase DNA bases following 80 keV (1.8 v0) proton impact. Event-by-event determination of the projectile charge state after collision enables also to distinguish the relative contributions of electron capture (EC) by the projectile from direct ionization (DI) of the target molecule (without projectile neutralization) thus yielding branching rations for these two different ionization processes. Results have been compared with recent similar experiments on uracil [Tabet et al. unpublished] and water [Gobet et al. Phys. Rev. A 70 (2004) 062716]. Although in all cases both processes (EC and DI) produced the same fragment ion groups in the mass spectra, fragmentation is for EC larger than for DI. Moreover the fragmentation ratio for dissociative ionization was observed to be for thymine larger than for adenine, cytosine, and uracil.
Cited literature [22 references]
http://hal.in2p3.fr/in2p3-00420084
Contributor : Dominique Girod <>
Submitted on : Monday, September 28, 2009 - 10:29:23 AM
Last modification on : Tuesday, November 19, 2019 - 2:38:48 AM
Long-term archiving on: : Wednesday, June 16, 2010 - 12:09:27 AM
Contributor : Dominique Girod <>
Submitted on : Monday, September 28, 2009 - 10:29:23 AM
Last modification on : Tuesday, November 19, 2019 - 2:38:48 AM
Long-term archiving on: : Wednesday, June 16, 2010 - 12:09:27 AM
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DNA-SM-2009.pdf
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