Inelastic interactions of protons and electrons with biologically relevant molecules |
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Authors: | B. Coupier B. Farizon M. Farizon M.J. Gaillard F. Gobet N.V. de Castro Faria G. Jalbert S. Ouaskit M. Carré B. Gstir G. Hanel S. Denifl L. Feketeova P. Scheier T.D. Märk |
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Affiliation: | Institut de Physique Nucléaire de Lyon, IN2P3-CNRS et Université Claude Bernard, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France, FR Laboratoire de Spectrométrie Ionique et Moléculaire, CNRS et Université Claude Bernard, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France, FR Institut für Ionenphysik, Leopold Franzens Universit?t, Technikerstr. 25, 6020 Innsbruck, Austria, AT
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Abstract: | Ionization and fragmentation of water and uracil molecules was studied both by electron and proton impact. A special coincidence technique allows on an event by event basis the investigation of product ions formed upon the collision of protons with neutral molecules including the identification of the charge state of the projectile. This enables the characterization of the ionization processes occurring, i.e. direct ionization, single electron capture or double electron capture for 0, 1 or 2 electrons that are transferred from the target to the projectile, respectively. For uracil the fragmentation patterns obtained by electron and proton impact ionization reveal close similarities and indicate a comparable amount of excitation for the two different ionization mechanisms at high enough projectile energies. Received 25 February 2002 Published online 13 September 2002 |
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Keywords: | PACS. 87.50.Gi Ionizing radiations (ultraviolet, X-rays, γ -rays, ions, electrons, positrons, neutrons, and mesons, etc.) – 87.14.Gg DNA, RNA – 34.50.Gb Electronic excitation and ionization of molecules intermediate molecular states (including lifetimes, state mixing, etc.) |
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