title: Water fragmentation and energy loss by carbon ions at the distal region of the Bragg peak.
abstract: Time-of-flight mass spectrometry was used to investigate fragmentation and energy transfer processes in water by C ions at the distal part of the Bragg peak. Measurements of the positive ion fragments from ionization, electron capture, electron loss, transfer-loss and loss-ionization channels have allowed us for the first time (a) to obtain a quantitative determination of the energy lost by C ions in water and (b) to show that total water fragment ion production has a much flatter profile with projectile energy than would be expected if the water radical formation was assumed to follow the energy-loss profile obtained from available stopping power models.
authors.affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528 Rio de Janeiro, 21945-970, RJ, Brazil.
authors.forename: E C
authors.initials: EC
authors.lastname: Montenegro
authors.forename: M B
authors.initials: MB
authors.lastname: Shah
authors.forename: H
authors.initials: H
authors.lastname: Luna
authors.forename: S W J
authors.initials: SW
authors.lastname: Scully
authors.forename: A L F
authors.initials: AL
authors.lastname: de Barros
authors.forename: J A
authors.initials: JA
authors.lastname: Wyer
authors.forename: J
authors.initials: J
authors.lastname: Lecointre
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004735:Energy Transfer; D007477:Ions; D013058:Mass Spectrometry / Q000379:methods; D011878:Radiotherapy; D014867:Water / Q000737:chemistry*
chemical_list: D007477:Ions; D014867:Water; D002244:Carbon