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.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2007
- DOI:
- 10.1103/PhysRevLett.99.213201
- Bibcode:
- 2007PhRvL..99u3201M
- Keywords:
-
- 34.50.Gb;
- 34.50.Bw;
- 34.70.+e;
- 87.50.-a;
- Electronic excitation and ionization of molecules;
- intermediate molecular states;
- Energy loss and stopping power;
- Charge transfer;
- Effects of radiation and external fields on biomolecules cells and higher organisms