Energy loss and dissociation of 10-MeV/amu H{sub 3}{sup +} ions in carbon foils
- Department of Engineering Science, Kyoto University, Kyoto, 606-01 (Japan)
Energy losses and fractions of H{sub 3}{sup +} and H{sub 2}{sup +} ions emerging from carbon foils of 1--8.5 {mu}g/cm{sup 2} thickness, after incidence of 9.6-MeV/amu H{sub 3}{sup +} ions, have been measured. From the decrease of the transmitted fraction of H{sub 3}{sup +} ions with increasing foil thickness, the dissociation cross section for 9.6-MeV/amu H{sub 3}{sup +} due to the H{sub 3}{sup +}-C collision has been determined to be (2.2{plus_minus}0.1){times}10{sup {minus}17} cm{sup 2}. Further, the potential energy of the H{sub 2}{sup +}+H{sup +} system has been derived from the energy spectra of the fragment H{sub 2}{sup +} ions, being 9.45{plus_minus}0.74 eV, with interproton separations being equal to those known for stable H{sub 3}{sup +} ions. For the stopping power of carbon for 9.6-MeV/amu H{sub 3}{sup +} ions a value of 83.3{plus_minus}5.5 eV/({mu}g/cm{sup 2}) has been obtained from the energy-loss data. This result corresponds to an effective charge of 1.45{plus_minus}0.09 for H{sub 3}{sup +} in carbon. The observed stopping power and the derived effective charge agree well with the values calculated by using the first-order Born approximation.
- OSTI ID:
- 44659
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 51; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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