Ratio of double to single ionization of He by photon and charged particle impact
Conference
·
OSTI ID:199724
- Georgia State Univ., Atlanta, GA (United States)
The well-known relationship between ionization of atoms by fast charged particles and by photons, the Bethe-Born theory, is applied to the ratio of double ionization to single ionization of He, a process that has been under intense recent scrutiny. It is found that for sufficiently fast charged particles, this ratio for the single differential cross sections, differential in the energy transferred to the atom, {Delta}E, is equal to the photoionization ratio at a photon energy hv = {Delta}E, and this result is unmodified even for ionization by relativistic charged particles. In addition, a relation for the ratio of total charged particle impact ionization cross sections to the photoionization ratio is derived. The results are compared with recent experimental data and various discrepancies are uncovered. Possible sources of these discrepancies are discussed.
- OSTI ID:
- 199724
- Report Number(s):
- CONF-941129--
- Country of Publication:
- United States
- Language:
- English
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