Differential Double Ionization of He by Compton Photons and Charged Particles at Large Energy Transfers

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.1723· OSTI ID:383298

Wang, J; McGuire, J H ^[1]; Burgdoerfer, J; Qiu, Y ^[2]

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1. Department of Physics, Tulane University, New Orleans, Louisiana 70118 (United States)
2. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)

Double ionization of helium differential in energy transfer, {epsilon}, is studied for both high-energy Compton photons and charged particles. The ratios of double to single ionization, {ital R}{sub {ital C}}({epsilon}) for Compton scattering, and {ital R}{sub {ital Z}}({epsilon}) for charged particles, are found to display an unexpected behavior: For large {epsilon} up to the two-body binary encounter (BE) limit, {epsilon}{sub BE}, we find {ital R}{sub {ital C}}({epsilon})={ital R}{sub {ital Z}}({epsilon}){approx_equal}0.86{percent} in good agreement with recent experimental data. For even larger {epsilon}{approx_gt}{epsilon}{sub BE}, {ital R}{sub {ital C}}({epsilon}) and {ital R}{sub {ital Z}}({epsilon}) are modified by an {open_quote}{open_quote}exchange shakeoff{close_quote}{close_quote} mechanism. At {epsilon}{gt}{epsilon}{sub BE}{gt}1, both differential (unlike integrated) ratios are predicted to approach the photoionization limit. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 383298
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGED PARTICLES
COMPTON EFFECT
ENERGY TRANSFER
HELIUM
IONIZATION
PHOTOIONIZATION
PHOTONS
SCATTERING