Effect of Compton scattering on the ratio of double to single photoionization of helium

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281495

Sagurton, M; Samson, J A.R.; He, Z X; Bartlett, R J ^[1]

---

1. Los Alamos National Lab., NM (United States)

A number of recent measurements and theoretical studies of the ratio of double to single ionization of Helium have concentrated on the asymptotic value of this ratio. However, none of the calculations have addressed the effect of Compton scattering on the ratio nor are the published data of sufficient statistical accuracy to delineate the effect. Based on the cross sections for photoionization and for Compton scattering it is expected that Compton scattering will contribute to the single ionization for photon energies greater than {approximately}2.5 keV and to both single and double ionization for energies greater than {approximately}4.5 keV. In fact, it will be the dominate contributor for photon energies greater than {approximately}6 keV. We will discuss these effects and present measurements of the double to single ionization ratio in the photon energy range where the energy transferred by the Compton scattering is sufficient to cause ionization.

• OSTI ID: 281495
• Report Number(s): CONF-9305421--; CNN: Grant PHY-9017248
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COMPTON EFFECT
CROSS SECTIONS
HELIUM
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS