THE RATIO OF CROSS-SECTIONS FOR DOUBLE TO SINGLE IONIZATION OF HELIUM BY HIGH-ENERGY PHOTONS AND CHARGED-PARTICLES

被引：175
作者：
MCGUIRE, JH
BERRAH, N
BARTLETT, RJ
SAMSON, JAR
TANIS, JA
COCKE, CL
SCHLACHTER, AS
机构：
[1] WESTERN MICHIGAN UNIV,DEPT PHYS,KALAMAZOO,MI 49008
[2] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545
[3] UNIV NEBRASKA,DEPT PHYS,LINCOLN,NE 68588
[4] KANSAS STATE UNIV AGR & APPL SCI,DEPT PHYS,MANHATTAN,KS 66506
[5] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB MS 2400,BERKELEY,CA 94720
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1995年 / 28卷 / 06期
关键词：
D O I：
10.1088/0953-4075/28/6/009
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Data and analysis for the ratio of double to single ionization in helium is reviewed for impact by photons and charged particles. In the case of photoionization there are two processes, namely, (i) photoionization where the photon is annihilated, and (ii) Compton scattering where the photon is inelastically scattered. In the case of charged particle scattering the ratio of total cross sections tends toward an asymptotic high energy value of 0.26% which is well below the value observed for photons of 1.7% at photon energies between 2 and 12 keV. Theoretical relations between various ratios have been predicted and to some extent confirmed by observations.
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页码：913 / 940
页数：28
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