MEASUREMENT OF THE RATIO OF DOUBLE-TO-SINGLE PHOTOIONIZATION OF HELIUM AT 2.8 KEV USING SYNCHROTRON RADIATION

被引：88

作者：

LEVIN, JC

LINDLE, DW

KELLER, N

MILLER, RD

AZUMA, Y

MANSOUR, NB

BERRY, HG

SELLIN, IA

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831

[2] NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899

[3] ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.67.968

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first measurement of the ratio of double-to-single photoionization of helium well above the double-ionization threshold. Using a time-of-flight technique, we find He++/He+ = 1.6% +/- 0.3% at hv = 2.8 keV. This value lies between calculations by Amusia (2.3%) and by Samson, who predicts 1.2% by analogy with electron-impact ionization cross sections of singly charged ions. Good agreement is obtained with older shake calculations of Byron and Joachain, and of Aberg, who predict 1.7%.

引用

页码：968 / 971

页数：4

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