ELECTRON-ENERGY AND ELECTRON-ANGULAR DISTRIBUTIONS IN THE DOUBLE PHOTOIONIZATION OF HELIUM

被引：145

作者：

WEHLITZ, R

HEISER, F

HEMMERS, O

LANGER, B

MENZEL, A

BECKER, U

机构：

[1] Fritz-Huber-Institut, Max-Planck-Gesellschaft, W-1000 Berlin 33

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 27期

关键词：

D O I：

10.1103/PhysRevLett.67.3764

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Photoelectron spectra of helium have been measured at different angles and at various photon energies above the double-ionization threshold up to 120 eV to investigate the behavior of the energy and angular distributions of shake-off electrons. Both energy and angular distributions clearly show a U-shaped profile which turns to a flat curve near threshold pointing to a uniform intensity distribution over the kinetic energy for all angles in this excitation energy regime. Our results for the angular-distribution asymmetry parameter indicate qualitative agreement with theoretical predictions but fail to prove them quantitatively.

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页码：3764 / 3767

页数：4

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