ELECTRIC-DIPOLE MOMENTS OF IMPACT-EXCITED HE ATOMS

被引：18

作者：

AYNACIOGLU, AS

HEUMANN, S

VONOPPEN, G

机构：

[1] Institut F̈r Strahlungs- und Kernphysik, Technische Universität Berlin

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.64.1879

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We excited helium atoms using 1020-keV H2+ (D2+) ion impact and investigated the intensity of the (43D-23P)=447 nm line as a function of an electric field -2 kV/cm +2 kV/cm applied antiparallel and parallel to the ion beam. The recorded signals were strongly asymmetric with respect to the sign of the electric field. This asymmetry is explained by assuming a coherent excitation of He levels with different angular momenta (4d,4f and 5f,5g). These measurements demonstrate that angular momentum coherences of impact-excited states can also be observed in nonhydrogenic systems. © 1990 The American Physical Society.

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页码：1879 / 1882

页数：4

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