From Atoms to Molecules
From Atoms to Molecules
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从原子到分子
DOI：
10.1007/978-3-662-08492-2_14
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Bräuning
中科院分区：
文献类型：
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作者：
R. Dörner;H. Schmidt;V. Mergel;T. Weber;L. Spielberger;O. Jagutzki;A. Knapp;H. Bräuning
在本章中，我们讨论单光子吸收（第14.2节）和康普顿散射（第14.3节）的直接光双电离。我们不讨论密切相关的两步过程的多重电离现象，如光电离后的单俄歇或多俄歇衰变。我们集中讨论两个最基本的双电子靶系统：氦原子（第14.2和14.3节）和氢分子（氘）（第14.4节）。氦的光双电离是一个成熟的研究领域，近十年来在实验和理论方面都取得了令人印象深刻的突破。本书的第三部分描述了理论进展，因此我们在这里将自己限制为对物理现象的现象学描述和直观解释。相比之下，对于分子中的双电子过程问题，实验学家和理论家面临的主要挑战还在前面。
In the present chapter, we discuss direct photo double ionization by singlephoton absorption (Sect. 14.2) and Compton scattering (Sect. 14.3). We do not discuss the closely related phenomenon of multiple ionization by two-step processes such as photoionization followed by single- or multiple-Auger decay. We concentrate on the two most fundamental two-electron target systems: the helium atom (Sects. 14.2 and 14.3) and molecular hydrogen (deuterium) (Sect. 14.4). The subject of photo double ionization of helium is now a mature field in which an impressive experimental and theoretical breakthrough has been achieved in the previous 10 years. The theoretical progress is described in Part III of this book, we therefore restrict ourselves here to a phenomenological description and intuitive interpretation of the physical phenomena. For the problem of two-electron processes in molecules, in contrast, the major challenges for experimentalist and theoretician still lie ahead.