Photodetachment cross sections of the C2nH- (n=1-3) hydrocarbon-chain anions

被引：14

作者：

Douguet, Nicolas ^{[1
]}

Kokoouline, Viatcheslav ^{[2
]}

Orel, Ann E. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[2] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

来源：

PHYSICAL REVIEW A | 2014年 / 90卷 / 06期

基金：

美国国家科学基金会;

关键词：

AB-INITIO CHARACTERIZATION; KOHN VARIATIONAL METHOD; EXCITED-STATES; NEGATIVE-IONS; ASTRONOMICAL IDENTIFICATION; CIRCUMSTELLAR ENVELOPES; PHOTOELECTRON-SPECTRA; INTERSTELLAR CLOUDS; ELECTRONIC STATES; C4H;

D O I：

10.1103/PhysRevA.90.063410

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report theoretical results of the low-energy photodetachment cross sections of the C2H-, C4H-, and C6H- hydrocarbon-chain anions. The complex Kohn variational technique is used to calculate molecular-frame transition dipole moments from the anion ground state to a photoelectron in the continuum of the neutral radical. We employ the Franck-Condon approximation and include interchannel electronic coupling to determine the low-energy photodetachment cross sections and asymmetry parameters. We discuss the behavior of the cross section, especially near thresholds, and describe the role of electronic resonances and excited channels. The theoretical results reproduce the main characteristics of recent measurements of absolute photodetachment cross sections.

引用

页数：11

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