Effects of orientation and alignment in high-order harmonic generation and above-threshold ionization

被引：19
|
作者：
Madsen, C. B. [1 ]
Mouritzen, A. S. [1 ]
Kjeldsen, T. K. [1 ]
Madsen, L. B. [1 ]
机构：
[1] Aarhus Univ, Dept Phys & Astron, Lundbeck Fdn, Theoret Ctr Quantum Syst Res, DK-8000 Aarhus C, Denmark
来源：
PHYSICAL REVIEW A | 2007年 / 76卷 / 03期
关键词：
D O I：
10.1103/PhysRevA.76.035401
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
When molecules interact with light sources of femtosecond or shorter duration the rotational degrees of freedom are frozen during the response to the strong nonperturbative interaction. We analytically derive how the frozen degrees of freedom affect the measurable signals in high-order harmonic generation and above-threshold ionization. High-order harmonic generation exhibits optical coherence in the signal from different orientations of the molecule. For ionization, the contributions from different orientations are added incoherently. The consequences of these findings are illustrated by numerical results.
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页数：4
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