Generation of below-threshold even harmonics by a stretched H2+ molecular ion in intense linearly and circularly polarized laser fields

被引:18
作者
Avanaki, K. Nasiri [1 ]
Telnov, Dmitry A. [2 ]
Jooya, H. Z. [1 ]
Chu, Shih-I [1 ,3 ]
机构
[1] Univ Kansas, Dept Chem, Lawrence, KS 66045 USA
[2] St Petersburg State Univ, Dept Phys, St Petersburg 199034, Russia
[3] Natl Taiwan Univ, Dept Phys, Ctr Quantum Sci & Engn, Taipei 10617, Taiwan
来源
PHYSICAL REVIEW A | 2015年 / 92卷 / 06期
关键词
SPECTRA; ELLIPTICITY; IONIZATION; FREQUENCY; ELECTRON; DRIVEN; PULSES;
D O I
10.1103/PhysRevA.92.063811
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We explore the mechanism of below-threshold even-harmonic generation of the H-2(+) molecular ion subject to intense near-infrared linearly and circularly polarized laser fields. The task is accomplished by accurate treatment of the time-dependent Schrodinger equation in prolate spheroidal coordinates within the generalized pseudospectral formalism. Even harmonics are detected in the harmonic spectra of stretched molecules, mostly with the internuclear separations of 5 to 9 a.u. Consecutive dynamic localization of the electron density near each of the nuclei is responsible for the broken inversion symmetry, which in turn leads to emission of low-order even harmonics. An intuitive picture of the process is provided by the analysis of the time evolution of the electron density and time-frequency spectra of the dipole acceleration. A clear theoretical explanation of the phenomenon is given within the Floquet formalism.
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页数:8
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