中国物理B ›› 2013, Vol. 22 ›› Issue (3): 33203-033203.doi: 10.1088/1674-1056/22/3/033203
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
王俊a, 陈高b, 郭福明a, 李苏宇a, 陈基根c, 杨玉军a
Wang Jun (王俊)a, Chen Gao (陈高)b, Guo Fu-Ming (郭福明)a, Li Su-Yu (李苏宇)a, Chen Ji-Gen (陈基根)c, Yang Yu-Jun (杨玉军)a
摘要: We theoretically investigate the high-order harmonic generation from H2+ in an infrared laser field. Our numerical simulations show that there exists a highly efficient plateau structure in the molecular harmonic spectrum. Under the action of the infrared laser pulse, the bound electronic wave packet in a potential well has enough time to tunnel through the effective potential barrier, which is formed by the molecular potential and the infrared laser field, and then recombine with the neighboring nucleus emitting a harmonic photon. During the entire dynamic process, because the wave packet is mainly located in the effective potential, the diffusion effect is of no significance, and thus a highly efficient harmonic plateau can be achieved. Specifically, the cut-off frequency of the plateau is linearly scaled with the peak amplitude of the infrared laser electric field, which may open another route to examine the internuclear distance of the molecule. Furthermore, one may detect the molecular bond lengths using the harmonic plateau.
中图分类号: (Multiphoton ionization and excitation to highly excited states)