HeH^(2+)分子谐波辐射的空间分布  

Spatial distribution of molecular^harmonic generation from HeH^(2+)

作　　者：冯立强[1,2] 

机构地区：[1]辽宁工业大学理学院,锦州121001 [2]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《原子与分子物理学报》2017年第6期1103-1110,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11504151);辽宁省博士启动基金(201501123);辽宁省教育厅基金(L2014242)

摘　　要：理论研究了HeH^(2+)分子发射高次谐波的空间分布情况.结果表明:分子谐波发射主要集中在He核和H核附近.当核间距离较小时,He核辐射谐波强度要比H核辐射谐波强度高2~3个数量级.当核间距离较大时,He核辐射谐波强度要比H核辐射谐波强度高4~5个数量级.当空间非均匀激光场引入后,谐波截止能量得到延伸,并且,随着空间非均匀激光场位置由负向到正向移动(-100 a.u.到100a.u.),谐波截止得到进一步延伸.但是He核辐射谐波强度依然大于H核.最后,通过叠加谐波可获得脉宽在60 as的超短脉冲.Spatial distribution of the harmonic generation from HeH^2＋ has been theoretically investigated. It shows that the molecular harmonic emissions mainly occur around the He and the H nuclei. At smaller internuclear distance, the harmonic intensity from the He nucleus is 2 - 3 orders of magnitude higher than that from the H nucleus. At larger internuclear distance, harmonic intensity from the He nucleus is 4 - 5 orders of magnitude higher than that from the H nucleus. With the introduction of the spatial inhomogeneous laser field, the harmonic cutoff is extended. Moreover, as the spatial position of the inhomogeneous field moving from the -100 a. u. to the 100 a. u. , the harmonic cutoff can be further enhanced. But, the harmonic intensity from the He nucleus is still higher than that from the H nucleus. Finally, by properly selecting particular harmonics orders, an ultrashort 60 as pulse can be produced.

关 键 词：激光物理 HeH^2+分子 谐波空间分布 高次谐波 阿秒脉冲 

分 类 号：O562.4[理学—原子与分子物理]