Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge  

作　　者：唐增华 李永庆 马凤才 

机构地区：[1]Department of Physics, Liaoning University

出　　处：《Chinese Physics B》2013年第8期429-433,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11274149);the Natural Science Foundation of Liaoning Province,China(Grant No.20121032)

摘　　要：We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.

关 键 词：strong-field approximation gauge invariance tunnel ionization 

分 类 号：Q682[生物学—生物物理学]