Recoil collisions as a portal to field-assisted ionization at near-uv frequencies in the strong-field double ionization of helium
Recoil collisions as a portal to field-assisted ionization at near-uv frequencies in the strong-field double ionization of helium
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DOI：
10.1103/physreva.78.023411
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发表时间：
2008-08-01
影响因子：
2.9
通讯作者：
Emmanouilidou, A.
中科院分区：
文献类型：
--
作者：
Emmanouilidou, A.
我们探讨了在保持质能恒定的情况下，He原子的双电离与强激光场频率的关系。当我们增加频率时，我们发现最近在ω =0.055 a.u.时发现的高动量的显着“指状”结构在更高的频率下仍然存在。同时，在ω =0.187 a.u时，小动量在相关动量分布中出现了新的x形结构。讨论了这种结构作为非顺序双电离频率依赖特征的作用。
We explore the dependence of the double ionization of the He atom on the frequency of a strong laser field while keeping the ponderomotive energy constant. As we increase the frequency we find that the remarkable "fingerlike" structure for high momenta recently found for omega=0.055 a.u. persists for higher frequencies. At the same time, at omega=0.187 a.u., a new X-shaped structure emerges for small momenta that prevails in the correlated momenta distribution. The role of this structure as a signature of the frequency dependence of nonsequential double ionization is discussed.