Multiphoton ionization of He by using intense high-order harmonics in the soft-x-ray region
Multiphoton ionization of He by using intense high-order harmonics in the soft-x-ray region
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DOI：
10.1103/physreva.71.023407
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发表时间：
2005-02
影响因子：
2.9
通讯作者：
H. Hasegawa;E. Takahashi;Y. Nabekawa;K. Ishikawa;K. Midorikawa
中科院分区：
文献类型：
--
作者：
H. Hasegawa;E. Takahashi;Y. Nabekawa;K. Ishikawa;K. Midorikawa
我们报道了软X射线区({lambda}{<；=}30 nm)的多光子电离过程。根据用高次谐波产生的强软X射线脉冲测量的离子和电子的飞行时间谱，估算了He的双光子双电离和阈值以上电离的截面。通过位相匹配的高次谐波获得的高强度软X射线辐射使得研究这些传统光源无法企及的非线性光学过程成为可能。
We report on the multiphoton ionization processes in the soft-x-ray region ({lambda}{<=}30 nm). On the basis of the measured time-of-flight spectra for both ions and electrons obtained using intense soft-x-ray pulses produced by high-order harmonics, the cross sections of the two-photon double ionization and above-threshold ionization of He are estimated. The high-intensity soft-x-ray radiation achieved by phase-matched high-order harmonics enables the investigation of these nonlinear optical processes, which were beyond the reach of conventional light sources.