Multistep ionization of argon clusters in intense femtosecond extreme ultraviolet pulses
Multistep ionization of argon clusters in intense femtosecond extreme ultraviolet pulses
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DOI：
10.1103/physrevlett.100.133401
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发表时间：
2008-04-04
影响因子：
8.6
通讯作者：
Moeller, T.
中科院分区：
文献类型：
--
作者：
Bostedt, C.;Thomas, H.;Moeller, T.
利用光电子能谱和蒙特卡罗模拟方法研究了来自FLASH自由电子激光器（FEL）的强极紫外飞秒激光脉冲（λ =32.8 nm）与团簇的相互作用。当激光强度达到5 × 10(13) W/cm(2)时，我们发现团簇电离过程是在发展中的库仑场中的一系列直接电子发射事件。纳米等离子体只有在最高的研究功率密度下才会形成，在这种情况下，由于深簇电位，电离受到阻碍。与早期的红外和真空紫外光谱研究相比，我们没有发现等离子体加热过程中电子发射的证据。
The interaction of intense extreme ultraviolet femtosecond laser pulses (lambda=32.8 nm) from the FLASH free electron laser (FEL) with clusters has been investigated by means of photoelectron spectroscopy and modeled by Monte Carlo simulations. For laser intensities up to 5x10(13) W/cm(2), we find that the cluster ionization process is a sequence of direct electron emission events in a developing Coulomb field. A nanoplasma is formed only at the highest investigated power densities where ionization is frustrated due to the deep cluster potential. In contrast with earlier studies in the IR and vacuum ultraviolet spectral regime, we find no evidence for electron emission from plasma heating processes.