钨表面发射电子的阿秒拖尾模拟
Simulation of attosecond streaking of electrons emitted from a tungsten surface
摘要：
第一个时间分辨的光电发射实验，采用阿秒条纹的电子发射的XUV泵浦脉冲和探测的几个周期的NIR脉冲之间的时间延迟约100阿秒的光电子从导带和那些从4f核心水平的钨。我们提出了一个微观模拟的发射时间和能量谱采用经典的输运理论。发射光谱和条纹图像再现良好。延迟发射的核心电子的不同的贡献被确定：较大的发射深度，减慢非弹性散射过程，并可能，能量依赖的偏离自由电子色散。我们发现延迟时间接近实验数据的下限。
英文摘要：
First time-resolved photoemission experiments employing attosecond streaking of electrons emitted by an XUV pump pulse and probed by a few-cycle NIR pulse found a time delay of about 100 attoseconds between photoelectrons from the conduction band and those from the 4f core level of tungsten. We present a microscopic simulation of the emission time and energy spectra employing a classical transport theory. Emission spectra and streaking images are well reproduced. Different contributions to the delayed emission of core electrons are identified: larger emission depth, slowing down by inelastic scattering processes, and possibly, energy dependent deviations from the free-electron dispersion. We find delay times near the lower bound of the experimental data.
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