Kienberger R, Hentschel M, Uiberacker M, Spielmann Ch, Kitzler M, Scrinzi A, Wieland M, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Drescher M, Krausz F
Institut für Photonik, Technische Universität Wien, Gusshausstr. 27, A-1040 Wien, Austria.
Science. 2002 Aug 16;297(5584):1144-8. doi: 10.1126/science.1073866. Epub 2002 Jul 11.
Photoelectrons excited by extreme ultraviolet or x-ray photons in the presence of a strong laser field generally suffer a spread of their energies due to the absorption and emission of laser photons. We demonstrate that if the emitted electron wave packet is temporally confined to a small fraction of the oscillation period of the interacting light wave, its energy spectrum can be up- or downshifted by many times the laser photon energy without substantial broadening. The light wave can accelerate or decelerate the electron's drift velocity, i.e., steer the electron wave packet like a classical particle. This capability strictly relies on a sub-femtosecond duration of the ionizing x-ray pulse and on its timing to the phase of the light wave with a similar accuracy, offering a simple and potentially single-shot diagnostic tool for attosecond pump-probe spectroscopy.
在强激光场存在的情况下，由极紫外或X射线光子激发的光电子通常会由于激光光子的吸收和发射而使其能量发生展宽。我们证明，如果发射的电子波包在时间上被限制在相互作用光波振荡周期的一小部分内，其能谱可以向上或向下移动许多倍激光光子能量，而不会有实质性展宽。光波可以加速或减速电子的漂移速度，即像经典粒子一样操控电子波包。这种能力严格依赖于电离X射线脉冲的亚飞秒持续时间及其与光波相位的类似精度的定时，为阿秒泵浦-探测光谱学提供了一种简单且可能单次使用的诊断工具。
