Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
Phys Rev Lett. 2010 Sep 10;105(11):113003. doi: 10.1103/PhysRevLett.105.113003. Epub 2010 Sep 7.
Using a semiclassical model which incorporates tunneling and Coulomb field effects, the origin of the low-energy structure (LES) in the above-threshold ionization spectrum observed in recent experiments [Blaga, Nature Phys. 5, 335 (2009); Quan, Phys. Rev. Lett. 103, 093001 (2009).] is identified. We show that the LES arises due to an interplay between multiple forward scattering of an ionized electron and the electron momentum disturbance by the Coulomb field immediately after the ionization. The multiple forward scattering is mainly responsible for the appearance of LES, while the initial disturbance mainly determines the position of the LES peaks. The scaling laws for the LES parameters, such as the contrast ratio and the maximal energy, versus the laser intensity and wavelength are deduced.
利用包含隧穿和库仑场效应的半经典模型，确定了最近实验中观察到的阈上电离光谱中的低能结构（LES）的起源[Blaga，自然物理 5,335（2009）；Quan，物理评论快报 103,093001（2009）]。我们表明，LES 是由于电离电子的多次前向散射和电离后立即由库仑场引起的电子动量干扰之间的相互作用产生的。多次前向散射主要负责 LES 的出现，而初始干扰主要决定 LES 峰值的位置。推导出 LES 参数（例如对比度比和最大能量）与激光强度和波长的标度律。
