Few-cycle attosecond pulse chirp effects on asymmetries in ionized electron momentum distributions
Few-cycle attosecond pulse chirp effects on asymmetries in ionized electron momentum distributions
复制标题
少周期阿秒脉冲啁啾对电离电子动量分布不对称性的影响
DOI：
10.1103/physreva.80.013407
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发表时间：
2009-07
影响因子：
2.9
通讯作者：
Gong, Qihuang
中科院分区：
文献类型：
--
作者：
Tan, Fang;Pronin, Evgeny A.;Peng, Liang-You;Starace, Anthony F.;Gong, Qihuang
通过数值求解含时薛定谔方程，研究了几周期啁啾阿秒脉冲作用下H原子电离电子的动量分布。脉冲的中心载波频率选择为25 eV，远高于电离阈值。发现电子沿沿着和相反于线性激光偏振方向电离的产率的不对称性（或差异）对脉冲啁啾（对于具有固定载波包络相位的脉冲）非常敏感，对于固定的电子能量和能量积分产率都是如此。特别地，脉冲啁啾越大，作为电离电子能量的函数的不对称性改变符号的次数越大。对于一个固定的啁啾，电离电子的不对称性被发现是敏感的载波包络相位的几个周期的脉冲。
The momentum distributions of electrons ionized from H atoms by chirped few-cycle attosecond pulses are investigated by numerically solving the time-dependent Schroedinger equation. The central carrier frequency of the pulse is chosen to be 25 eV, which is well above the ionization threshold. The asymmetry (or difference) in the yield of electrons ionized along and opposite to the direction of linear laser polarization is found to be very sensitive to the pulse chirp (for pulses with fixed carrier-envelope phase), both for a fixed electron energy and for the energy-integrated yield. In particular, the larger the pulse chirp, the larger the number of times the asymmetry changes sign as a function of ionized electron energy. For a fixed chirp, the ionized electron asymmetry is found to be sensitive also to the carrier-envelope phase of the few-cycle pulse.