论文标题
h $ _2 $的强场非弗朗克 - 康登电离：半古典分析
Strong Field Non-Franck-Condon Ionization of H$_2$: A Semi-Classical Analysis
论文作者
论文摘要
h $ _2 $分子的单电离暴露于强激光脉冲和短激光脉冲中，通过半经典方法研究。考虑了三个激光特性：i）载波频率对应于覆盖和桥接两个电离状态的波长：从800 nm处的隧道电离（Ti）到266 nm时多光子电离（MPI）。 ii）在窗口中选择峰值强度的值，以消除竞争性的双电离过程。 iii）特别关注激光场的极化，该激光场可以线性或圆形极化。结果及其解释涉及两个可观察到的物品，即渗透结束的总电离概率和阳离子h $ _2^+$中产生的振动分布。最突出的发现是，圆形极化的电离效率和阳离子的振动分布提高了，比在垂直（Franck-condon）电离中填充的阳离子有利于较低的水平，从而导致非弗兰克 - 康登分布在线性和圆形方向上。
Single ionization of H$_2$ molecules exposed to strong and short laser pulses is investigated by a semi-classical method. Three laser characteristics are considered: i) The carrier-wave frequency corresponds to wavelengths covering and bridging the two ionization regimes: From tunnel ionization (TI) at 800 nm to multiphoton ionization (MPI) at 266 nm. ii) Values of the peak intensity are chosen within a window to eliminate competing double ionization processes. iii) Particular attention is paid to the polarization of the laser field, which can be linearly or circularly polarized. The results and their interpretation concern two observables, namely the end-of-pulse total ionization probability and vibrational distribution generated in the cation H$_2^+$. The most prominent findings are an increased ionization efficiency in circular polarization and a vibrational distribution of the cation that favors lower-lying levels than those that would be populated in a vertical (Franck-Condon) ionization, leading to non Franck-Condon distributions, both in linear and circular polarizations.
