HF和DF分子双光子布居转移过程中的同位素效应

Isotope Effects on Two-Photon Population Transfer Processes of HF and DF

通过求解含时薛定谔方程，研究TXF（X=H，D）分子体系双光子共振条件下布居转移过程中的同位素效应．对于这两个分子体系，基电子态上的振动能级v=O和v=2被考虑成幸刀始态和目标态．详细讨论了激光场峰值强度和脉冲持续时间对布居转移过程的影响．脉冲持续时间需要长于860fs才能保证DF分子体系可以获得较为显著的布居转移几率（大于80％），而对于HF分子体系，该参数只需长于460fs．与HF分子体系相比，中间态v=1和较高的v=3振动态会对DF分子体系的双光子共振布居转移过程产生更重要的影响．

The isotope effects of XF （X=H, D） on the population transfer process via two-photon resonance excitation are investigated by solving the time-dependent SchrSdinger equation. The vibrational levels v=0 and 2 of the ground electronic state are taken to be the initial and target states, respectively, for the two molecular systems. The influences of the field peak amplitude and pulse duration on the population transfer process are discussed in detail. The pulse duration is required to be longer than 860 fs for the DF molecule to achieve a relatively high transfer probability （more than 80%）, while the one for the HF molecule is just required to be longer than 460 fs. Moreover, the intermediate level v=1 and the higher level v=3 may play more important roles in the two-photon resonance process for the DF molecule, compared to the roles in the process for the HF molecule.