光缔合过程中多光子振转态选择性跃迁

研究了光缔合过程中OH分子基电子态的振转态选择性跃迁. 计算结果表明通过选择适当的初始碰撞能与光场参数，两碰撞原子可以利用三光子、四光子与九光子跃迁，从连续态跃迁至目标态. 通过选取较低的光场频率，增加跃迁至目标态的光子数来控制分子布居跃迁至较低的振转态. 在光缔合过程中, 部分缔合的分子通过中间态与背景态重新发生解离，解离过程降低了目标态的布居分布.

Rovibrational State-Selectivity in Photoassociation through Multi-photon Transitions

The rovibrational state-selectivity in photoassociation （PA） is investigated for the ground electronic state of OH radical. The calculated results show that population can be transferred from continuum state to the target states through three-, four-, and nine-photon transitions by choosing suitable pulse parameters and initial collision energy. To control population transfer to a lower rovibrational state, a shorter pulse frequency has to be chosen and the photon number transferred to target state should be increased. In PA process, some associated OH radicals can be dissociated via intermediate and background states, which decreases the nal population of the target state.