HeH+体系光缔合反应的动力学研究

采用含时量子波包方法研究基电子态HeH⁺体系优化的光缔合几率，即He+H⁺→HeH⁺随碰撞粒子对初始动量的变化，并研究伴随该过程的多光子跃迁和解离.选取v=6振动能级为目标态，通过优化激光场参数得到碰撞粒子对的最优光缔合几率.结果表明：随着碰撞粒子对初始动量的增加，光缔合所用的最优激光场的持续时间逐渐减少，但光场的强度和失谐逐渐增加.在某些初始碰撞动量附近，由于共振多光子跃迁过程的存在，最优的光场不能严格地将碰撞粒子对缔合到目标态.此外，研究表明随着初始动量的增加，系统的超阈值解离几率近似线性地增加到一个最大值，直至饱和强度.并且，在碰撞粒子对的初始动量较大时，超阈值解离主导解离过程.

Wavepacket Dynamics Study of Photoassociation Reaction of HeH+ System

Optimal photoassociation (PA) reactions of He+H⁺→HeH⁺ in electronic ground state, together with relevant multiphoton transition and dissociation processes, are investigated with time-dependent quantum wavepacket method. Level v=6 is set to target state and optimal PA probability of this level is obtained by optimizing laser parameters. It is shown that with increase of initial collision momentum of collision pair optimal laser duration is decreasing, but laser intensity and detuning increasing. Due to resonance multiphoton transition process, other bound levels may be resided after PA process at some collision momenta. In addition, above threshold dissociation increases linearly up to a maximum, then decrease to a saturation value and dominates dissociation processes at relative greater initial collision momentum.