Laser-Induced Chemical Reactions and Energy Transfer

对几种不同物理条件下分子碰撞体系和化学反应中激光诱导的能量传递进行了理论研究。涉及半经典和量子力学散射理论的计算将在以下项目中进行：(1)激光诱导稀有气体原子和卤素分子之间的气相双分子反应，其中非共振激光脉冲激发范德华络合物，导致电子激发产物的形成。(2)操纵超短激光脉冲以确定碰撞事件的结果。(3)格栅附近分子的光解离，包括预解离的特殊情况。还考虑了邻近分子的影响和可能的激光辅助多相催化。(4)激光在固体-稀有气体基质中的反应，以确定势能面和卤素与稀有气体原子之间的反应。这是一项基础理论研究，旨在了解激光脉冲如何导致特定化学反应发生的细节。通过改变激光波长来控制化学反应结果的可能性取决于这样的理解；本研究旨在实现这一目标。

Theoretical studies are proposed for laser-induced energy transfer in molecular collision systems and chemical reactions under several different kinds of physical conditions. Calculations involving semiclassical and quantum-mechanical scattering theory will be undertaken on the following projects: (1) Laser-induced gas-phase bimolecular reactions between a rare gas atom and a halogen molecule, in which a non-resonant laser pulse excites the van der Waals complex, leading to the formation of an electronically excited product. (2) Manipulation of ultrashort laser pulses to determine the outcome of a collision event. (3) Photodissociation of a molecule near a grating, including the particular case of predissociation. Effects due to neighboring molecules and possible laser-assisted heterogeneous catalysis are also considered. (4) Laser-induced reactions in a solid-rare gas matrix to determine potential energy surfaces and reactions between halogen and rare-gas atoms. This is a fundamental theoretical study directed towards understanding the details of how a pulse of laser light can cause particular chemical reactions to occur. The possibility of controlling the outcomes of chemical reactions by varying the wavelength of the laser light depends on such an understanding; the present studies are directed to this end.