Alignment of the Angular Momenta of Products as a Probe of the Transition State of Chemical Reactions

这笔实验物理化学拨款支持理查德·伯森教授在光解动力学领域的研究。光解动力学的重要性在于它使我们能够了解化学反应的方式和速度。所描述的研究是创新的，在理论上得到了很好的支持，并可能改变其他研究人员对化学反应进化的看法。这项研究涉及反应A+BC=AB+C，这将通过使用排列的原子A来研究，以研究原子A的排列将在多大程度上传播到产物AB和C的角动量的排列以及它们的相对速度的各向异性。A，待研究的例子包括汞、Cs、H和F。BC的例子包括氢气、盐酸和碘气。反应物的排列在产物中的反映程度是过渡态的对称性和过渡态络合物寿命的量度。反应物原子的排列(磁子能级上的不均匀分布)是通过线偏振光激发实现的。将研究这一基本反应及其逆过程，在该过程中，反应物的各向异性相对速度产生产物的排列。

This grant in Experimental Physical Chemistry supports the research of Professor Richard Bersohn in the field of photodissociation dynamics. The importance of photodissociation dynamics is that it enables us to understand how and how fast chemicals react. The research described is innovative, well supported theoretically, and may change the way other researchers think about the evolution of chemical reactions. The research involves the reaction A+BC=AB+C, which will be studied by using aligned atoms A to study the extent to which the alignment of an atom A will be propagated into alignment of the angular momenta of the products AB and C and the anisotropy of their relative velocity. Examples of A, to be studies include Hg, Cs, H and F. Examples of BC include hydrogen gas, HCl and iodine gas. The degree to which the alignment of the reactants is reflected in the products is a measure of the symmetry of the transition state and the lifetime of the transition state complex. Alignment of reactant atoms (unequal distribution over magnetic sublevels) is accomplished by excitation with linearly polarized light. This elementary reaction will be studied as well as its inverse process in which the anisotropic relative velocity of the reactants produces alignment of the products.