报告题目：A different perspective on the quantum theory of reactions

报 告 人：Bo Gao, University of Toledo

报告时间：12月22日（周四）16:00

报告地点：郑裕彤讲堂

报告摘要：In conventional quantum theories of reactions, little can be known about a reaction without a detailed knowledge of the potential energy surface (PES), the accuracy of which is often insufficient for quantitative predications. This difficulty, coupled with the exponential growth of the Hilbert space beyond two-body, has limited the conventional theories to a few simple systems such as D+H2, with little hope for more complex systems. Motivated by a recent landmark experiment by the JILA group, a multichannel quantum-defect theory for reactions (MQDTR) has been developed that offers a substantially different perspective. It asserts that much can be known about a quantum system simply from the types of long-range interactions among its constituents. Whatever not yet known can be characterized by a few energy insensitive parameters, which can be further determined from a few experimental measurements without any knowledge of the short-range interaction, or even the strength of the long range interaction. Such a paradigm frees the theory from being held hostage by the details of PES, while ready to take advantage of them when they are available. I will present some initial results of the theory including universal models for exoergic neutral-neutral and charge-neutral reactions, and will explain the origin of such universalities.