Scaling in Molecular Electronic Spectroscopy

Robert W.支持马萨诸塞州理工学院领域 通过实验物理化学计划，进一步发展和 利用分子量子亏损理论（MQDT）， 分子电子学中标度（n ~*，l和ml）研究 谱 具体来说，他将使用斯塔克开关光谱， 研究核非穿透分子里德伯态或双色 共振增强多光子电离研究核穿透 碱土金属一卤化物的里德伯系。最初，他将专注于 相对简单的系统，如碱土金属一卤化物，则 更复杂的系统，包括更大的多原子分子。 他的总体目标是开发，发现和测试非传统的 最终可能描述电子结构的模型 整个分子家族的动力学：所有的性质，所有的状态， 所有的动态过程。 关于这些实验的实际意义的一些评论是 有正当理由 为什么我们要关心 阳离子？ 所有的+1阳离子都有相同的电荷，所以这个主要的方面 阳离子与外界的相互作用是独立的 分子。 另一方面，离子特异性长程相互作用， 从较高的多极子（及其正常坐标）导出 位移导数）。 这些多极子和导数控制着 共振长程离子分子，离子电子， 以及可能的离子-表面能量和角动量交换。 的 从岩心非穿透系统研究中获得的信息 里德伯态将对各种各样的 发生在等离子体中的过程。

Robert W. Field of The Massachusetts Institute of Technology is supported by the Experimental Physical Chemistry Program to further develop and exploit molecular quantum defect theory (MQDT) in an ongoing effort to investigate scaling (with n*, l and ml) in molecular electronic spectroscopy. Specifically, he will use Stark switching spectroscopy to study core non-penetrating molecular Rydberg states or two-color resonance-enhanced multiphoton ionization to study the core-penetrating Rydberg series of alkaline earth monohalides. Initially, he will focus on relatively simple systems such as the alkaline earth monohalides, then gravitate to more complex systems including larger polyatomic molecules. His overall objective is to exploit, uncover, and test unconventional models which might eventually describe the electronic structure and dynamics of entire families of molecules: all properties, all states, all dynamical processes. A few comments about the practical significance of these experiments are warranted. Why should we care about the electric multipole moments of cations? All +1 cations have the same monopole, so this dominant aspect of the interaction of the cation with the outside world is independent of the molecule. Ion-specific long-range interactions, on the other hand, derive from the higher multipoles (and their normal coordinate displacement derivatives). These multipoles and derivatives control the mechanisms and rates of resonant long-range ion-molecule, ion-electron, and possibly ion-surface energy and angular momentum exchange. The information obtainable from systematic studies of core-nonpenetrating Rydberg states would yield valuable insights into a wide variety of processes occurring in plasmas.