Multiple Resonance Spectroscopy and Molecular Dynamics

多重共振光谱和分子动力学

• 批准号: 9320110
• 负责人: A. Marjatta Lyyra
• 金额: $ 20.32万
• 依托单位: Temple University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-15 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9320110&HistoricalAwards=false
• 关键词: Multiple; Resonance; Spectroscopy; Molecular; Dynamics

In this project in the Physical Chemistry Program of the Chemistry Division, Prof. Marjatta Lyyra of Temple University will investigate the long range interactions, at separations in excess of 10 Angstroms, between pairs of alkali atoms in order to map out the potential surface near the dissociation limit of alkali diatomic molecules. The sodium molecule is the principal species to be investigated. The molecules are prepared in their long range states by multiple laser excitation. A new multiple resonance technique, stimulated radiative dissociation, will be used to study photodissociation dynamics state selectively as function of molecular rotation and and energy in order to achieve full understanding of long range nonadiabatic mixing of states. The correlation of the initial internuclear distance prepared as dissociation begins with the strengths of the nonadiabatic couplings will also be studied. As part of this work new methods will be developed to enhance the detection of continuous wave multiple resonance signals. This research contributes to the understanding of behavior of atoms at large internuclear separations at the onset of chemical reactions. At large internuclear separations many electronic energy states are often closely spaced, making for couplings betwen them which affect the bond-breaking photodissociation, and bond-forming associative ionization processes. The information gathered in this work will be of assistance in understanding the results of contemporary research on atomic collisions at ultra low temperatures.

在化学分部的物理化学计划中，坦普尔大学的Marjatta Lyyra教授将研究远距离相互作用，分离超过10埃，在成对的碱原子之间，以绘制出附近碱性分子分离的分离极限附近的潜在表面。 钠分子是要研究的主要物种。 这些分子是通过多个激发激发在其远程状态下制备的。 一种新的多重共振技术，即刺激的辐射解离，可用于选择性地研究分子旋转和能量的函数，以便全面了解状态的远程非绝热混合。 解离的初始内部距离的相关性始于非绝热耦合的强度。 作为这项工作的一部分，将开发新方法，以增强连续波多共振信号的检测。 这项研究有助于理解化学反应开始时大核内分离的原子行为。 在较大的核对间分离处，许多电子能状态通常都紧密间隔，这使得它们之间的耦合会影响破坏债券的光解离并建立键合的关联电离过程。 这项工作中收集的信息将有助于理解当代在超低温度下原子碰撞的研究结果。