Adiabatic and Nonadiabatic Energy Transfer in Cold and Ultracold Collisions

冷和超冷碰撞中的绝热和非绝热能量转移

• 批准号: 0701445
• 负责人: Gregory Parker
• 金额: --
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0701445&HistoricalAwards=false
• 关键词: Adiabatic; Nonadiabatic; Energy; Transfer; Cold

The proposal tackles some very difficult yet contemporary problems in collision physics.Three-body recombination research will be extended to the heavier alkalis (Na, K,Rb and Cs). A detailed direct comparison of the scattering results when one includes orexcludes nonadiabatic coupling terms and conical intersections will provide new insightsfor interpreting observed phenomena. Study of coherently controlled bimolecularreactions will be extended to include nonadiabatic effects and laser fields. Energydependent cross sections will be calculated over a large energy range from ultracoldenergies to thermal energies. Threshold behavior and quantum resonances will bemapped out. The inclusion of electromagnetic interactions will provide cross sections asa function of laser intensity. The range of laser intensities will be from very weakintensities to intensities of more than 1012 watts/cm3. Photon-system interactions willprovide a rich enviroment for studying chemical reactions especially at ultracold andcold temperatures. Time-dependent methods will be developed to watch the flow ofenergy among different adiabatic states and regions of configuration space.

该方案解决了碰撞物理学中一些非常困难但又是当代的问题，将三体复合研究扩展到较重的碱金属（Na、K、Rb和Cs）。当一个包括或不包括非绝热耦合项和锥形交叉点时，散射结果的详细直接比较将为解释观察到的现象提供新的见解。相干控制双分子反应的研究将扩展到包括非绝热效应和激光场。能量依赖的截面将在从超冷能到热能的大能量范围内计算。阈值行为和量子共振将被绘制出来。包括电磁相互作用将提供横截面阿萨激光强度的函数。激光强度的范围将从非常弱的强度到超过1012瓦特/厘米3的强度。光子与体系的相互作用将为研究化学反应提供一个丰富的环境，特别是在超冷和低温下.将发展与时间相关的方法来观察不同绝热状态和组态空间区域之间的能量流动。