Electron-Molecule Collisions in Different Environments

不同环境中的电子-分子碰撞

• 批准号: 0652866
• 负责人: Ilya Fabrikant
• 金额: $ 24万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0652866&HistoricalAwards=false
• 关键词: Electron; Molecule; Collisions; Different; Environments

Processes of interaction of low-energy electrons with molecules play important role ingaseous, plasma, liquid and condensed-matter environments. Increased interest tothese processes is stimulated by recent studies of their role in the physics of the upperatmosphere and in biological environments. Placing molecules in laser fields createsopportunities for control and manipulation of electron-molecule collision processes.Electron-molecule interactions in different environments present interest not only due totheir importance in applications, but also because they demonstrate interesting physicsmechanisms.The present project proposes to study electron-molecule collision processes in gasphase, on surfaces, in condensed matter environment and in the presence of stronglaser fields.The first part of the proposal deals with dissociative electron attachment to polyatomicmolecules with the account of interaction between two resonances or interactionbetween several vibrational modes. The role of vibrational Feshbach resonances due toweakly-bound dipole-supported states in these systems will be further investigated. Thesecond class of processes which will be studied is dissociative electron attachment tophysisorbed molecules and molecules embedded in bulk medium. The theory of theseprocesses taking into account the electron interaction with the environment will befurther developed. Finally, the effects of laser field in electron-molecule interaction willbe studied. The main focus will be on the above-threshold ionization and particularly itsresonant enhancement which was recently discovered in atom ionization.

低能电子与分子的相互作用过程在气态、等离子体、液态和凝聚态环境中起着重要的作用。最近对这些过程在上层大气物理和生物环境中的作用的研究，激发了人们对这些过程的兴趣。将分子置于激光场中为控制和操纵电子-分子碰撞过程创造了机会。电子-分子在不同环境中的相互作用不仅因为它们在应用中的重要性，而且因为它们表现出有趣的物理机制而引起人们的兴趣。本项目拟研究在气相、表面、凝聚态环境和强激光场存在下的电子-分子碰撞过程。该建议的第一部分涉及解离电子附着在多原子分子上，并说明两个共振之间或几个振动模式之间的相互作用。在这些系统中，由于弱束缚偶极支持态引起的振动费什巴赫共振的作用将进一步研究。将研究的第二类过程是解离电子附着在吸附分子和嵌入在散装介质中的分子上。考虑到电子与环境相互作用的这些过程的理论将得到进一步发展。最后，研究了激光场对电子-分子相互作用的影响。本文将重点讨论阈值以上电离，特别是最近在原子电离中发现的共振增强现象。