Electron-Molecule Collisions in Different Environments

不同环境中的电子-分子碰撞

基本信息

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

项目摘要

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体、等离子体、液体和凝聚态物质环境中发挥着重要作用。最近对这些过程在高层大气和生物环境中的物理作用的研究激发了人们对这些过程的兴趣增加。将分子放置在激光场中为控制和操纵电子-分子碰撞过程创造了机会。不同环境中的电子-分子相互作用引起人们的兴趣，不仅因为它们在应用中的重要性，而且因为它们展示了有趣的物理机制。本项目建议研究电子-分子碰撞过程。气相、表面、凝聚态环境和强激光场中的分子碰撞过程。该提案的第一部分涉及离解电子附着多原子分子，考虑两个共振之间的相互作用或几个振动模式之间的相互作用。将进一步研究这些系统中弱束缚偶极子支持态导致的振动费什巴赫共振的作用。将研究的第二类过程是离解电子附着到物理吸附分子和嵌入本体介质中的分子。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，研究激光场对电子-分子相互作用的影响。主要关注点是阈值以上电离，特别是最近在原子电离中发现的共振增强。