Electron-Molecule Collisions in Different Environments

低能电子与分子的相互作用过程在气体、等离子体、液体和凝聚态环境中起着重要的作用。最近对它们在高层大气物理和生物环境中的作用的研究刺激了人们对这些过程的更大兴趣。在激光场中放置分子为控制和操纵电子-分子碰撞过程创造了机会。不同环境中的电子-分子相互作用之所以引起人们的兴趣，不仅是因为它们在应用中的重要性，还因为它们展示了有趣的物理机制。本项目建议研究气相、表面、凝聚态和强激光存在下的电子-分子碰撞过程。方案的第一部分讨论了解离电子与多原子分子的附着，考虑了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。在这些系统中，我们将进一步研究由束缚偶极支撑态引起的振动Feshbach共振的作用。第二类将被研究的过程是解离电子附着在超吸附分子和嵌入在主体介质中的分子上。考虑电子与环境相互作用的这些过程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。主要的焦点是高于阈值的电离，特别是它的共振增强，这是最近在原子电离中发现的。

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.