US-Austria Cooperative Research: Comparison of Photons-, Electron-, and Ion-Induced Desorption from Surfaces

该奖项支持范德比尔特大学的Norman Tolk教授和Royal Albridge，Jr.继续与奥地利维也纳工业大学普通物理研究所的Wolfgang Husinsky教授和Gerhard Betz教授在实验表面物理方面进行富有成效的合作。他们正在对负责粒子最终状态的微观电子机制进行合作研究，粒子是由于光子、电子和离子的轰击而从表面发射出来的。他们的目标是对定向光束的能量如何被吸收、电子定域并最终在不同表面转化为发射粒子的内能和动能的方式有基本的了解。维也纳小组在使用光学技术，特别是激光诱导荧光检测和表征离子-表面碰撞产生的溅射粒子方面处于世界领先地位。范德比尔特小组一直在研究与电子和紫外光光子轰击固体表面有关的严格的电子脱附过程。通过合作，他们证明了有可能使用激光诱导荧光技术来识别特定的激子和缺陷通道，入射光束能量在打破纯晶体材料表面和近表面块体中的键时流经这些通道。他们还开始研究薄吸附层对电子跃迁引起的脱附的影响。

This award supports Professors Norman Tolk and Royal Albridge, Jr., of Vanderbilt University to continue their productive collaboration in experimental surface physics with Professors Wolfgang Husinsky and Gerhard Betz of the Institute of General Physics of the Technical University of Vienna, Austria. They are carrying out cooperative investigations of the microscopic electronic mechanisms responsible for the final states of particles which are emitted from surfaces due to bombardment of photons, electrons and ions. Their goal is to gain basic understanding of the way in which energy from directed beams may be absorbed, electronically localized and ultimately transformed at various surfaces into internal and kinetic energies of the emitted particle. The Viennese group is a world leader in the detection and characteri- zation of sputtered particles produced by ion-surface collisions using optical techniques, in particular, laser-induced fluorescence. The Vanderbilt group has been studying the strictly electronic desorption processes associated with electron and UV photon bombardment of solid surfaces. Through collaboration, they have demonstrated that it is possible using laser-induced fluorescence techniques to identify specific excitonic and defect channels through which incident beam energy flows as it breaks bonds in the surface and near-surface bulk in pure crystalline materials. They have also begun studies of the effect of thin adsorbed layers on desorption induced by electronic transitions.