US-Sweden Cooperative Research: Ion Beam Desorption of Molecular Solids

该奖项将支持固态物理领域的合作研究，包括弗吉尼亚大学的R.E.Johnson博士和J.W.Drill博士，以及瑞典乌普萨拉大学Tandem加速器实验室的B.U.Sundquist博士。该项目的目标是描述各种有机材料和分子绝缘体的电诱导解吸和改性的常见机制。美国调查人员一直在实施一项理论计划，对离子穿透绝缘材料时引发的电子和化学过程进行建模，以及对此类材料进行电子和Kev离子修饰的实验计划。一项主要的努力是研究低温分子凝聚气体。桑德奎斯特博士在乌普萨拉的研究小组使用串列加速器和最近获得的激光，一直在研究MeV离子和激光诱导从凝聚分子样本中解吸大生物分子，作为一种独特的质量测定手段。他们还一直在研究用串联加速器对某些电子绝缘体进行改性。在接下来的几年里，他们将有能力使用在乌普萨拉建造的新加速器来照射非常高能量的粒子。美国和瑞典的努力主要集中在描述主体中发生的主要能量喷射过程；然而，他们已经开始描述发生在分子固体中的常见能量转移过程。在拟议的合作中，两个小组将研究有机固体；两个小组进行的实验将进行协调，以揭示物理和化学机制的共同方面。该项目将受益于Uppsala小组最近增加的研究中性生物分子喷射和激光解吸的能力，以及弗吉尼亚小组对化学相似样品进行补充测量的能力。这项研究的结果将在许多科学领域引起人们的兴趣，如生物物理学、天体物理学、电子学和药学。

This award will support cooperative research in solid state physics, involving Drs. R.E. Johnson and J.W. Boring, University of Virginia and Dr. B.U. Sundquist, Tandem Accelerator Laboratory, University of Uppsala, Sweden. The objective of the project is to describe the common mechanisms for electrical-induced desorption and modification of a variety of organic materials and molecular insulators. The US investigators have been carrying out a theoretical program on modeling the electronic and chemical processes which are initiated when an ion penetrates insulating materials, as well as an experimental program for electron and keV ion modification of such materials. A primary effort has been the study of low- temperature, molecular condensed gases. Dr. Sundquist's research group at Uppsala, using the tandem accelerator and recently acquired lasers, has been studying MeV ion and laser-induced desorption of large biological molecules from samples of condensed molecules as a unique means of mass determination. They have also been studying modification of certain electronic insulators with the tandem accelerator. In the next few years they will have the ability to irradiate with very high energy particles using the new accelerator which was built at Uppsala. The US and Swedish efforts have concentrated on describing the principal energy ejection processes which occur in the bulk; however, they have begun to describe the common energy transfer processes occuring in molecular solids. In the proposed collaboration the two groups will study organic solids; the experiments performed by the two groups will be coordinated in order to expose the common aspects of the physical and chemical mechanisms. The project will benefit from the recently-added capabilities of the Uppsala group to study neutral biomolecule ejection and laser desorption and of the ability of Virginia group to make complementary measurements on chemically similar samples. Results of this research will be of interest in a number of scientific areas, such as biophysics, astrophysics, electronics and pharmaceuticals.