The Millimeter- and Submillimeter-Wave Spectroscopy of Low Temperature Collisions

在这个项目中，德卢西亚和赫布斯特研究了低能分子碰撞的光谱学和控制它们的相互作用，该项目由化学司的实验物理化学项目支持，由多学科活动办公室提供设备资金。利用毫米和亚毫米光谱技术，结合碰撞冷却和分子离子产生方法，将进行压力展宽、压力位移和状态间旋转能量转移率的实验研究。实验数据将与现代量子化学和散射计算的结果进行比较。感兴趣的系统包括CO-He/H2， H2S-He/H2和HDO-He/H2以及离子系统HCO+-H2， CO+-He和NO+-He。这些结果将有助于深入了解碰撞现象，这些碰撞现象在低能量下最明显地发生，并且高度依赖于分子之间的浅层、远距离吸引势。这个项目的结果与大气化学和天体化学有关，在这些领域，原子、分子和离子之间的相互作用在低温下占主导地位。在这些条件下，这里所研究的分子簇类型很容易形成。

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division with funds for equipment provided by the Office of Multidisciplinary Activities, De Lucia and Herbst investigate the spectroscopy of low energy molecular collisions and of the interactions which govern them. Experimental studies of pressure broadening, pressure shifts, and state-to-state rotational energy transfer rates will be conducted using millimeter and submillimeter spectroscopic techniques coupled with collisional cooling and molecular ion production methods. The experimental data will be compared with results from modern quantum chemical and scattering calculations. Systems of interest include CO-He/H2, H2S-He/H2, and HDO-He/H2 as well as ionic systems HCO+-H2, CO+-He, and NO+-He. These results will help give insight into collision phenomena which occur most visibly at low energies and which are highly dependent on the shallow, long-range attractive potentials between molecules. The results of this program have relevance to atmospheric chemistry and astrochemistry, where interactions involving collisions between atoms molecules and ionic species at low temperatures predominate. Under these conditions the types of molecular cluster species under study here form readily.