Molecular Studies in the Millimeter and Submillimeter Spectral Region

化学部的实验物理化学项目支持De Lucia和Herbst教授在高频微波光谱方面的研究，重点是旋转能量的碰撞转移和分子离子的光谱。新的低温增宽研究正在进行中，以增加对能量传递机制的理解。这些技术也非常适合于研究分子离子的特性和结构。当一束气体分子迅速膨胀时，它会冷却到低至1K的温度，从而有机会研究许多光谱特性，而不受高温下振动效应的影响。利用这种效应的装置被用来研究碰撞分子之间的能量转移和分子离子的结构。

The Experimental Physical Chemistry Program of the Chemistry Division is supporting research by Professors De Lucia and Herbst in high-frequency microwave spectroscopy with emphasis on the collisional tranfer of rotational energy and the spectroscopy of molecular ions. Novel low-temperature line-broadening studies are underway to lead to increased understanding of the energy transfer mechanism. The techniques are also ideally suited to the investigation of the identity and structure of molecular ions. %%% When a beam of gas molecules is rapidly expanded, it cools to temperatures as low as 1K, giving an opportunity to study a number of spectroscopic properties uncomplicated by vibrational effects seen at higher temperatures. An apparatus employing this effect is being used to study the transfer of energy between colliding molecules and the structure of molecular ions.