INFRARED STUDIES OF SEVERAL WEAKLY BOUND COMPLEXES OF $NH_{3}$
Loading...
Date
1985
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
We present the results of infrared spectroscopic studies of several van der Waals complexes of $NH_{3}$. There results were obtained with a molecular beam electric resonance spectrometer. Infrared studies of the complexes $NH_{3}-HCCH, NH_{3}-CO_{2}, NH_{3}-N_{2}O$, and $NH_{3}-HCN$ have been carried out with a line tuneable $CO_{2}$ laser. Only for $NH_{3}-HCN$ were no infrared resonances discovered. Photodissociative transitions are observed in all of the other systems. Band origins for the photodissociative infrared transitions involving the $\mu_{2}$ umbrella motion of $NH_{3}$ were determined for $NH_{3}-HCCH (994.4(9) cm^{-1}), NH_{3}-CO_{2}(987.1(2) cm^{-1})$, and $NH_{3}-N_{2}O(980(2) cm^{-1}) NH_{3}-FCCH, NH_{3}-CO_{2}$ and $NH_{3}-N_{2}O$ were studied in microwave-infrared double resonance experiments in order to eliminate much of the inhomogeneous broadening present in their infrared spectra and to aid in the rotational assignment of the infrared spectra. Linewidths were determined for $NH_{3}-HCCH$ (0.15 CHz) and for $NH_{3}-CO_{2}$ (14(6) CHz). An important result of this study is that the dissociation energies of all the complexes studied, except for $NH_{3}-FCN$, are established to be less than $990 cm^{-1}$, i.e. 2.5 Kcal/mole.""
Description
Author Institution: Department of Chemistry, Harvard University