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Fourier Transform Infrared Spectroscopy of Nitric Oxide During Exposure to Vacuum Ultraviolet Radiation

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The FT-IR spectrum of chemically pure (C.P.) NO was obtained while the gas was being irradiated by radiation at 121.5 nm. A novel cell design allows the ultraviolet radiation and the infrared probe beam to be colinear. The exposure time of the gas to the UV radiation ranged from 0 to 100 minutes. Spectra were collected at evenly spaced time intervals during irradiation by the UV radiation. The composition of the gas changed as a function of irradiation time. Experimental results were compared with the calculated change in the composition of the gas by solving a set of simultaneous differential equations based on a kinetic model, giving good agreement. It is shown that the cell may also be used as an actinometer, and may be used as a check on the applicability of some rate equations to reacting systems.

Keywords: Infrared spectroscopy; Ion chemistry; Photoionization

Document Type: Research Article


Affiliations: Ballistics Research Laboratory, SLCBR-IB-I, Aberdeen Proving Ground, Maryland 21005

Publication date: June 1, 1991

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