The United States of America

Robert J Wild

William P Dubé

Steven S Brown

A sensitive, compact detector measures total reactive nitrogen (NO), as well as NO, NO, and O. In all channels, NOis directly detected by laser diode based cavity ring-down spectroscopy (CRDS) at 405 nm. Ambient Ois converted to NOin excess NO for the Omeasurement channel. Likewise, ambient NO is converted to NOin excess O. Ambient NOis thermally dissociated at 700 C to form NOor NO in a heated quartz inlet. Any NO present in ambient air or formed from thermal dissociation of other reactive nitrogen compounds is converted to NOin excess Oafter the thermal converter. The precision and accuracy of this instrument make it a versatile alternative to standard chemiluminescence-based NOinstruments.

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Boulder, CO, United States of America

Robert J Wild