Articles | Volume 9, issue 1
https://doi.org/10.5194/amt-9-41-2016
https://doi.org/10.5194/amt-9-41-2016
Research article
 | 
15 Jan 2016
Research article |  | 15 Jan 2016

Broadband cavity-enhanced absorption spectroscopy in the ultraviolet spectral region for measurements of nitrogen dioxide and formaldehyde

R. A. Washenfelder, A. R. Attwood, J. M. Flores, K. J. Zarzana, Y. Rudich, and S. S. Brown

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Formaldehyde is the most abundant aldehyde in the atmosphere and plays an important role in photochemistry. Broadband cavity-enhanced absorption spectroscopy uses a high finesse cavity to obtain effective path lengths of kilometers. We use a diode-pumped plasma lamp and custom cavity mirrors to extend this technique further into the ultraviolet spectral region, and we achieve detection limits of hundreds of parts per trillion in 1 min for formaldehyde and nitrogen dioxide.