Articles | Volume 9, issue 1
Atmos. Meas. Tech., 9, 41–52, 2016
https://doi.org/10.5194/amt-9-41-2016
Atmos. Meas. Tech., 9, 41–52, 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 et al.

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Short summary
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.