Articles | Volume 13, issue 8
Atmos. Meas. Tech., 13, 4159–4167, 2020
https://doi.org/10.5194/amt-13-4159-2020
Atmos. Meas. Tech., 13, 4159–4167, 2020
https://doi.org/10.5194/amt-13-4159-2020

Research article 05 Aug 2020

Research article | 05 Aug 2020

A compact, high-purity source of HONO validated by Fourier transform infrared and thermal-dissociation cavity ring-down spectroscopy

Nicholas J. Gingerysty and Hans D. Osthoff

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Latest update: 16 May 2021
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Short summary
The generation of clean calibration gases is critical for accurate ambient air measurements. Here, we describe a source of HONO vapour dynamically generated from reaction of HCl and NaNO2. The output was characterized by Fourier transform infrared (FTIR) and thermal-dissociation cavity ring-down spectroscopy (TD-CRDS) and was stable, tuneable, and > 95 % pure. We show how generation of unwanted side products (NO, NO2, and ClNO) can be avoided.