Articles | Volume 12, issue 4
Atmos. Meas. Tech., 12, 2371–2385, 2019
https://doi.org/10.5194/amt-12-2371-2019
Atmos. Meas. Tech., 12, 2371–2385, 2019
https://doi.org/10.5194/amt-12-2371-2019

Research article 15 Apr 2019

Research article | 15 Apr 2019

The impact of bath gas composition on the calibration of photoacoustic spectrometers with ozone at discrete visible wavelengths spanning the Chappuis band

Michael I. Cotterell et al.

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Latest update: 15 May 2021
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Short summary
Photoacoustic spectroscopy provides measurements of absorption coefficient for aerosol and gas samples but requires careful calibration, and researchers often use concentrations of ozone. Recent work has shown that the bath gas composition impacts the accuracy of this calibration at visible wavelengths. We explore further the role of bath gas, demonstrating that the calibration accuracy is optimal for a bath gas composed of 20 % oxygen and 80 % nitrogen at wavelengths of 405, 514 and 658 nm.