Abstract
A detection limit of 200 ppt of NO2 in N2 at atmospheric pressure was obtained with a photoacoustic detector and a high power blue laser diode. This corresponds to a normalized noise (1σ) equivalent absorption coefficient of 2×10-9 cm-1W/Hz0.5. Measurements at different laser modulation frequencies showed no frequency dependence of the photoacoustic signal, indicating a relaxation time τ < 4 μs. Mixing O2 into the NO2 containing gas results in a decrease of the photoacoustic signal. A simple model shows that this effect can be attributed to an increased vibrational-vibrational relaxation of NO2 to O2.
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31.70.Hq; 34.50.Ez; 42.55.Px
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Kalkman, J., van Kesteren, H. Relaxation effects and high sensitivity photoacoustic detection of NO2 with a blue laser diode. Appl. Phys. B 90, 197–200 (2008). https://doi.org/10.1007/s00340-007-2895-0
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DOI: https://doi.org/10.1007/s00340-007-2895-0