2021
DOI: 10.5194/amt-14-4033-2021
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Thermal dissociation cavity-enhanced absorption spectrometer for measuring NO<sub>2</sub>, RO<sub>2</sub>NO<sub>2</sub>, and RONO<sub>2</sub> in the atmosphere

Abstract: Abstract. We developed thermal dissociation cavity-enhanced absorption spectroscopy (TD-CEAS) for the in situ measurement of NO2, total peroxy nitrates (PNs, RO2NO2), and total alkyl nitrates (ANs, RONO2) in the atmosphere. PNs and ANs were thermally converted to NO2 at the corresponding pyrolytic temperatures and detected by CEAS at 435–455 nm. The instrument sampled sequentially from three channels at ambient temperature, 453 and 653 K, with a cycle of 3 min, to measure NO2, NO2+ PNs, and NO2+ PNs + ANs. The… Show more

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Cited by 9 publications
(2 citation statements)
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“…We demonstrate that this instrument can be used to make sensitive, real-time measurements of aromatic compounds, specifically the important environmental pollutants BTX, and has potential applications in laboratory research, emissions monitoring, and other combined applications. 22…”
Section: Introductionmentioning
confidence: 99%
“…We demonstrate that this instrument can be used to make sensitive, real-time measurements of aromatic compounds, specifically the important environmental pollutants BTX, and has potential applications in laboratory research, emissions monitoring, and other combined applications. 22…”
Section: Introductionmentioning
confidence: 99%
“…25 The reported methods include cavity ringdown spectroscopy (CRDS), [8][9][10]12,13,15,16,20,21,26 cavity-attenuated phase shift spectroscopy (CAPS), 11,18,27 cavityenhanced spectroscopy (CEAS), 28 optical feedback CEAS, 17,29 mode-locked cavity-enhanced absorption spectroscopy, 30 and broadband CEAS (BBCEAS). 6,14,19,31 CAPS and BBCEAS methods use incoherent light sources [Xe arc lamp or light-emitting diodes (LEDs)] and do not require the light beam to be strictly matched to the spatial mode of the cavity TEM 00 mode, helping to make these instruments simple, robust, and highly suited to field applications. 6 In contrast, laser-based cavity spectroscopy techniques 32 generally require on-axis optical alignment to improve laser injection efficiency into the cavity to achieve better performance.…”
mentioning
confidence: 99%