Development and deployment of a cavity enhanced UV-LED spectrometer for measurements of atmospheric HONO and NO2 in Hong Kong

Wu, Tao; Zha, Qiaozhi; Chen, Weidong; Xu, Zheng; Wang, Tao; He, Xingdao

doi:10.1016/j.atmosenv.2014.07.016

Cited by 53 publications

(37 citation statements)

References 42 publications

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“…(4). The detection limit for HONO for our IBBCEAS instrument compared with the previous study 22 has been slightly improved. …”

Section: Sensitivity Of Hono Measurementsmentioning

confidence: 81%

“…A value of αRay(λ) 7 × 10 -7 cm -1 at 1 atm and 360 nm was applied in our study. 22 To solve Eq. (4), it is necessary to obtain the effective path length, L′(λ), related to the mirror reflectivity.…”

Section: Retrieval Methodsmentioning

confidence: 99%

“…1. Our instrument is similar to earlier models, [20][21][22] and consists of a light source, with optics for introducing light into a cavity, and a spectrometer with a charge-coupled device (CCD) array detector. A high-power UV LED (M365D1; Thorabs Inc., NJ, USA) was employed as a light source, with an optical power of 360 mW, a center wavelength of 365 nm, and full width at half maximum of 7.5 nm.…”

Section: Incoherent Broadband Cavity-enhanced Absorption Spectrometermentioning

confidence: 99%

“…IBBCEAS has been used in many studies to measure ambient concentrations of trace species. [20][21][22] In particular, for NO2 measurements, comparisons of various techniques with IBBCEAS results have been carried out, validating IBBCEAS measurements. 23 IBBCEAS measures HONO and NO2 simultaneously, in essentially the same sample air, which offers a great advantage to researchers.…”

Section: Introductionmentioning

confidence: 99%

“…A comparison of IBBCEAS and LOPAP measurements was carried out in ambient air. 22 Because LOPAP is an indirect measurement technique and has some potential interferences, it is necessary to validate the accuracy of IBBCEAS for gas-phase HONO and NO2 mixtures by comparing some techniques without wet chemistry using standard gases. In this study, simultaneous measurements of HONO using IBBCEAS and a chemiluminescence NOx analyzer with a molybdenum reducing catalyst (Mo converter) was carried out.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Validation of in situ Measurements of Atmospheric Nitrous Acid Using Incoherent Broadband Cavity-enhanced Absorption Spectroscopy

Nakashima

Sadanaga

2017

ANAL. SCI.

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Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is a useful technique for measuring trace gaseous species in the atmosphere. Recently, IBBCEAS was used to measure concentrations of nitrous acid (HONO) in the troposphere to resolve controversies related to its formation and loss. Here, measurements of HONO and a mixture of HONO and NO2 using IBBCEAS were validated by comparing them with those obtained with a NOx analyzer. Good agreement was found between these methods, given their respective experimental uncertainties. The detection limit of our IBBCEAS instrument was 0.2 ppbv, with a signal-to-noise ratio of 1, and a 5-min integration time.

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“…(4). The detection limit for HONO for our IBBCEAS instrument compared with the previous study 22 has been slightly improved. …”

Section: Sensitivity Of Hono Measurementsmentioning

confidence: 81%

Section: Retrieval Methodsmentioning

confidence: 99%

Section: Incoherent Broadband Cavity-enhanced Absorption Spectrometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Validation of in situ Measurements of Atmospheric Nitrous Acid Using Incoherent Broadband Cavity-enhanced Absorption Spectroscopy

Nakashima

Sadanaga

2017

ANAL. SCI.

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Photonic Sensing of Reactive Atmospheric Species

Chen

et al. 2017

Encyclopedia of Analytical Chemistry

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Chemically reactive short‐lived atmospheric species play a crucial role in tropospheric processes that affect regional air quality and global climate change. Contrary to long‐lived species (such as greenhouse gases), fast, interference‐free, accurate, and precise in situ monitoring of such strongly reactive species represents a real challenge owing to their very high reactivity resulting in short lifetimes (∼1–100 s) and ultralow concentrations (∼pptv). In this article, we give an overview of the recent progress in the development of absorption spectroscopy‐based photonic instruments involving modern photonic light sources (quantum cascade laser, distributed feedback diode laser, and light‐emitting diode) combined with high‐sensitivity spectroscopic measurement techniques such as incoherent broadband cavity‐enhanced absorption spectroscopy, Faraday rotation spectroscopy, wavelength‐modulation‐enhanced off‐axis integrated cavity output spectroscopy, tuning fork‐ or microphone‐based photoacoustic spectroscopy, and open‐path multipass absorption spectroscopy. Illustrative examples of monitoring some key atmospheric reactive species (such as HONO, OH, NO 3 , N 2 O 5 , and NO 2 ) will be presented for applications in intensive field campaigns, instrumented atmospheric simulation chamber, or laboratory investigation.

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Ultraviolet Photodissociation Induced by Light‐Emitting Diodes in a Planar Ion Trap

et al. 2016

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The first application of light-emitting diodes (LEDs) for ultraviolet photodissociation (UVPD) mass spectrometry is reported. LEDs provide ac ompact, low cost light source and have been incorporated directly into the trapping cell of an Orbitrap mass spectrometer.M S/MS efficiencies of over 50 % were obtained using an extended irradiation period, and UVPD was optimizedb ym odulating the ion trapping parameters to maximizet he overlap between the ion cloud and the irradiation volume.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: http://dx.

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Development and deployment of a cavity enhanced UV-LED spectrometer for measurements of atmospheric HONO and NO2 in Hong Kong

Cited by 53 publications

References 42 publications

Validation of in situ Measurements of Atmospheric Nitrous Acid Using Incoherent Broadband Cavity-enhanced Absorption Spectroscopy

Validation of in situ Measurements of Atmospheric Nitrous Acid Using Incoherent Broadband Cavity-enhanced Absorption Spectroscopy

Photonic Sensing of Reactive Atmospheric Species

Ultraviolet Photodissociation Induced by Light‐Emitting Diodes in a Planar Ion Trap

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