Fluorescence Methods

and, Ezra C Wood; Cohen, R. C.

doi:10.1002/9780470988510.ch4

Cited by 3 publications

(1 citation statement)

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“…Although undoubtedly important, HO 2 provides a range of challenges when considering appropriate detection techniques as atmospheric daytime levels of HO 2 are very small [∼2.5 × 10 8 molecules cm –3 ≡ 10 parts per trillion (ppt)] and so require very sensitive detection techniques. Currently, HO 2 is measured by the indirect techniques FAGE (fluorescence assay by gas expansion), which is essentially laser-induced fluorescence at low pressure, − and PERCA (peroxy radical chain amplification), whereby HO 2 and RO 2 catalyze the oxidation of NO and CO into CO 2 and NO 2 , which can then be measured. − Although FAGE specifically measures HO 2 (indirectly through its conversion into OH), it suffers from interference from RO 2 radicals . PERCA traditionally measures the sum of all RO 2 species, although we note that a very recent work showed the possibility of selective measurement of atmospheric peroxy radical concentrations of HO 2 and RO 2 using a denuding method based on PERCA .…”

Section: Introductionmentioning

confidence: 99%

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range

et al. 2012

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Accurate measurements of the absolute concentrations of radical species present in the atmosphere are invaluable for better understanding atmospheric processes and their impact on Earth systems. One of the most interesting species is HO(2), the hydroperoxyl radical, whose atmospheric daytime levels are on the order of 10 ppt and whose observation therefore requires very sensitive detection techniques. In this work, we demonstrate the first steps toward the application of external-cavity diode-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) to the detection of the HO(2) radical in the near-infrared range. Measurements of stable species and of HO(2) were made in a laboratory setting, and the possibilities of extending the sensitivity of the technique to atmospheric conditions are discussed.

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Section: Introductionmentioning

confidence: 99%

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range

et al. 2012

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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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An Introduction to Measurements of Atmospheric Composition

Carlo

2010

Integrated Ground-Based Observing Systems

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Fluorescence Methods

Cited by 3 publications

References 136 publications

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range

Photonic Sensing of Reactive Atmospheric Species

An Introduction to Measurements of Atmospheric Composition

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Fluorescence Methods

Cited by 3 publications

References 136 publications

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO2 in the Near-Infrared Range

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO2 in the Near-Infrared Range

Photonic Sensing of Reactive Atmospheric Species

An Introduction to Measurements of Atmospheric Composition

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Product

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Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range

Noise-Immune Cavity-Enhanced Optical Heterodyne Detection of HO₂ in the Near-Infrared Range