Measurements of nitrogen-broadening coefficients in the ν3 band of the hydroperoxyl radical using a continuous wave quantum cascade laser

Miyano, Shun; Tonokura, Kenichi

doi:10.1016/j.jms.2010.10.010

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…A supersonic free-jet spectrum of the v 4 band of CF 3 Cl from 1215.8 to 1220.6 cm −1 was measured using a liquid nitrogen cooled QCL and a 2.8 m White cell. 105 In addition, Tonokura et al 106,107 demonstrated the spectral line parameters (line strength and N 2 -broadening coefficients) measurements of the v 3 band of hydroperoxyl (HO 2 ) radical in the mid-infrared region at around 1065 cm −1 using CW-DFB-QCL spectroscopy. Two of the strongest formaldehyde (H 2 CO) v 6 band transitions around 8 μm are assigned as (1, 1, 1) ← (2, 0, 2) and (10, 1, 9) ← (9, 2, 8) centered at 1252.11231 and 1253.14392 cm −1 by Wang and Sharples.…”

Section: Selected Applications Of Quantum Cascade Laser-based Spectromentioning

confidence: 99%

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Zhang

Тиан

et al. 2014

Appl Spectrosc

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Infrared laser absorption spectroscopy (LAS) is a promising modern technique for sensing trace gases with high sensitivity, selectivity, and high time resolution. Mid-infrared quantum cascade lasers, operating in a pulsed or continuous wave mode, have potential as spectroscopic sources because of their narrow linewidths, single mode operation, tunability, high output power, reliability, low power consumption, and compactness. This paper reviews some important developments in modern laser absorption spectroscopy based on the use of quantum cascade laser (QCL) sources. Among the various laser spectroscopic methods, this review is focused on selected absorption spectroscopy applications of QCLs, with particular emphasis on molecular spectroscopy, industrial process control, combustion diagnostics, and medical breath analysis.

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Section: Selected Applications Of Quantum Cascade Laser-based Spectromentioning

confidence: 99%

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Zhang

Тиан

et al. 2014

Appl Spectrosc

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“…HNO 3 : lines broadened by N 2 (T) (Laraia et al 2009). HO 2 : lines broadened by N 2 (E) (Miyano & Tonokura 2011). H 2 O 2 : lines broadened by N 2 , O 2 and air (E) (Sato et al 2010).…”

Section: Broadening and Shift Of Molecular Linesmentioning

confidence: 99%

Division Xii / Commission 14 / Working Group Collision Processes

Peach¹,

Dimitrijević²

2011

Proc. IAU

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Research in atomic and molecular collision processes and spectral line broadening has been very active since our last report, Peach, Dimitrijević & Stancil 2009. Given the large volume of the published literature and the limited space available, we have attempted to identify work most relevant to astrophysics. Since our report can not be comprehensive, additional publications can be found in the databases at the web addresses listed in the final section. Elastic and inelastic collisions among electrons, atoms, ions, and molecules are included and charge transfer can be very important in collisions between heavy particles.

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“…CH2OO is a reactive species produced in the atmosphere during the ozonolysis of unsaturated volatile organic compounds (VOCs) that has been of recent interest as a result of developments in photolytic sources (Welz et al, 2012) for detailed laboratory studies which have revealed a more significant role in atmospheric chemistry than previously expected (Chhantyal-Pun et al, 2020;Percival et al, 2013). Quasi-continuous QCLs, pulsed QCLs in which the pulse period is relatively long compared to the lifetime of the species under investigation, have also been used to investigate the spectra and kinetics of CH2OO (Chang et al, 2018a), and cw QCLs have been used to investigate the kinetics of CH2OO (Luo et al, 2018b;Luo et al, 2019;Li et al, 2019;Li et al, 2020) and other larger Criegee intermediates (Luo et al, 2018b), as well as the spectroscopy and kinetics of the atmospherically important peroxy radicals HO2 (Miyano and Tonokura, 2011;Sakamoto and Tonokura, 2012) and CH3O2 (Chattopadhyay et al, 2018). While mid-IR QCLs have been employed to study the kinetics and spectroscopy of reactive species relevant to atmospheric chemistry, there are still few examples of the use of QCL-based techniques to identify reaction products and to determine product yields.…”

Section: Introductionmentioning

confidence: 99%

Identification, monitoring, and reaction kinetics of reactive trace species using time-resolved mid-infrared quantum cascade laser absorption spectroscopy: Development, characterisation, and initial results for the Criegee intermediate CH<sub>2</sub>OO

Mir

Jamieson

Greenall

et al. 2022

Preprint

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Abstract. The chemistry and reaction kinetics of reactive species dominate changes to the composition of complex chemical systems, including Earth’s atmosphere. Laboratory experiments to identify reactive species and their reaction products, and to monitor their reaction kinetics and product yields, are key to our understanding of complex systems. In this work we describe the development and characterisation of an experiment using laser flash photolysis coupled with time-resolved mid-infrared (mid-IR) quantum cascade laser (QCL) absorption spectroscopy, with initial results reported for measurements of the infrared spectrum, kinetics, and product yields for the reaction of the CH2OO Criegee intermediate with SO2. The instrument presented has high spectral (< 0.004 cm−1) and temporal (< 5 µs) resolution, and is able to monitor kinetics with a dynamic range to at least 20,000 s−1. Results obtained at 298 K and pressures between 20 and 100 Torr gave a rate coefficient for the reaction of CH2OO with SO2 of (3.83 ± 0.63) × 10−11 cm3 s−1, which compares well to the current IUPAC recommendation of × 10−11 cm3 s−1. A limit of detection of 4.0 × 10−5, in absorbance terms, can be achieved, which equates to a limit of detection of ~2 × 1011 cm−3 for CH2OO, monitored at 1285.7 cm−1, based on the detection pathlength of (218 ± 20) cm. Initial results, directly monitoring SO3 at 1388.7 cm−1, demonstrate that SO3 is the reaction product for CH2OO + SO2. The use of mid-IR QCL absorption spectroscopy offers significant advantages over alternative techniques commonly used to determine reaction kinetics, such as laser-induced fluorescence (LIF) or ultraviolet absorption spectroscopy owing to the greater number of species to which IR measurements can be applied. There are also significant advantages over alternative IR techniques, such as step-scan FT-IR, owing to the coherence and increased intensity and spectral resolution of the QCL source, and in terms of cost. The instrument described in this work has potential applications in atmospheric chemistry, astrochemistry, combustion chemistry, and in the monitoring of trace species in industrial processes and medical diagnostics.

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Measurements of nitrogen-broadening coefficients in the ν3 band of the hydroperoxyl radical using a continuous wave quantum cascade laser

Cited by 14 publications

References 34 publications

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Division Xii / Commission 14 / Working Group Collision Processes

Identification, monitoring, and reaction kinetics of reactive trace species using time-resolved mid-infrared quantum cascade laser absorption spectroscopy: Development, characterisation, and initial results for the Criegee intermediate CH<sub>2</sub>OO

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Measurements of nitrogen-broadening coefficients in the ν3 band of the hydroperoxyl radical using a continuous wave quantum cascade laser

Cited by 14 publications

References 34 publications

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Applications of Absorption Spectroscopy Using Quantum Cascade Lasers

Division Xii / Commission 14 / Working Group Collision Processes

Identification, monitoring, and reaction kinetics of reactive trace species using time-resolved mid-infrared quantum cascade laser absorption spectroscopy: Development, characterisation, and initial results for the Criegee intermediate CH&lt;sub&gt;2&lt;/sub&gt;OO

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Identification, monitoring, and reaction kinetics of reactive trace species using time-resolved mid-infrared quantum cascade laser absorption spectroscopy: Development, characterisation, and initial results for the Criegee intermediate CH<sub>2</sub>OO