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Wang L, Wang Y, Yang G, Li Y, Liu Y, Lu Y, Yao L, Wang L. Measurements of Atmospheric HO 2 Radicals Using Br-CIMS with Elimination of Potential Interferences from Ambient Peroxynitric Acid. Anal Chem 2024. [PMID: 39151028 DOI: 10.1021/acs.analchem.4c01184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2024]
Abstract
As a promising direct measurement method of atmospheric hydroperoxyl radicals (HO2), bromide chemical ionization mass spectrometry (Br-CIMS) has been first demonstrated by Sanchez et al. (Atmos. Meas. Tech. 2016, 9, 3851-3861). However, field application of this method is currently still sparse, and there is still a gap between measured HO2 concentrations and calculated ones derived from the atmospheric equilibrium between HO2 and peroxynitric acid (HO2NO2). In this work, we constructed an improved Br-CIMS with optimizations of custom-built front-end devices, chamber pressures, and instrumental voltages to achieve a 3σ detection limit of 0.5 ppt at an integration time of 60 s and a sensitivity of 1-3 cps ppt-1 under a total reagent ion signal of 0.2 MHz for HO2 detection. HO2NO2, a product from atmospheric reactions between HO2 and NO2, can also be detected by Br-CIMS, whose interference on the HO2 measurement was found but nearly eliminated by regulating key CIMS voltages to minimize the decomposition of (BrHO2NO2)- ions in the MS. In addition, a 2 week field campaign was carried out in urban Shanghai, demonstrating that the interference of HO2 from ambient HO2NO2 was less than 10% of the true HO2 signal under our optimized CIMS voltage setting. Our study suggests that Br-CIMS is a reliable technique for atmospheric HO2 measurements.
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Affiliation(s)
- Lihong Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Yuwei Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Gan Yang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Yueyang Li
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Yiliang Liu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Yiqun Lu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
| | - Lei Yao
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
- National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Shanghai 200438, China
| | - Lin Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Jiangwan Campus, Fudan University, Shanghai 200438, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
- National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Shanghai 200438, China
- Collaborative Innovation Center of Climate Change, Nanjing 210023, China
- IRDR International Center of Excellence on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health, Fudan University, Shanghai 200438, China
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Zhong H, Meng Q, Mei B, Thawko A, Yan C, Liu N, Mao X, Wang Z, Wysocki G, Truhlar DG, Ju Y. Kinetics and Mechanism of the Singlet Oxygen Atom Reaction with Dimethyl Ether. J Phys Chem Lett 2024; 15:6158-6165. [PMID: 38836585 DOI: 10.1021/acs.jpclett.4c00907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
We combine in situ laser spectroscopy, quantum chemistry, and kinetic calculations to study the reaction of a singlet oxygen atom with dimethyl ether. Infrared laser absorption spectroscopy and Faraday rotation spectroscopy are used for the detection and quantification of the reaction products OH, H2O, HO2, and CH2O on submillisecond time scales. Fitting temporal profiles of products with simulations using an in-house reaction mechanism allows product branching to be quantified at 30, 60, and 150 Torr. The experimentally determined product branching agrees well with master equation calculations based on electronic structure data and transition state theory. The calculations demonstrate that the dimethyl peroxide (CH3OOCH3) generated via O-insertion into the C-O bond undergoes subsequent dissociation to CH3O + CH3O through energetically favored reactions without an intrinsic barrier. This O-insertion mechanism can be important for understanding the fate of biofuels leaking into the atmosphere and for plasma-based biofuel processing technologies.
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Affiliation(s)
- Hongtao Zhong
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Qinghui Meng
- Department of Chemistry and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Bowen Mei
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Andy Thawko
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Chao Yan
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Ning Liu
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Xingqian Mao
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Ziyu Wang
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Gerard Wysocki
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08540, United States
| | - Donald G Truhlar
- Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Yiguang Ju
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08540, United States
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, United States
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Wang C, Zhao W, Fang B, Yang N, Cheng F, Hu X, Chen Y, Zhang W, Fittschen C, Chen W. Portable cavity ring-down spectrometer for an HO 2 radical measurement: instrument's performance and potential improvement using a narrow linewidth laser. OPTICS EXPRESS 2022; 30:37446-37456. [PMID: 36258333 DOI: 10.1364/oe.470296] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/13/2022] [Indexed: 06/16/2023]
Abstract
We report the development of a portable cavity ring-down spectrometer (CRDS) for direct and absolute measurement of HO2 radical concentration using a distributed feedback (DFB) diode laser operating at 1506 nm. The spectrometer has a compact design with all optics in a 1000 × 400 × 140 mm3 box. At a pressure of 100 mbar and a ring-down time (τ0) of 136 µs, the detection limit of the CRDS spectrometer was ∼ 7.3 × 107 molecule/cm3 (1σ, 10s). The corresponding detection sensitivity was 1.5 × 10-11 cm-1, which was close to the state-of-the-art performance. By replacing the DFB diode laser with a narrow linewidth erbium-doped fiber (EDF) laser, the amplitude fluctuation caused by the laser phase noise was reduced and the cavity mode injection efficiency was improved. The sensitivity was improved to 3.9 × 10-12 cm-1 with a short data-acquisition time of 0.2 s. Compared with the DFB laser, the improvement was nearly an order of magnitude. The use of the narrow linewidth laser is attractive. The instrument can achieve very high sensitivity without the need for a complex locking technique, ensuring simple and ease of use in future field applications.
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Maity A, Maithani S, Pradhan M. Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications. Anal Chem 2020; 93:388-416. [DOI: 10.1021/acs.analchem.0c04329] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Abhijit Maity
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
| | - Sanchi Maithani
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
| | - Manik Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
- Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India
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Luo PL, Horng EC. Simultaneous determination of transient free radicals and reaction kinetics by high-resolution time-resolved dual-comb spectroscopy. Commun Chem 2020; 3:95. [PMID: 36703338 PMCID: PMC9814257 DOI: 10.1038/s42004-020-00353-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/10/2020] [Indexed: 01/29/2023] Open
Abstract
Quantitative determination of multiple transient species is critical in investigating reaction mechanisms and kinetics under various conditions. Dual-comb spectroscopy, a comb-laser-based multi-heterodyne interferometric technique that enables simultaneous achievement of broadband, high-resolution, and rapid spectral acquisition, opens a new era of time-resolved spectroscopic measurements. Employing an electro-optic dual-comb spectrometer with central wavelength near 3 µm coupled with a Herriott multipass absorption cell, here we demonstrate simultaneous determination of multiple species, including methanol, formaldehyde, HO2 and OH radicals, and investigate the reaction kinetics. In addition to quantitative spectral analyses of high-resolution and tens of microsecond time-resolved spectra recorded upon flash photolysis of precursor mixtures, we determine a rate coefficient of the HO2 + NO reaction by directly detecting both HO2 and OH radicals. Our approach exhibits potential in discovering reactive intermediates and exploring complex reaction mechanisms, especially those of radical-radical reactions.
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Affiliation(s)
- Pei-Ling Luo
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan.
| | - Er-Chien Horng
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
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Spiliotis A, Xygkis M, Klironomou E, Kardamaki E, Boulogiannis G, Katsoprinakis G, Sofikitis D, Rakitzis T. Optical activity of lysozyme in solution at 532 nm via signal-reversing cavity ring-down polarimetry. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Visschers JC, Tretiak O, Budker D, Bougas L. Continuous-wave cavity ring-down polarimetry. J Chem Phys 2020; 152:164202. [DOI: 10.1063/5.0004476] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Jim C. Visschers
- Institut für Physik, Johannes Gutenberg Universität-Mainz, 55128 Mainz, Germany
| | - Oleg Tretiak
- Institut für Physik, Johannes Gutenberg Universität-Mainz, 55128 Mainz, Germany
| | - Dmitry Budker
- Institut für Physik, Johannes Gutenberg Universität-Mainz, 55128 Mainz, Germany
- Helmholtz-Institut Mainz, Mainz 55128, Germany
- Department of Physics, University of California, Berkeley, California 94720-300, USA
| | - Lykourgos Bougas
- Institut für Physik, Johannes Gutenberg Universität-Mainz, 55128 Mainz, Germany
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