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Jones IW, Bersson JS, Liu J, Sharma K, Vasilyev OA, Miller TA, Stanton JF. Calculated and Empirical Values of Vibronic Transition Dipole Moments of Reactive Chemical Intermediates for Determination of Concentrations. J Phys Chem A 2023. [PMID: 37216680 DOI: 10.1021/acs.jpca.3c01584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Absorption spectroscopy has long been known as a technique for making molecular concentration measurements and has received enhanced visibility in recent years with the advent of new techniques, like cavity ring-down spectroscopy, that have increased its sensitivity. To apply the method, it is necessary to have a known molecular absorption cross section for the species of interest, which typically is obtained by measurements of a standard sample of known concentration. However, this method fails if the species is highly reactive, and indirect means for attaining the cross section must be employed. The HO2 and alkyl peroxy radicals are examples of reactive species for which absorption cross sections have been reported. This work explores and describes for these peroxy radicals the details of an alternative approach for obtaining these cross sections using quantum chemistry methods for the calculation of the transition dipole moment upon whose square the cross section depends. Likewise, details are given for obtaining the transition moment from the experimentally measured cross sections of individual rovibronic lines in the near-IR Ã-X̃ electronic spectrum of HO2 and the peaks of the rotational contours in the corresponding electronic transitions for the alkyl (methyl, ethyl, and acetyl) peroxy radicals. In the case of the alkyl peroxy radicals, good agreement for the transition moments, ≈20%, is found between the two methods. However, rather surprisingly, the agreement is significantly poorer, ≈40%, for the HO2 radical. Possible reasons for this disagreement are discussed.
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Affiliation(s)
- Ian W Jones
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Jonathan S Bersson
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Jinjun Liu
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
- Department of Physics, University of Louisville, Louisville, Kentucky 40292, United States
| | - Ketan Sharma
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Oleg A Vasilyev
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Terry A Miller
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - John F Stanton
- Departments of Chemistry and Physics, University of Florida, Gainesville, Florida 32611, United States
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Absolute Absorption Cross-Section of the Ã←X˜ Electronic Transition of the Ethyl Peroxy Radical and Rate Constant of Its Cross Reaction with HO2. PHOTONICS 2021. [DOI: 10.3390/photonics8080296] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The absolute absorption cross-section of the ethyl peroxy radical C2H5O2 in the Ã←X˜ electronic transition with the peak wavelength at 7596 cm−1 has been determined by the method of dual wavelengths time resolved continuous wave cavity ring down spectroscopy. C2H5O2 radicals were generated from pulsed 351 nm photolysis of C2H6/Cl2 mixture in presence of 100 Torr O2 at T = 295 K. C2H5O2 radicals were detected on one of the CRDS paths. Two methods have been applied for the determination of the C2H5O2 absorption cross-section: (i) based on Cl-atoms being converted alternatively to either C2H5O2 by adding C2H6 or to hydro peroxy radicals, HO2, by adding CH3OH to the mixture, whereby HO2 was reliably quantified on the second CRDS path in the 2ν1 vibrational overtone at 6638.2 cm−1 (ii) based on the reaction of C2H5O2 with HO2, measured under either excess HO2 or under excess C2H5O2 concentration. Both methods lead to the same peak absorption cross-section for C2H5O2 at 7596 cm−1 of σ = (1.0 ± 0.2) × 10−20 cm2. The rate constant for the cross reaction between of C2H5O2 and HO2 has been measured to be (6.2 ± 1.5) × 10−12 cm3 molecule−1 s−1.
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Paul AC, Sharma K, Reza MA, Telfah H, Miller TA, Liu J. Laser-induced fluorescence and dispersed-fluorescence spectroscopy of the Ã2E−X̃2A1 transition of jet-cooled calcium methoxide (CaOCH3) radicals. J Chem Phys 2019; 151:134303. [DOI: 10.1063/1.5104278] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anam C. Paul
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Ketan Sharma
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA
| | - Md Asmaul Reza
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Hamzeh Telfah
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
| | - Terry A. Miller
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA
| | - Jinjun Liu
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
- Conn Center for Renewable Energy Research, University of Louisville, Louisville, Kentucky 40292, USA
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Launder AM, Turney JM, Agarwal J, Schaefer HF. Ethylperoxy radical: approaching spectroscopic accuracy via coupled-cluster theory. Phys Chem Chem Phys 2017; 19:15715-15723. [DOI: 10.1039/c7cp02795h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly reliable ground and excited state properties of the conformers of ethylperoxy radical are predicted using coupled-cluster theory. This research has implications for future characterization of intermediates in tropospheric and low-temperature combustion processes.
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Affiliation(s)
- Andrew M. Launder
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Jay Agarwal
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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Faragó EP, Viskolcz B, Schoemaecker C, Fittschen C. Absorption Spectrum and Absolute Absorption Cross Sections of CH3O2 Radicals and CH3I Molecules in the Wavelength Range 7473–7497 cm–1. J Phys Chem A 2013; 117:12802-11. [DOI: 10.1021/jp408686s] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eszter P. Faragó
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
- Department
of Chemical Informatics, Faculty of Education, University of Szeged, Boldogasszony sgt. 6, Szeged, Hungary 6725
| | - Bela Viskolcz
- Department
of Chemical Informatics, Faculty of Education, University of Szeged, Boldogasszony sgt. 6, Szeged, Hungary 6725
| | - Coralie Schoemaecker
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- PysicoChimie
des Processus de Combustion et de l’Atmosphère PC2A, CNRS - University Lille 1, Cité Scientifique, Bât. C11, 59655 Villeneuve d’Ascq, France
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Melnik D, Miller TA. Kinetic measurements of the C2H5O2 radical using time-resolved cavity ring-down spectroscopy with a continuous source. J Chem Phys 2013; 139:094201. [DOI: 10.1063/1.4819474] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Melnik D, Thomas PS, Miller TA. Electronic Transition Moment for the 000 Band of the à ← X̃ Transition in the Ethyl Peroxy Radical. J Phys Chem A 2011; 115:13931-41. [PMID: 22003851 DOI: 10.1021/jp207647h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dmitry Melnik
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Phillip S. Thomas
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Terry A. Miller
- Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus, Ohio 43210, United States
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Kurtén T, Lane JR, Jørgensen S, Kjaergaard HG. A Computational Study of the Oxidation of SO2 to SO3 by Gas-Phase Organic Oxidants. J Phys Chem A 2011; 115:8669-81. [DOI: 10.1021/jp203907d] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Theo Kurtén
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
- Department of Physics, University of Helsinki, POB 64, FIN-00014 Helsinki, Finland
| | - Joseph R. Lane
- Department of Chemistry, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Solvejg Jørgensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
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