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Savee JD, Sztáray B, Welz O, Taatjes CA, Osborn DL. Valence Photoionization and Autoionization of the Formyl Radical. J Phys Chem A 2021; 125:3874-3884. [PMID: 33929204 DOI: 10.1021/acs.jpca.1c01775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have used 308 nm photolysis of acetaldehyde to measure a photoionization spectrum of the formyl (HCO) radical between 8 and 11.5 eV using an 11 meV FWHM photoionization energy resolution. We have confirmed that the formyl radical is the carrier of the spectrum by generating an identical spectrum of the HCO product in the Cl + H2CO reaction. The spectrum of HCO and its deuterated isotopologue (DCO) have several resolved autoionizing resonances above the Franck-Condon envelope, which we assign to autoionization after initial excitation into neutral 3sσ and 3p Rydberg states converging to the first triplet excited state of HCO+(ã 3A'). The quantum defects for these states are δ3sσ = 1.06 ± 0.02 and δ3p = 0.821 ± 0.019. We report absolute photoionization cross-section measurements of σHCOPI(9.907 eV) = 4.5 ± 0.9 Mb, σHCOPI(10.007 eV) = 4.8 ± 1.0 Mb, σHCOPI(10.107 eV) = 6.0 ± 1.2 Mb, σHCOPI(10.107 eV) = 5.7 ± 1.2 Mb, and σHCOPI(10.304 eV) = 10.6 ± 2.2 Mb relative to the photoionization cross section of the methyl radical. The absolute cross-section measurements are a factor of ∼1.5 larger than those determined in past studies, although the presence of strong autoionizing features supports a dependence on photoionization energy resolution. We propose that the semiempirical model of Xu and Pratt for estimation of free radical photoionization cross sections is more accurate when applied with a reference species containing the same atoms as the free radical rather than isoelectronic species with different atoms.
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Affiliation(s)
- John D Savee
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Bálint Sztáray
- Department of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Oliver Welz
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States.,Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
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Zhu C, Xiang B, Chu LT, Zhu L. 308 nm Photolysis of Nitric Acid in the Gas Phase, on Aluminum Surfaces, and on Ice Films. J Phys Chem A 2010; 114:2561-8. [DOI: 10.1021/jp909867a] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chengzhu Zhu
- Wadsworth Center, New York State Department of Health and Department of Environmental Health Sciences, State University of New York, Albany, New York 12201-0509, and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
| | - Bin Xiang
- Wadsworth Center, New York State Department of Health and Department of Environmental Health Sciences, State University of New York, Albany, New York 12201-0509, and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
| | - Liang T. Chu
- Wadsworth Center, New York State Department of Health and Department of Environmental Health Sciences, State University of New York, Albany, New York 12201-0509, and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
| | - Lei Zhu
- Wadsworth Center, New York State Department of Health and Department of Environmental Health Sciences, State University of New York, Albany, New York 12201-0509, and School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
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Chiper AS, Blin-Simiand N, Heninger M, Mestdagh H, Boissel P, Jorand F, Lemaire J, Leprovost J, Pasquiers S, Popa G, Postel C. Detailed Characterization of 2-Heptanone Conversion by Dielectric Barrier Discharge in N2 and N2/O2 Mixtures. J Phys Chem A 2009; 114:397-407. [DOI: 10.1021/jp907295d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alina Silvia Chiper
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Nicole Blin-Simiand
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Michel Heninger
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Hélène Mestdagh
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Pierre Boissel
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - François Jorand
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Joël Lemaire
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Julien Leprovost
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Stéphane Pasquiers
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Gheorghe Popa
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
| | - Christian Postel
- Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania, and Laboratoire de Physique des Gaz et des Plasmas, Université Paris-Sud/CNRS (UMR 8578), Bât. 210, AlyXan, Université Paris-Sud, Bât. 207B, and Laboratoire de Chimie Physique, Université Paris-Sud/CNRS (UMR 8000), Bât. 210, 91405 Orsay, France
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