1
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Catone D, Castrovilli MC, Nicolanti F, Satta M, Cartoni A. Formation of H 3O + and OH by CO 2 and N 2O trace gases in the atmospheric environment. Phys Chem Chem Phys 2023; 25:25619-25628. [PMID: 37721164 DOI: 10.1039/d3cp02427j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
The impact of cosmic rays' energetic subatomic particles on climate and global warming is still controversial and under debate. Cosmic rays produce ions that can trigger fast reactions affecting chemical networks in the troposphere and stratosphere especially when a large amount of relevant trace gases such as carbon dioxide, methane, sulfur dioxide and water are injected by volcanic eruptions. This work focuses on synchrotron experiments and an ab initio theoretical study of the ion chemistry of carbon dioxide and nitrous oxide radical cations reacting with water. These molecules catalyze a fast exothermic formation of hydronium ions H3O+ and the hydroxyl radical OH, the main oxidant in the atmosphere. Moreover, theoretical calculations demonstrate that at the end of the catalytic cycle, CO2 and N2O are produced vibrationally excited and subsequently they quench in the microsecond time scale by collision with the surrounding atmospheric molecules at the pressure and temperature of the upper-troposphere/stratosphere. The chemistry involved in these reactions has a strong impact on the oxidant capacity of the atmosphere, on the sulfate aerosol production, on the cloud formation and eventually on the chemical networks controlling climate and global warming models.
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Affiliation(s)
- Daniele Catone
- Istituto di Struttura della Materia - CNR (ISM-CNR), Area della Ricerca di Roma 2, Via del Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Mattea Carmen Castrovilli
- Istituto di Struttura della Materia - CNR (ISM-CNR), Area della Ricerca di Roma 1, Monterotondo Scalo 00015, Italy
| | - Francesca Nicolanti
- Department of Physics, Sapienza University of Rome, P. le Aldo Moro 5, Rome, 00185, Italy
| | - Mauro Satta
- Institute for the Study of Nanostructured Materials-CNR (ISMN-CNR), Department of Chemistry, Sapienza University of Rome, P. le Aldo Moro 5, Rome, 00185, Italy.
- Department of Chemistry, Sapienza University of Rome, P. le Aldo Moro 5, Rome, 00185, Italy.
| | - Antonella Cartoni
- Department of Chemistry, Sapienza University of Rome, P. le Aldo Moro 5, Rome, 00185, Italy.
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2
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Photodissociation dynamics of carbon dioxide cation via the vibrationally mediated A~2Πu,1/2υ1,υ2,0/B~2Σu+0,0,0 states in the wavelength range of 282–293 nm. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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3
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Tang X, Garcia GA, Nahon L. High resolution vibronic state-specific dissociation of NO2+in the 10.0–15.5 eV energy range by synchrotron double imaging photoelectron photoion coincidence. Phys Chem Chem Phys 2020; 22:1974-1982. [DOI: 10.1039/c9cp05847h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low-lying electronic states of NO2+are prepared with vibrational structures and their state-specific dissociation mechanisms are unraveled with high-resolution i2PEPICO.
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Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | | | - Laurent Nahon
- Synchrotron SOLEIL
- L’Orme des Merisiers
- 91192 Gif sur Yvette
- France
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4
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Ascenzi D, Romanzin C, Lopes A, Tosi P, Žabka J, Polášek M, Shaffer CJ, Alcaraz C. State-Selected Reactivity of Carbon Dioxide Cations ( CO 2 + ) With Methane. Front Chem 2019; 7:537. [PMID: 31428598 PMCID: PMC6688064 DOI: 10.3389/fchem.2019.00537] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 07/15/2019] [Indexed: 11/22/2022] Open
Abstract
The reactivity ofCO 2 + with CD4 has been experimentally investigated for its relevance in the chemistry of plasmas used for the conversion of CO2 in carbon-neutral fuels. Non-equilibrium plasmas are currently explored for their capability to activate very stable molecules (such as methane and carbon dioxide) and initiate a series of reactions involving highly reactive species (e.g., radicals and ions) eventually leading to the desired products. Energy, in the form of kinetic or internal excitation of reagents, influences chemical reactions. However, putting the same amount of energy in a different form may affect the reactivity differently. In this paper, we investigate the reaction ofCO 2 + with methane by changing either the kinetic energy ofCO 2 + or its vibrational excitation. The experiments were performed by a guided ion beam apparatus coupled to synchrotron radiation in the VUV energy range to produce vibrationally excited ions. We find that the reactivity depends on the reagent collision energy, but not so much on the vibrational excitation ofCO 2 + . Concerning the product branching ratios (CD 4 + /CD 3 + /DOCO+) there is substantial disagreement among the values reported in the literature. We find that the dominant channel is the production ofCD 4 + , followed by DOCO+ andCD 3 + , as a minor endothermic channel.
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Affiliation(s)
| | - Claire Romanzin
- Laboratoire de Chimie Physique, Bât. 350, UMR 8000, CNRS-Univ. Paris-Sud and Paris Saclay, Centre Universitaire Paris-Sud, Orsay, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, Gif-sur-Yvette, France
| | - Allan Lopes
- Laboratoire de Chimie Physique, Bât. 350, UMR 8000, CNRS-Univ. Paris-Sud and Paris Saclay, Centre Universitaire Paris-Sud, Orsay, France
| | - Paolo Tosi
- Department of Physics, University of Trento, Trento, Italy
| | - Jan Žabka
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Miroslav Polášek
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Christopher J. Shaffer
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia
| | - Christian Alcaraz
- Laboratoire de Chimie Physique, Bât. 350, UMR 8000, CNRS-Univ. Paris-Sud and Paris Saclay, Centre Universitaire Paris-Sud, Orsay, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, Gif-sur-Yvette, France
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5
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Dyke JM. Photoionization studies of reactive intermediates using synchrotron radiation. Phys Chem Chem Phys 2019; 21:9106-9136. [DOI: 10.1039/c9cp00623k] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoionization with synchrotron radiation enables sensitive and selective monitoring of reactive intermediates in environments such as flames and plasmas.
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6
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Baer T, Tuckett RP. Advances in threshold photoelectron spectroscopy (TPES) and threshold photoelectron photoion coincidence (TPEPICO). Phys Chem Chem Phys 2017; 19:9698-9723. [DOI: 10.1039/c7cp00144d] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The history and evolution of molecular threshold photoelectron spectroscopy and threshold photoelectron photoion coincidence spectroscopy (TPEPICO) over the last fifty years are reviewed.
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Affiliation(s)
- Tomas Baer
- Chemistry Department
- University of North Carolina
- Chapel Hill
- USA
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7
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Schio L, Alagia M, Dias AA, Falcinelli S, Zhaunerchyk V, Lee EPF, Mok DKW, Dyke JM, Stranges S. A Study of H2O2 with Threshold Photoelectron Spectroscopy (TPES) and Electronic Structure Calculations: Redetermination of the First Adiabatic Ionization Energy (AIE). J Phys Chem A 2016; 120:5220-9. [DOI: 10.1021/acs.jpca.6b01039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luca Schio
- IOM-CNR Tasc Laboratory, SS-14,
Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Michele Alagia
- IOM-CNR Tasc Laboratory, SS-14,
Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Antonio A. Dias
- LIBPhys-UNL,
Laboratory for Instrumentation, Biomedical Engineering and Radiation
Physics, Departamento de Física, Faculdade de Ciências
e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Stefano Falcinelli
- Dipartimento
di Ingegneria Civile ed Ambientale, Università di Perugia, 06125 Perugia, Italy
| | - Vitali Zhaunerchyk
- Department
of Physics, University of Gothenburg, 41296 Gothenburg, Sweden
| | - Edmond P. F. Lee
- School
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
- Department
of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Daniel K. W. Mok
- Department
of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - John M. Dyke
- School
of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
| | - Stefano Stranges
- IOM-CNR Tasc Laboratory, SS-14,
Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
- Department
of Chemistry and Drug Technologies, Sapienza University, P.le A. Moro
5, 00185 Rome, Italy
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8
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Holzmeier F, Lang M, Fischer I, Tang X, Cunha de Miranda B, Romanzin C, Alcaraz C, Hemberger P. Threshold photoelectron spectroscopy of unstable N-containing compounds: Resolution of ΔK subbands in HNCO+ and vibrational resolution in NCO+. J Chem Phys 2015; 142:184306. [DOI: 10.1063/1.4920951] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Fabian Holzmeier
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Melanie Lang
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Xiaofeng Tang
- Synchrotron SOLEIL, l’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Barbara Cunha de Miranda
- Laboratoire de Chimie-Physique, UMR 8000 CNRS and Université Paris-Sud 11, F-91405 Orsay Cedex, France
| | - Claire Romanzin
- Laboratoire de Chimie-Physique, UMR 8000 CNRS and Université Paris-Sud 11, F-91405 Orsay Cedex, France
| | - Christian Alcaraz
- Laboratoire de Chimie-Physique, UMR 8000 CNRS and Université Paris-Sud 11, F-91405 Orsay Cedex, France
| | - Patrick Hemberger
- Molecular Dynamics Group, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
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9
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Furch FJ, Birkner S, Jungmann JH, Kelkensberg F, Schulz CP, Rouzée A, Vrakking MJJ. Photoelectron imaging of XUV photoionization of CO2 by 13–40 eV synchrotron radiation. J Chem Phys 2013; 139:124309. [DOI: 10.1063/1.4820947] [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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10
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Mollet S, Merkt F. The X+ 2Πg, A+ 2Πu, B+ 2Δu, and a+ 4Σu(-) electronic states of Cl2(+) studied by high-resolution photoelectron spectroscopy. J Chem Phys 2013; 139:034302. [PMID: 23883022 DOI: 10.1063/1.4812376] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Partially rotationally resolved pulsed-field-ionization zero-kinetic-energy photoelectron spectra of the three isotopomers ((35)Cl2, (35)Cl(37)Cl, and (37)Cl2) of Cl2 have been recorded in the wavenumber ranges 92,500-96,500 cm(-1), corresponding to transitions to the low vibrational levels of the X(+) (2)Πg (Ω = 3∕2, 1∕2) ground state of Cl2 (+), and 106,750-115,500 cm(-1), where the a(+) (4)Σu (-)←X(1)Σg (+), A(+) (2)Πu←X(1)Σg (+), and B(+) (2)Δu←X(1)Σg (+) band systems overlap with transitions to high vibrational levels (v(+) > 25) of the X(+) state. The observation of Franck-Condon-forbidden transitions to vibrational levels of the X(+) state of the cation with v(+) ≥ 25 is rationalized by a mechanism involving vertical excitation of predissociative Rydberg states of mixed singlet-triplet character with an A(+) ion core which are coupled to Rydberg states converging to high-v(+) levels of the X(+) state. The same mechanism is proposed to also be responsible for the observation of Cl(+) - Cl(-) ion pairs and quartet states in the photoionization of Cl2. The potential energy function of the X(+) state of Cl2 (+) was determined in a direct fit to the experimental data. Transitions to vibrational levels of the A(+) (2)Πu, 3∕2 and B(+) (2)Δu, 3∕2 states of Cl2 (+) could be identified using the results of a recent analysis of the strong perturbation between the A(+) (2)Πu, 3∕2 and B(+) (2)Δu, 3∕2 states of Cl2 (+) observed in the A(+) - X(+) band system [Gharaibeh et al., J. Chem. Phys. 137, 194317 (2012)], and transitions to several vibrational levels of the upper spin-orbit component ((2)Πu, 1∕2) of the A(+) state were detected in the photoelectron spectrum of Cl2 (+). The a(+) (4)Σu (-)←X(1)Σg (+) photoelectron band system, which is nominally forbidden by single-photon ionization from the ground state was also observed for the first time and its vibrational and spin-orbit structures were analyzed. The (4)Σu (-) state is split into two spin-orbit components with Ω = 1∕2 and Ω = 3∕2, separated by 37.5 cm(-1). The vibrational energy level structure of both components is regular, which indicates that the splitting results from the interaction with one or more distant ungerade Ω = 1∕2 or Ω = 3∕2 electronic states.
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Affiliation(s)
- Sandro Mollet
- Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
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11
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The design and performance of a velocity map imaging spectrometer for the study of molecular photoionisation dynamics. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.09.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Kivimäki A, Alagia M, Richter R. X-ray emission–photoion coincidence spectroscopy of the CO2 molecule at the O 1s edge. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.02.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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13
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Parkes MA, Lockyear JF, Price SD, Schröder D, Roithová J, Herman Z. Selective dissociation in dication–molecule reactions. Phys Chem Chem Phys 2010; 12:6233-43. [DOI: 10.1039/b926049h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Meng Q, Huang MB, Chang HB. Theoretical Study on the Predissociation Mechanism of CO2+ (C 2Σg+). J Phys Chem A 2009; 113:12825-30. [DOI: 10.1021/jp907351s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qingyong Meng
- College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, People’s Republic of China
| | - Ming-Bao Huang
- College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, People’s Republic of China
| | - Hai-Bo Chang
- College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, P.O. Box 4588, Beijing 100049, People’s Republic of China
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15
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Yang M, Zhang L, Lai L, Zhou D, Wang J, Sun Q. Study on the [1+1′] photodissociation spectra of CO2+ via C2Σg+←B2Σu+/A2Πu,1/2←X2Πg,1/2 transitions. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Innocenti F, Eypper M, Lee E, Stranges S, Mok D, Chau FT, King G, Dyke J. Difluorocarbene Studied with Threshold Photoelectron Spectroscopy (TPES): Measurement of the First Adiabatic Ionization Energy (AIE) of CF2. Chemistry 2008; 14:11452-60. [DOI: 10.1002/chem.200801699] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Johnson MA, Rostas J. Vibronic structure of the CO2+ion: reinvestigation of the antisymmetric stretch vibration in the [Xtilde], Ã, and [Btilde] states. Mol Phys 2008. [DOI: 10.1080/00268979500101521] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Innocenti F, Eypper M, Beccaceci S, Morris A, Stranges S, West JB, King GC, Dyke JM. A Study of the Reactive Intermediate IF and I Atoms with Photoelectron Spectroscopy. J Phys Chem A 2008; 112:6939-49. [DOI: 10.1021/jp803141c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Fabrizio Innocenti
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - Marie Eypper
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - Sonya Beccaceci
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - Alan Morris
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - Stefano Stranges
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - John B. West
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - George C. King
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
| | - John M. Dyke
- Department of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Department of Chemistry and INSTM Unit, “La Sapienza”, University of Rome, Italy, ISNM-CNR sez. Roma La Sapienza and Laboratorio TASC-INFM-CNR, Trieste, Italy, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K., and Department of Physics, Manchester University, Manchester M13 9PL, U.K
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19
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Yang M, Zhang L, Zhuang X, Lai L, Yu S. The [1+1] two-photon dissociation spectra of CO2+ via ÃΠu,1∕22(υ1υ20)←X̃Πg,1∕22(000) transitions. J Chem Phys 2008; 128:164308. [DOI: 10.1063/1.2905232] [Citation(s) in RCA: 12] [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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20
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Shaw D, Holland D, Poole I, Södergren S, Öhrwall G, Karlsson L, Chau F, Mok DW. A study of vibronic coupling in excited neutral and ionic states of carbon dioxide. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.09.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Sommavilla M, Merkt F. Pulsed-Field-Ionization Zero-Kinetic-Energy (PFI-ZEKE) Photoelectron Spectroscopic Study of the Renner−Teller Effect in the Ã+ 2Π State of OCS+. J Phys Chem A 2004. [DOI: 10.1021/jp0478458] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Sommavilla
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
| | - F. Merkt
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
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22
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Rathbone GJ, Poliakoff ED, Bozek JD, Lucchese RR, Lin P. Mode-specific photoelectron scattering effects on CO2+(C 2Σg+) vibrations. J Chem Phys 2004; 120:612-22. [PMID: 15267895 DOI: 10.1063/1.1630303] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using high-resolution photoelectron spectroscopy, we have determined the energy dependent vibrational branching ratios for the symmetric stretch [v+ = (100)], bend [v+ = (010)], and antisymmetric stretch [v+ = (001)], as well as several overtones and combination bands in the 4sigmag(-1) photoionization of CO2. Data were acquired over the range from 20-110 eV, and this wide spectral coverage highlighted that alternative vibrational modes exhibit contrasting behavior, even over a range usually considered to be dominated by atomic effects. Alternative vibrational modes exhibit qualitatively distinct energy dependences, and this contrasting mode-specific behavior underscores the point that vibrationally resolved measurements reflect the sensitivity of the electron scattering dynamics to well-defined changes in molecular geometry. In particular, such energy-dependent studies help to elucidate the mechanism(s) responsible for populating the symmetry forbidden vibrational levels [i.e., v+ =( 010), (001), (030), and (110)]. This is the first study in which vibrationally resolved data have been acquired as a function of energy for all of the vibrational modes of a polyatomic system. Theoretical Schwinger variational calculations are used to interpret the experimental data, and they indicate that a 4sigmag-->ksigmau shape resonance is responsible for most of the excursions observed for the vibrational branching ratios. Generally, the energy dependent trends are reproduced well by theory, but a notable exception is the symmetric stretch vibrational branching ratio. The calculated results display a strong peak in the vibrational branching ratio while the experimental data show a pronounced minimum. This suggests an interference mechanism that is not accounted for in the single-channel adiabatic-nuclei calculations. Electronic branching ratios were also measured and compared to the vibrational branching ratios to assess the relative contributions of interchannel (i.e., Herzberg-Teller) versus intrachannel (i.e., photoelectron-mediated) coupling.
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Affiliation(s)
- G J Rathbone
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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23
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Liu J, Chen W, Hochlaf M, Qian X, Chang C, Ng CY. Unimolecular decay pathways of state-selected CO2+ in the internal energy range of 5.2–6.2 eV: An experimental and theoretical study. J Chem Phys 2003. [DOI: 10.1063/1.1524180] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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