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Tenorio BNC, Oliveira RR, Coriani S. Insights on the site-selective fragmentation of CF2Cl2 and CH2Cl2 at the chlorine K-edge from ab initio calculations. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2021.111226] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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2
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Kokkonen E, Jänkälä K, Patanen M, Cao W, Hrast M, Bučar K, Žitnik M, Huttula M. Role of ultrafast dissociation in the fragmentation of chlorinated methanes. J Chem Phys 2018; 148:174301. [PMID: 29739226 DOI: 10.1063/1.5026720] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photon-induced fragmentation of a full set of chlorinated methanes (CH3Cl, CH2Cl2, CHCl3, CCl4) has been investigated both experimentally and computationally. Using synchrotron radiation and electron-ion coincidence measurements, the dissociation processes were studied after chlorine 2p electron excitation. Experimental evidence for CH3Cl and CH2Cl2 contains unique features suggesting that fast dissociation processes take place. By contrast, CHCl3 and CCl4 molecules do not contain the same features, hinting that they experience alternative mechanisms for dissociation and charge migration. Computational work indicates differing rates of charge movement after the core-excitation, which can be used to explain the differences observed experimentally.
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Affiliation(s)
- E Kokkonen
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - K Jänkälä
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - M Patanen
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - W Cao
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - M Hrast
- Jožef Stefan Institute, P.O. Box 3000, SI-1001 Ljubljana, Slovenia
| | - K Bučar
- Jožef Stefan Institute, P.O. Box 3000, SI-1001 Ljubljana, Slovenia
| | - M Žitnik
- Jožef Stefan Institute, P.O. Box 3000, SI-1001 Ljubljana, Slovenia
| | - M Huttula
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
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3
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Varas LR, Coutinho LH, Bernini RB, Betancourt A, de Moura CEV, Rocha AB, de Souza GGB. Breaking the disulfide chemical bond using high energy photons: the dimethyl disulfide and methyl propyl disulfide molecules. RSC Adv 2017. [DOI: 10.1039/c7ra05001a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In order to study the stability of the disulfide chemical bond in molecules subjected to a flux of high energy photons, the ionic fragmentation of DMDS and MPDS has been studied following excitation around the S 1s edge (∼2470 eV).
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Affiliation(s)
- L. R. Varas
- Escuela de Ingeniería Química
- Universidad de Costa Rica
- Sede Central Rodrigo Facio
- Facultad de Ingeniería
- 11501-2060 San José
| | - L. H. Coutinho
- Instituto de Física
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - R. B. Bernini
- Instituto Federal de Ciência e Tecnologia do Rio de Janeiro (IFRJ)
- Duque de Caxias
- Brazil
| | - A. M. Betancourt
- Escuela de Ingeniería Química
- Universidad de Costa Rica
- Sede Central Rodrigo Facio
- Facultad de Ingeniería
- 11501-2060 San José
| | - C. E. V. de Moura
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - A. B. Rocha
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - G. G. B. de Souza
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
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4
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Bohinc R, Žitnik M, Bučar K, Kavčič M, Carniato S, Journel L, Guillemin R, Marchenko T, Kawerk E, Simon M, Cao W. Structural and dynamical properties of chlorinated hydrocarbons studied with resonant inelastic x-ray scattering. J Chem Phys 2016; 144:134309. [PMID: 27059572 DOI: 10.1063/1.4945402] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
We present a theoretical and experimental study of resonant inelastic x-ray scattering on a large group of chlorinated hydrocarbons: CH3Cl, CH2Cl2, CHCl3, CCl4, CH3CH2Cl, ClCH2CH2Cl, CH3CHCl2, CH3CCl3, C2H2Cl2-iso, C2H2Cl2-cis, C2H2Cl2-trans, and C6H5Cl. Differences in structural and dynamical properties of the molecules generated by diverse chemical environments are observed in the measured Cl(K(α)) spectral maps as well as in the Cl(K) total fluorescence yield spectra. The energy position, relative intensity, and the width of the Franck-Condon distribution of low-lying σ* and π* resonances are extracted by a fitting procedure taking into account the experimental broadening. The theoretical values obtained with the transition potential and Δ Kohn-Sham methods are in good agreement with the experimental parameters indicating subtle differences due to variations in the molecular structure.
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Affiliation(s)
- R Bohinc
- Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
| | - M Žitnik
- Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
| | - K Bučar
- Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
| | - M Kavčič
- Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
| | - S Carniato
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - L Journel
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - R Guillemin
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - T Marchenko
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - E Kawerk
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - M Simon
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiére et Rayonnement, F-75005 Paris, France
| | - W Cao
- Research Centre for Molecular Materials, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
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Alcantara KF, Gomes AHA, Wolff W, Sigaud L, Santos ACF. Strong Electronic Selectivity in the Shallow Core Excitation of the CH2Cl2 Molecule. J Phys Chem A 2015. [DOI: 10.1021/acs.jpca.5b04402] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. F. Alcantara
- Instituto
de Física, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, RJ, Brazil
| | - A. H. A. Gomes
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859 Campinas, SP, Brazil
| | - W. Wolff
- Instituto
de Física, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, RJ, Brazil
| | - L. Sigaud
- Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil
| | - A. C. F. Santos
- Instituto
de Física, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, RJ, Brazil
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Lago AF, Januário RD, Simon M, Dávalos JZ. VUV photodissociation of thiazole molecule investigated by TOF-MS and photoelectron photoion coincidence spectroscopy. JOURNAL OF MASS SPECTROMETRY : JMS 2014; 49:1163-1170. [PMID: 25395132 DOI: 10.1002/jms.3443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 06/18/2014] [Accepted: 07/12/2014] [Indexed: 06/04/2023]
Abstract
Photoelectron photoion coincidence measurements have been performed for the thiazole (C3H3NS) molecule in gas phase, using time-of-flight mass spectrometry in the electron-ion coincidence mode and vacuum ultraviolet synchrotron radiation. photoelectron photoion coincidence spectra have been recorded as a function of the photon energy covering the valence range from 10 to 21 eV. The resulting photoionization products as well as the dissociation pathways leading to the ionic species were proposed and discussed. We have also performed density functional theory and ab initio calculations for the neutral molecule, its cation and the ion fragments produced in order to determine their electronic and structural parameters.
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Affiliation(s)
- A F Lago
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Rua Santa Adélia 166, 09210-170, Santo André, SP, Brazil
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Bohinc R, Žitnik M, Bučar K, Kavčič M, Journel L, Guillemin R, Marchenko T, Simon M, Cao W. Dissociation of chloromethanes upon resonant σ* excitation studied by x-ray scattering. J Chem Phys 2013; 139:134302. [DOI: 10.1063/1.4822326] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- R Bohinc
- Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
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Lu KT, Chen JM, Lee JM, Haw SC. Enhanced production of anionic and excited neutral fragments of gaseous HCCl3 near the Cl 2p1/2,3/2 ionization threshold. RSC Adv 2013. [DOI: 10.1039/c3ra23038d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Bowen KP, Stolte WC, Lago AF, Dávalos JZ, Piancastelli MN, Lindle DW. Partial-ion-yield studies of SOCl2 following x-ray absorption around the S and Cl K edges. J Chem Phys 2012. [PMID: 23206009 DOI: 10.1063/1.4768044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
We present a series of photoabsorption and partial-ion-yield experiments on thionyl chloride, SOCl(2), at both the sulfur and chlorine K edges. The photoabsorption results exhibit better resolution than previously published data, leading to alternate spectral assignments for some of the features, particularly in the Rydberg-series region. Based on measured fragmentation patterns, we suggest the LUMO, of a(') character, is delocalized over the entire molecular skeleton. Unusual behavior of the S(2 +) fragment hints at a relatively localized bond rupture (the S-O bond below the S K edge and the S-Cl bonds below the Cl K edge) following excitation to some of the higher lying intermediate states.
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Affiliation(s)
- K P Bowen
- Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
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Lago A, Cavasso-Filho R, de Souza G, Santos A, Stolte W, Schlachter A. Anionic and cationic photodissociation of the chloroform molecule excited in the vicinity of the Cl 1s edge. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.06.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Tian SX. Photoion-pair dissociation dynamics of polyatomic molecules with synchrotron radiation. Phys Chem Chem Phys 2012; 14:6433-43. [DOI: 10.1039/c2cp23763f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lu KT, Chen JM, Lee JM, Haw SC, Liang YC, Deng MJ. Core-level positive-ion and negative-ion fragmentation of gaseous and condensed HCCl3 using synchrotron radiation. J Chem Phys 2011; 135:044303. [DOI: 10.1063/1.3615626] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Pilling S, Lago AF, Coutinho LH, de Castilho RB, de Souza GGB, de Brito AN. Dissociative photoionization of adenine following valence excitation. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:3646-3652. [PMID: 17937451 DOI: 10.1002/rcm.3259] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We present results on the valence level excitation, ionization and dissociation of adenine, using time-of-flight mass spectrometry and synchrotron radiation, in the vacuum ultraviolet (VUV) range of 12-21 eV. The measurements were performed using a gas-phase (Ne) harmonics filter in order to eliminate contributions from higher-order harmonics. Mass spectra were obtained using the photoelectron-photoion coincidence technique (PEPICO). The relative abundances for each ionic fragment and their mean kinetic energy release have been determined from the analysis of the corresponding peak shapes in the mass spectra. Comparison with the available photoelectron spectra and previous measurements allowed the assignment of the main features in the spectra. A discussion on the dissociative photoionization channels of this molecule has also been included. Due to our harmonics-free incident photon beam we were able to propose new appearance energy (AE) for the most important ionic channels in this energy range. The precursor ion, C(5)H(5)N(5)+, is the most abundant species (40% at 15 eV and 20% at 20 eV), which confirms the high stability of adenine upon absorption of VUV photons. We have observed other intense fragment ions such as: C(4)H(4)N(4)+, C(3)H(3)N(3) (+), C(2)H(2)N(2)+ and HCNH+. The production of the neutral HCN fragment represents up to 40% of the dissociative channels for this molecule as induced by VUV photons.
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Affiliation(s)
- S Pilling
- Laboratório Nacional de Luz Síncrotron (LNLS), Box 6192, Campinas, SP, 13084-971, Brazil.
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