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Electron Impact Ionization of Adenine: Partial Cross Sections. ATOMS 2022. [DOI: 10.3390/atoms10040100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Electron ionization of a genetically important nucleobase, adenine, was investigated from threshold to 500 eV using crossed electron beam–effusive molecular beam geometry and time-of-flight mass spectrometry. We measured the complete set of absolute partial cross sections for adenine using the relative flow technique (RFT) up to an electron energy of 500 eV. Normalization to absolute values was performed using electron ionization cross sections for argon and the vapor pressure data of adenine. The total cross sections obtained by summing the partial cross sections were compared with the existing theoretical and experimental data. The appearance energies of various fragment ions were also measured and compared with the reported data. The prominence of ions with mass (HCN)n+ (n = 1 to 5) indicated a possible pathway to form adenine in the interstellar medium through aggregation of HCN units. Analysis of the partial cross sections for various groups of fragment ions as a function of electron energy was found to give insights into their composition.
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2
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Månsson EP, Latini S, Covito F, Wanie V, Galli M, Perfetto E, Stefanucci G, Hübener H, De Giovannini U, Castrovilli MC, Trabattoni A, Frassetto F, Poletto L, Greenwood JB, Légaré F, Nisoli M, Rubio A, Calegari F. Real-time observation of a correlation-driven sub 3 fs charge migration in ionised adenine. Commun Chem 2021; 4:73. [PMID: 36697766 PMCID: PMC9814501 DOI: 10.1038/s42004-021-00510-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 04/19/2021] [Indexed: 01/28/2023] Open
Abstract
Sudden ionisation of a relatively large molecule can initiate a correlation-driven process dubbed charge migration, where the electron density distribution is expected to rapidly move along the molecular backbone. Capturing this few-femtosecond or attosecond charge redistribution would represent the real-time observation of electron correlation in a molecule with the enticing prospect of following the energy flow from a single excited electron to the other coupled electrons in the system. Here, we report a time-resolved study of the correlation-driven charge migration process occurring in the nucleic-acid base adenine after ionisation with a 15-35 eV attosecond pulse. We find that the production of intact doubly charged adenine - via a shortly-delayed laser-induced second ionisation event - represents the signature of a charge inflation mechanism resulting from many-body excitation. This conclusion is supported by first-principles time-dependent simulations. These findings may contribute to the control of molecular reactivity at the electronic, few-femtosecond time scale.
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Affiliation(s)
- Erik P. Månsson
- grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,Institute for Photonics and Nanotechnologies CNR-IFN, Milano, Italy
| | - Simone Latini
- grid.469852.40000 0004 1796 3508Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany
| | - Fabio Covito
- grid.469852.40000 0004 1796 3508Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany
| | - Vincent Wanie
- grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,Institute for Photonics and Nanotechnologies CNR-IFN, Milano, Italy ,INRS-EMT, Varennes, QC Canada
| | - Mara Galli
- grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,grid.4643.50000 0004 1937 0327Department of Physics, Politecnico di Milano, Milano, Italy
| | - Enrico Perfetto
- grid.472712.5CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Monterotondo Scalo, Italy ,grid.6530.00000 0001 2300 0941Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy
| | - Gianluca Stefanucci
- grid.6530.00000 0001 2300 0941Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy ,grid.470219.9INFN, Sezione di Roma Tor Vergata, Roma, Italy
| | - Hannes Hübener
- grid.469852.40000 0004 1796 3508Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany
| | - Umberto De Giovannini
- grid.469852.40000 0004 1796 3508Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany ,grid.10776.370000 0004 1762 5517Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Palermo, Italy
| | - Mattea C. Castrovilli
- Institute for Photonics and Nanotechnologies CNR-IFN, Milano, Italy ,Institute for the Structure of Matter CNR-ISM, Monterotondo Scalo, Italy
| | - Andrea Trabattoni
- grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Fabio Frassetto
- Institute for Photonics and Nanotechnologies CNR-IFN, Padova, Italy
| | - Luca Poletto
- Institute for Photonics and Nanotechnologies CNR-IFN, Padova, Italy
| | - Jason B. Greenwood
- grid.4777.30000 0004 0374 7521Centre for Plasma Physics, School of Maths and Physics, Queen’s University Belfast, Belfast, UK
| | | | - Mauro Nisoli
- Institute for Photonics and Nanotechnologies CNR-IFN, Milano, Italy ,grid.4643.50000 0004 1937 0327Department of Physics, Politecnico di Milano, Milano, Italy
| | - Angel Rubio
- grid.469852.40000 0004 1796 3508Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, Hamburg, Germany ,Center for Computational Quantum Physics (CCQ), The Flatiron Institute, New York, NY USA
| | - Francesca Calegari
- grid.7683.a0000 0004 0492 0453Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany ,Institute for Photonics and Nanotechnologies CNR-IFN, Milano, Italy ,grid.9026.d0000 0001 2287 2617Institut fur Experimentalphysik, Universität Hamburg, Hamburg, Germany
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3
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Lago AF, de Rogério DO, Farias DB, Cavasso-Filho RL, Dávalos JZ. Investigation of the molecular structure and VUV-induced ion dissociation dynamics of 2-azetidinone (C 3 H 5 NO). RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2021; 35:e8988. [PMID: 33095953 DOI: 10.1002/rcm.8988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Alexsandre F Lago
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil
| | - Diego O de Rogério
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil
| | - Dayane B Farias
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil
| | - Reinaldo L Cavasso-Filho
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil
| | - Juan Z Dávalos
- Instituto de Química Física Rocasolano, CSIC, Madrid, 28006, Spain
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4
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Cunha T, Mendes M, Ferreira da Silva F, Eden S, García G, Bacchus-Montabonel MC, Limão-Vieira P. Electron transfer driven decomposition of adenine and selected analogs as probed by experimental and theoretical methods. J Chem Phys 2018; 148:134301. [PMID: 29626890 DOI: 10.1063/1.5021888] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report on a combined experimental and theoretical study of electron-transfer-induced decomposition of adenine (Ad) and a selection of analog molecules in collisions with potassium (K) atoms. Time-of-flight negative ion mass spectra have been obtained in a wide collision energy range (6-68 eV in the centre-of-mass frame), providing a comprehensive investigation of the fragmentation patterns of purine (Pu), adenine (Ad), 9-methyl adenine (9-mAd), 6-dimethyl adenine (6-dimAd), and 2-D adenine (2-DAd). Following our recent communication about selective hydrogen loss from the transient negative ions (TNIs) produced in these collisions [T. Cunha et al., J. Chem. Phys. 148, 021101 (2018)], this work focuses on the production of smaller fragment anions. In the low-energy part of the present range, several dissociation channels that are accessible in free electron attachment experiments are absent from the present mass spectra, notably NH2 loss from adenine and 9-methyl adenine. This can be understood in terms of a relatively long transit time of the K+ cation in the vicinity of the TNI tending to enhance the likelihood of intramolecular electron transfer. In this case, the excess energy can be redistributed through the available degrees of freedom inhibiting fragmentation pathways. Ab initio theoretical calculations were performed for 9-methyl adenine (9-mAd) and adenine (Ad) in the presence of a potassium atom and provided a strong basis for the assignment of the lowest unoccupied molecular orbitals accessed in the collision process.
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Affiliation(s)
- T Cunha
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - M Mendes
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - F Ferreira da Silva
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - S Eden
- School of Physical Sciences, The Open University, Walton Hall, MK7 6AA Milton Keynes, United Kingdom
| | - G García
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 113-bis, 28006 Madrid, Spain
| | - M-C Bacchus-Montabonel
- Institut Lumiére Matiére, Université Lyon, Université Claude Bernard Lyon 1, CNRS, 69622 Villeurbanne, France
| | - P Limão-Vieira
- Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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5
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Lago AF, Januário RD, Cavasso Filho RL, Simon M, Dávalos JZ. Photoionization and ionic dissociation of the C 3 H 3 NS molecule induced by soft X-ray near the C1s edge. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:657-663. [PMID: 28699688 DOI: 10.1002/jms.3968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 06/24/2017] [Accepted: 07/08/2017] [Indexed: 06/07/2023]
Abstract
Time of flight mass spectrometry, electron-ion coincidence, and ion yield spectroscopy were employed to investigate for the first time the thiazole (C3 H3 NS) molecule in the gas phase excited by synchrotron radiation in the soft X-ray domain. Total ion yield (TIY) and photoelectron-photoion coincidence (PEPICO) spectra were recorded as a function of the photon energy in the vicinity of the carbon K edge (C1s). The C1s resonant transitions as well as the core ionization thresholds have been determined from the profile of TIY spectrum, and the features were discussed. The corresponding partial ion yields were determined from the PEPICO spectra for the cation species produced upon the molecular photodissociation. Additional ab initio calculations have also been performed from where relevant structural and electronic configuration parameters were obtained for this molecule.
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Affiliation(s)
- A F Lago
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Av. dos Estados, 5001, 09210-580, Santo André, SP, Brazil
| | - R D Januário
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Av. dos Estados, 5001, 09210-580, Santo André, SP, Brazil
| | - R L Cavasso Filho
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Av. dos Estados, 5001, 09210-580, Santo André, SP, Brazil
| | - M Simon
- CNRS, UMR 7614, Laboratoire de Chimie Physique-Matiere et Rayonnement, Sorbonne Universités, UPMC-Univ Paris 06, F-75005, Paris, France
| | - J Z Dávalos
- Instituto de Química Física Rocasolano, CSIC, 28006, Madrid, Spain
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6
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Månsson EP, De Camillis S, Castrovilli MC, Galli M, Nisoli M, Calegari F, Greenwood JB. Ultrafast dynamics in the DNA building blocks thymidine and thymine initiated by ionizing radiation. Phys Chem Chem Phys 2017; 19:19815-19821. [DOI: 10.1039/c7cp02803b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Ultrafast dynamics and fragmentation of thymidine and thymine after ionization by attosecond extreme ultraviolet radiation studied in the time-domain.
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Affiliation(s)
- E. P. Månsson
- Institute for Photonics and Nanotechnologies CNR-IFN
- 20133 Milano
- Italy
| | - S. De Camillis
- Centre for Plasma Physics
- School of Maths and Physics
- Queen's University Belfast
- UK
| | - M. C. Castrovilli
- Institute for Photonics and Nanotechnologies CNR-IFN
- 20133 Milano
- Italy
- Inst. for the Structure of Matter CNR-ISM
- Monterotondo
| | - M. Galli
- Institute for Photonics and Nanotechnologies CNR-IFN
- 20133 Milano
- Italy
- Department of Physics
- Politecnico di Milano
| | - M. Nisoli
- Institute for Photonics and Nanotechnologies CNR-IFN
- 20133 Milano
- Italy
- Department of Physics
- Politecnico di Milano
| | - F. Calegari
- Institute for Photonics and Nanotechnologies CNR-IFN
- 20133 Milano
- Italy
- Center for Free-Electron Laser Science
- DESY
| | - J. B. Greenwood
- Centre for Plasma Physics
- School of Maths and Physics
- Queen's University Belfast
- UK
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7
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Shin JW, Bernstein ER. Vacuum ultraviolet photoionization of carbohydrates and nucleotides. J Chem Phys 2015; 140:044330. [PMID: 25669546 DOI: 10.1063/1.4862829] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Carbohydrates (2-deoxyribose, ribose, and xylose) and nucleotides (adenosine-, cytidine-, guanosine-, and uridine-5(')-monophosphate) are generated in the gas phase, and ionized with vacuum ultraviolet photons (VUV, 118.2 nm). The observed time of flight mass spectra of the carbohydrate fragmentation are similar to those observed [J.-W. Shin, F. Dong, M. Grisham, J. J. Rocca, and E. R. Bernstein, Chem. Phys. Lett. 506, 161 (2011)] for 46.9 nm photon ionization, but with more intensity in higher mass fragment ions. The tendency of carbohydrate ions to fragment extensively following ionization seemingly suggests that nucleic acids might undergo radiation damage as a result of carbohydrate, rather than nucleobase fragmentation. VUV photoionization of nucleotides (monophosphate-carbohydrate-nucleobase), however, shows that the carbohydrate-nucleobase bond is the primary fragmentation site for these species. Density functional theory (DFT) calculations indicate that the removed carbohydrate electrons by the 118.2 nm photons are associated with endocyclic C-C and C-O ring centered orbitals: loss of electron density in the ring bonds of the nascent ion can thus account for the observed fragmentation patterns following carbohydrate ionization. DFT calculations also indicate that electrons removed from nucleotides under these same conditions are associated with orbitals involved with the nucleobase-saccharide linkage electron density. The calculations give a general mechanism and explanation of the experimental results.
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Affiliation(s)
- Joong-Won Shin
- Division of Science, Governors State University, University Park, Illinois 60484-0975, USA
| | - Elliot R Bernstein
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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8
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Cole CA, Wang ZC, Snow TP, Bierbaum VM. Deprotonated Purine Dissociation: Experiments, Computations, and Astrobiological Implications. J Phys Chem A 2015; 119:334-43. [DOI: 10.1021/jp509012s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Callie A. Cole
- Department
of Chemistry and Biochemistry, University of Colorado, 215 UCB, Boulder, Colorado 80309, United States
| | - Zhe-Chen Wang
- Department
of Chemistry and Biochemistry, University of Colorado, 215 UCB, Boulder, Colorado 80309, United States
| | - Theodore P. Snow
- Department
of Astrophysical and Planetary Sciences, University of Colorado, 391 UCB, Boulder, Colorado 80309, United States
- Center
for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, Colorado 80309, United States
| | - Veronica M. Bierbaum
- Department
of Chemistry and Biochemistry, University of Colorado, 215 UCB, Boulder, Colorado 80309, United States
- Center
for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, Colorado 80309, United States
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9
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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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10
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Dawley MM, Tanzer K, Cantrell WA, Plattner P, Brinkmann NR, Scheier P, Denifl S, Ptasińska S. Electron ionization of the nucleobases adenine and hypoxanthine near the threshold: a combined experimental and theoretical study. Phys Chem Chem Phys 2014; 16:25039-53. [DOI: 10.1039/c4cp03452j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Rodríguez Pirani LS, Erben MF, Geronés M, Romano RM, Cavasso Filho RL, Ma C, Ge M, Della Védova CO. Electronic properties of FC(O)SCH2CH3. a combined helium(I) photoelectron spectroscopy and synchrotron radiation study. J Phys Chem A 2014; 118:5950-60. [PMID: 25019560 DOI: 10.1021/jp412564u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The valence electronic properties of S-ethyl flouromethanethioate (S-ethyl fluoromethsanethioate), FC(O)SCH2CH3, were investigated by means of He(I) photoelectron spectroscopy in conjunction with the analysis of the photofragmentation products determined by PEPICO (phtoelectron-photoion-coincidence) by using synchrotron radiation in the 11.1-21.6 eV photon energy range. The first band observed at 10.28 eV in the HeI photoelectron spectrum can be assigned with confidence to the ionization process from the HOMO [nπ(S) orbital], which is described as a lone pair formally localized on the sulfur atom, in agreement with quantum chemical calculations using the outer valence Green function method [OVGF/6-311++G (d,p)]. One of the most important fragmentation channels also observed in the valence region corresponds to the decarbonylation process yielding the [M-CO](·+) ion, which is clearly observed at m/z = 80. Moreover, S 2p and S 2s absorption edges have been examined by measuring the total ion yield spectra in the 160-240 eV region using variable synchrotron radiation. The dynamic of ionic fragmentation following the Auger electronic decay has been evaluated with the help of the PEPIPICO (photoion-photoion-photoelectron-coincidence spectra) technique.
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Affiliation(s)
- Lucas S Rodríguez Pirani
- CEQUINOR (CONICET-UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , C. C. 962 (1900) La Plata, República Argentina
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12
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Schwell M, Hochlaf M. Photoionization Spectroscopy of Nucleobases and Analogues in the Gas Phase Using Synchrotron Radiation as Excitation Light Source. Top Curr Chem (Cham) 2014; 355:155-208. [DOI: 10.1007/128_2014_550] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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13
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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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14
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Schwell M, Bénilan Y, Fray N, Gazeau MC, Es-Sebbar E, Garcia GA, Nahon L, Champion N, Leach S. VUV photoionization of acetamide studied by electron/ion coincidence spectroscopy in the 8–24 eV photon energy range. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.11.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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15
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Lago A, Oliva J, Dávalos J. Experimental and theoretical investigation of the parabanic acid molecule following VUV excitation and photodissociation. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.11.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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16
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Chen L, Brédy R, Bernard J, Montagne G, Allouche AR, Martin S. Fragmentation of singly charged adenine induced by neutral fluorine beam impact at 3 keV. J Chem Phys 2011; 135:114309. [DOI: 10.1063/1.3621713] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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17
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Pirani LSR, Erben MF, Geronés M, Ma C, Ge M, Romano RM, Filho RLC, Della Védova CO. Outermost and inner-shell electronic properties of ClC(O)SCH2CH3 studied using HeI photoelectron spectroscopy and synchrotron radiation. J Phys Chem A 2011; 115:5307-18. [PMID: 21553925 DOI: 10.1021/jp112182x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A study of valence electronic properties of S-ethyl chlorothioformate (S-ethyl chloromethanethioate), ClC(O)SCH(2)CH(3), using HeI photoelectron spectra (PES) and synchrotron radiation is presented. Moreover, the photon impact excitation and dissociation dynamics of ClC(O)SCH(2)CH(3) excited at the S 2p and Cl 2p levels are elucidated by analyzing the total ion yield (TIY) spectra and time-of-flight mass spectra acquired in multicoincidence mode [photoelectron-photoion coincidence (PEPICO) and photoelectron-photoion-photoion coincidence (PEPIPICO)]. The HeI photoelectron spectrum is dominated by features associated with lone-pair electrons from the ClC(O)S- group, the HOMO at 9.84 eV being assigned to the n(π)(S) sulfur lone-pair orbital. Whereas the formation of C(2)H(5)(+) ion dominates the fragmentation in the valence energy region, the most abundant ion formed in both the S and Cl 2p energy ranges is C(2)H(3)(+). Comparison with related XC(O)SR (X = H, F, Cl and R = -CH(3), -C(2)H(5)) species reveals the impact of the alkyl chain on the photodissociation behavior of S-alkyl (halo)thioformates.
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Affiliation(s)
- Lucas S Rodríguez Pirani
- CEQUINOR (CONICET-UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 962 (1900) La Plata, República Argentina
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18
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Shin JW, Dong F, Grisham ME, Rocca JJ, Bernstein ER. Extreme ultraviolet photoionization of aldoses and ketoses. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.03.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Cortés E, Della Védova CO, Geronés M, Romano RM, Erben MF. Perchloromethyl Mercaptan, CCl3SCl, Excited with Synchrotron Radiation in the Proximity of the Sulfur and Chlorine 2p Edges: Dissociative Photoionization of Highly Halogenated Species. J Phys Chem A 2009; 113:9624-32. [DOI: 10.1021/jp904515u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emiliano Cortés
- CEQUINOR (UNLP - CONICET, CCT La Plata), Departamento
de Química, Facultad de Ciencias Exactas, Universidad Nacional
de La Plata, CC 962, La Plata (CP 1900), República Argentina,
and Laboratorio de Servicios a la Industria y al Sistema Científico
(LaSeISiC) (UNLP-CIC-CONICET), Camino Centenario e/505 y 508, (1903)
Gonnet, República Argentina
| | - Carlos O. Della Védova
- CEQUINOR (UNLP - CONICET, CCT La Plata), Departamento
de Química, Facultad de Ciencias Exactas, Universidad Nacional
de La Plata, CC 962, La Plata (CP 1900), República Argentina,
and Laboratorio de Servicios a la Industria y al Sistema Científico
(LaSeISiC) (UNLP-CIC-CONICET), Camino Centenario e/505 y 508, (1903)
Gonnet, República Argentina
| | - Mariana Geronés
- CEQUINOR (UNLP - CONICET, CCT La Plata), Departamento
de Química, Facultad de Ciencias Exactas, Universidad Nacional
de La Plata, CC 962, La Plata (CP 1900), República Argentina,
and Laboratorio de Servicios a la Industria y al Sistema Científico
(LaSeISiC) (UNLP-CIC-CONICET), Camino Centenario e/505 y 508, (1903)
Gonnet, República Argentina
| | - Rosana M. Romano
- CEQUINOR (UNLP - CONICET, CCT La Plata), Departamento
de Química, Facultad de Ciencias Exactas, Universidad Nacional
de La Plata, CC 962, La Plata (CP 1900), República Argentina,
and Laboratorio de Servicios a la Industria y al Sistema Científico
(LaSeISiC) (UNLP-CIC-CONICET), Camino Centenario e/505 y 508, (1903)
Gonnet, República Argentina
| | - Mauricio F. Erben
- CEQUINOR (UNLP - CONICET, CCT La Plata), Departamento
de Química, Facultad de Ciencias Exactas, Universidad Nacional
de La Plata, CC 962, La Plata (CP 1900), República Argentina,
and Laboratorio de Servicios a la Industria y al Sistema Científico
(LaSeISiC) (UNLP-CIC-CONICET), Camino Centenario e/505 y 508, (1903)
Gonnet, República Argentina
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Feyer V, Plekan O, Richter R, Coreno M, Prince KC. Photoion mass spectroscopy and valence photoionization of hypoxanthine, xanthine and caffeine. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2008.12.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
AbstractWe present experimental studies on the photoionization and photodissociation processes (photodestruction) of gaseous amino acids and nucleobases in interstellar and interpla-netary radiation analogs conditions. The measurements have been undertaken at the Brazilian Synchrotron Light Laboratory (LNLS), employing vacuum ultraviolet (VUV) and soft X-ray photons. The experimental set up basically consists of a time-of-flight mass spectrometer kept under high vacuum conditions. Mass spectra were obtained using a photoelectron photoion coincidence technique. We have shown that the amino acids are effectively more destroyed (up to 70–80%) by the stellar radiation than the nucleobases, mainly in the VUV. Since polycyclic aromatic hydrocarbons have the same survival capability and seem to be ubiquitous in the ISM, it is not unreasonable to predict that nucleobases could survive in the interstellar medium and/or in comets, even as a stable cation.
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