1
|
Wong NL, Howard J, Delaney B, Sokell E, Bolognesi P, Avaldi L. Coincidence measurements of photodouble ionization of benzene and thiophene. Phys Chem Chem Phys 2024; 26:10784-10795. [PMID: 38516916 DOI: 10.1039/d3cp05908a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Photodouble ionization (PDI) triple-differential cross sections (TDCSs) of benzene and thiophene have been measured in electron-electron coincidence experiments under 10-10 eV and 20-20 eV equal energy sharing conditions. A multi-Gaussian fit method has been employed to characterize the TDCSs. The trends and features observed for benzene and thiophene do highlight differences with helium most likely from molecular PDI contributions to the TDCS. A comparison with the well-known helium PDI TDCS for equal energy sharing conditions [Avaldi and Huetz J. Phys. B: At. Mol. Opt. Phys., 2005, 38, S861-S891] supported the validity of the multi-Gaussian fitting method and contextualized the benzene and thiophene fits. The molecular targets and energy sharing conditions were chosen to provide insight into the unexpected resonances observed in aromatic hydrocarbons but not aromatic heterocyclic molecules [Wehlitz et al., Phys. Rev. Lett., 2012, 109, 193001]. Contrary to the work of [Wehlitz et al., Phys. Rev. Lett., 2012, 109, 193001], no significant differences between benzene and thiophene were found.
Collapse
Affiliation(s)
- Nicholas L Wong
- School of Physics, Science Centre North, University College Dublin, Belfield Dublin 4, Ireland.
| | - Jason Howard
- School of Physics, Science Centre North, University College Dublin, Belfield Dublin 4, Ireland.
| | - Ben Delaney
- School of Physics, Science Centre North, University College Dublin, Belfield Dublin 4, Ireland.
| | - Emma Sokell
- School of Physics, Science Centre North, University College Dublin, Belfield Dublin 4, Ireland.
| | - Paola Bolognesi
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, 00015 Monterontondo Scalo, Italy
| | - Lorenzo Avaldi
- CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, 00015 Monterontondo Scalo, Italy
| |
Collapse
|
2
|
Zagorodskikh S, Vapa M, Vahtras O, Zhaunerchyk V, Mucke M, Eland JHD, Squibb RJ, Linusson P, Jänkälä K, Ågren H, Feifel R. An experimental and theoretical study of core-valence double ionisation of acetaldehyde (ethanal). Phys Chem Chem Phys 2016; 18:2535-47. [PMID: 26700657 DOI: 10.1039/c5cp05758b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core-valence double ionisation spectra of acetaldehyde (ethanal) are presented at photon energies above the carbon and oxygen 1s ionisation edges, measured by a versatile multi-electron coincidence spectroscopy technique. We use this molecule as a testbed for analyzing core-valence spectra by means of quantum chemical calculations of transition energies. These theoretical approaches range from two simple models, one based on orbital energies corrected by core valence interaction and one based on the equivalent core approximation, to a systematic series of quantum chemical electronic structure methods of increasing sophistication. The two simple models are found to provide a fast orbital interpretation of the spectra, in particular in the low energy parts, while the coverage of the full spectrum is best fulfilled by correlated models. CASPT2 is the most sophisticated model applied, but considering precision as well as computational costs, the single and double excitation configuration interaction model seems to provide the best option to analyze core-valence double hole spectra.
Collapse
Affiliation(s)
- S Zagorodskikh
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - M Vapa
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden and Centre for Molecular Materials Research, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
| | - O Vahtras
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - V Zhaunerchyk
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - M Mucke
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | - J H D Eland
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - R J Squibb
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - P Linusson
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
| | - K Jänkälä
- Department of Physics, University of Oulu, 90014 Oulu, Finland
| | - H Ågren
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - R Feifel
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| |
Collapse
|
3
|
Zagorodskikh S, Zhaunerchyk V, Mucke M, Eland J, Squibb R, Karlsson L, Linusson P, Feifel R. Single-photon double and triple ionization of acetaldehyde (ethanal) studied by multi-electron coincidence spectroscopy. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2015.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
4
|
Andersson E, Niskanen J, Hedin L, Eland JHD, Linusson P, Karlsson L, Rubensson JE, Carravetta V, Agren H, Feifel R. Core-valence double photoionization of the CS(2) molecule. J Chem Phys 2010; 133:094305. [PMID: 20831316 DOI: 10.1063/1.3469812] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Double photoionization spectra of the CS(2) molecule have been recorded using the TOF-PEPECO technique in combination with synchrotron radiation at the photon energies hν=220, 230, 240, 243, and 362.7 eV. The spectra were recorded in the S 2p and C 1s inner-shell ionization regions and reflect dicationic states formed out of one inner-shell vacancy and one vacancy in the valence region. MCSCF calculations were performed to model the energies of the dicationic states. The spectra associated with a S 2p vacancy are well structured and have been interpreted in some detail by comparison to conventional S 2p and valence photoelectron spectra. The lowest inner-shell-valence dicationic state is observed at the vertical double ionization energy 188.45 eV and is associated with a (2p(3/2))(-1)(2π(g))(-1) double vacancy. The spectrum connected to the C 1s vacancy shows a distinct line at 310.8 eV, accompanied by additional broad features at higher double ionization energies. This line is associated with a (C 1s)(-1)(2π(g))(-1) double vacancy.
Collapse
Affiliation(s)
- E Andersson
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Elshakre M, Storchi L, Kloda T, Linusson P, Heijkenskjöld F, Gengelbach A, Karlsson L, Hansson T, Tarantelli F, Feifel R. A photoelectron and double photoionization study of the valence electronic structure of 1,4-bromofluorobenzene. J Chem Phys 2009; 131:184302. [DOI: 10.1063/1.3257678] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|