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Scognamiglio A, Thalmann KS, Hartweg S, Rendler N, Bruder L, Coto PB, Thoss M, Stienkemeier F. Non-adiabatic electronic relaxation of tetracene from its brightest singlet excited state. J Chem Phys 2024; 161:024302. [PMID: 38973758 DOI: 10.1063/5.0214006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 06/16/2024] [Indexed: 07/09/2024] Open
Abstract
The ultrafast relaxation dynamics of tetracene following UV excitation to the bright singlet state S6 has been studied with time-resolved photoelectron spectroscopy. With the help of high-level ab initio multireference perturbation theory calculations, we assign photoelectron signals to intermediate dark electronic states S3, S4, and S5 as well as to a low-lying electronic state S2. The energetic structure of these dark states has not been determined experimentally previously. The time-dependent photoelectron yields assigned to the states S6, S5, and S4 have been analyzed and reveal the depopulation of S6 within 60 fs, while S5 and S4 are populated with delays of about 50 and 80 fs. The dynamics of the lower-lying states S3 and S2 seem to agree with a delayed population coinciding with the depopulation of the higher-lying states S4-S6 but could not be elucidated in full detail due to the low signal levels of the corresponding two-photon ionization probe processes.
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Affiliation(s)
- A Scognamiglio
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - K S Thalmann
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - S Hartweg
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - N Rendler
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - L Bruder
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - P B Coto
- Materials Physics Center (CFM), CSIC and Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
| | - M Thoss
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
| | - F Stienkemeier
- University of Freiburg, Institute of Physics, Hermann-Herder-Str. 3, Freiburg, Germany
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Stefanou M, Chandler HJ, Mignolet B, Williams E, Nanoh SA, Thompson JOF, Remacle F, Schaub R, Campbell EEB. Angle-resolved photoelectron spectroscopy and scanning tunnelling spectroscopy studies of the endohedral fullerene Li@C 60. NANOSCALE 2019; 11:2668-2678. [PMID: 30357213 DOI: 10.1039/c8nr07088a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Gas phase photoelectron spectroscopy (Rydberg Fingerprint Spectroscopy), TDDFT calculations and low temperature STM studies are combined to provide detailed information on the properties of the diffuse, low-lying Rydberg-like SAMO states of isolated Li@C60 endohedral fullerenes. The presence of the encapsulated Li is shown by the calculations to produce a significant distortion of the lowest-lying S- and P-SAMOs that is dependent on the position of the Li inside the fullerene cage. Under the high temperature conditions of the gas phase experiments, the Li is mobile and able to access different positions within the cage. This is accounted for in the comparison with theory that shows a very good agreement of the photoelectron angular distributions, allowing the symmetry of the observed SAMO states to be identified. When adsorbed on a metal substrate at low temperature, a strong interaction between the low-lying SAMOs and the metal substrate moves these states to energies much closer to the Fermi energy compared to the situation for empty C60 while the Li remains frozen in an off-centre position.
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Affiliation(s)
- M Stefanou
- EaStCHEM and School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
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Bohl E, Sokół KP, Mignolet B, Thompson JOF, Johansson JO, Remacle F, Campbell EEB. Relative Photoionization Cross Sections of Super-Atom Molecular Orbitals (SAMOs) in C60. J Phys Chem A 2015; 119:11504-8. [DOI: 10.1021/acs.jpca.5b10339] [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)
- Elvira Bohl
- EaStCHEM, School
of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Katarzyna P. Sokół
- EaStCHEM, School
of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Benoit Mignolet
- Department of Chemistry, B6c, University of Liège, B4000, Liège, Belgium
| | | | - J. Olof Johansson
- EaStCHEM, School
of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, U.K
| | - Francoise Remacle
- Department of Chemistry, B6c, University of Liège, B4000, Liège, Belgium
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