Core-shell photoabsorption and photoelectron spectra of gas-phase pentacene: experiment and theory (Articolo in rivista)

Type
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  • Core-shell photoabsorption and photoelectron spectra of gas-phase pentacene: experiment and theory (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.1864852 (literal)
Alternative label
  • Michele Alagia1, Chiara Baldacchini2, Maria Grazia Betti3, Fabio Bussolotti4, Vincenzo Carravetta5, Ulf Ekström6, Carlo Mariani7, and Stefano Stranges8 (2005)
    Core-shell photoabsorption and photoelectron spectra of gas-phase pentacene: experiment and theory
    in The Journal of chemical physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Michele Alagia1, Chiara Baldacchini2, Maria Grazia Betti3, Fabio Bussolotti4, Vincenzo Carravetta5, Ulf Ekström6, Carlo Mariani7, and Stefano Stranges8 (literal)
Pagina inizio
  • 124305 (literal)
Pagina fine
  • 124310 (literal)
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  • http://dx.doi.org/10.1063/1.1864852 (literal)
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  • 122 (literal)
Rivista
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  • 6 (literal)
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  • 12 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1ISMN-CNR, Sez. Roma 1, Piazzale Aldo Moro 5, I-00185 Roma, Italy, and Laboratorio TASC-INFM, Area Science Park, I-34012 Basovizza (Trieste), Italy 2Dipartimento di Fisica, Istituto Nazionale per la Fisica della Materia, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, I-00185 Roma, Italy 3Dipartimento di Fisica, Istituto Nazionale per la Fisica della Materia, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, I-00185 Roma, Italy and SOFT-INFM, Dipartimento di Fisica, Piazzale Aldo Moro 2, I-00185 Roma, Italy 4Dipartimento di Fisica, Università di Modena e Reggio Emilia, Via G. Campi 213/A, I-41100 Modena, Italy and INFM National Center on nanoStructures and bioSystems at Surfaces (S3), Via G. Campi 213/A, I-41001 Modena, Italy 5IPCF-CNR, via Moruzzi 1, I-56124 Pisa, Italy 6Computational Physics, IFM, Linköping University, S-58183 Linköping, Sweden 7Dipartimento di Fisica, Istituto Nazionale per la Fisica della Materia, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, I-00185 Roma, Italy and INFM National Center on nanoStructures and bioSystems at Surfaces (S3), Via G. Campi 213/A, I-41001 Modena, Italy 8Dipartimento di Chimica, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, I-00185 Roma, Italy and Laboratorio TASC-INFM, Area Science Park, I-34012 Basovizza (Trieste), Italy (literal)
Titolo
  • Core-shell photoabsorption and photoelectron spectra of gas-phase pentacene: experiment and theory (literal)
Abstract
  • The C K-edge photoabsorption and 1s core-level photoemission spectra of pentacene (C22H14) molecules in the gas phase are experimentally determined, and calculated by Self Consistent Field (SCF) and Static-Exchange Approximation (STEX) ab-initio methods.The contribution of the six non-equivalent C atoms present in the molecule to the C 1s photoemission spectrum, is clearly brought to light. We observe and interpret the complex near-edge structures of the carbon K-edge absorption spectrum, with two main groups of discrete transitions between 283eV and 288eV photon energy, as due to absorption to pi* virtual orbitals, while the broader structures at higher energy involve sigma* virtual orbitals. The sharp absorption structures to the pi* empty orbitals lay well below the threshold for the C 1s ionization, demonstrating strong excitonic and localization effects. We can definitely explain the C K-edge absorption spectrum as due to both final (virtual) and initial (core) orbital effects, mainly involving excitations to the two lowest-unoccupied molecular orbitals of pi* symmetry, from the six chemically shifted core orbitals. These results constitute an important basis and prerequisite (literal)
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