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  • Palmer, Michael H.Univ Edinburgh, Sch Chem, Joseph Black Bldg,David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland. (author)

Combined theoretical and experimental study of the valence, Rydberg, and ionic states of chlorobenzene

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • AIP Publishing,2016
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:uu-295571
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295571URI
  • https://doi.org/10.1063/1.4944078DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • New photoelectron (PE) and ultra violet (UV) and vacuum UV (VUV) spectra have been obtained for chlorobenzene by synchrotron study with higher sensitivity and resolution than previous work and are subjected to detailed analysis. In addition, we report on the mass-resolved (2 + 1) resonance enhanced multiphoton ionization (REMPI) spectra of a jet-cooled sample. Both the VUV and REMPI spectra have enabled identification of a considerable number of Rydberg states for the first time. The use of ab initio calculations, which include both multi-reference multi-root doubles and singles configuration interaction (MRD-CI) and time dependent density functional theoretical (TDDFT) methods, has led to major advances in interpretation of the vibrational structure of the ionic and electronically excited states. Franck-Condon (FC) analyses of the PE spectra, including both hot and cold bands, indicate much more complex envelopes than previously thought. The sequence of ionic states can be best interpreted by our multi-configuration self-consistent field computations and also by comparison of the calculated vibrational structure of the B and C ionic states with experiment; these conclusions suggest that the leading sequence is the same as that of iodobenzene and bromobenzene, namely: (XB1)-B-2(3b(1)(-1)) < A(2)A(2)(1a(2)(-1)) < (BB2)-B-2(6b(2)(-1)) < (CB1)-B-2(2b(1)(-1)). The absorption onset near 4.6 eV has been investigated using MRD-CI and TDDFT calculations; the principal component of this band is B-1(2) and an interpretation based on the superposition of FC and Herzberg-Teller contributions has been performed. The other low-lying absorption band near 5.8 eV is dominated by a (1)A(1) state, but an underlying weak B-1(1) state (pi sigma*) is also found. The strongest band in the VUV spectrum near 6.7 eV is poorly resolved and is analyzed in terms of two pi pi* states of (1)A(1) (higher oscillator strength) and B-1(2) (lower oscillator strength) symmetries, respectively. The calculated vertical excitation energies of these two states are critically dependent upon the presence of Rydberg functions in the basis set, since both manifolds are strongly perturbed by the Rydberg states in this energy range. A number of equilibrium structures of the ionic and singlet excited states show that the molecular structure is less subject to variation than corresponding studies for iodobenzene and bromobenzene.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Ridley, TrevorUniv Edinburgh, Sch Chem, Joseph Black Bldg,David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland. (author)
  • Hoffmann, Soren VronningAarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark. (author)
  • Jones, Nykola C.Aarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark. (author)
  • Coreno, MarcelloCNR ISM, Basovizza Area Sci Pk, I-34149 Trieste, Italy. (author)
  • de Simone, MonicaCNR IOM Lab TASC, Trieste, Italy. (author)
  • Grazioli, CesareCNR IOM Lab TASC, Trieste, Italy.;Univ Trieste, Dept Chem & Pharmaceut Sci, Trieste, Italy. (author)
  • Zhang, TengUppsala universitet,Molekyl- och kondenserade materiens fysik,Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden.(Swepub:uu)tenzh645 (author)
  • Biczysko, MalgorzataShanghai Univ, Coll Sci, Int Ctr Quantum & Mol Struct, 99 Shangda Rd, Shanghai 200444, Peoples R China.;Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy. (author)
  • Baiardi, AlbertoScuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy. (author)
  • Peterson, Kirk A.Washington State Univ, Dept Chem, Pullman, WA 99164 USA. (author)
  • Univ Edinburgh, Sch Chem, Joseph Black Bldg,David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland.Aarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark. (creator_code:org_t)

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  • In:Journal of Chemical Physics: AIP Publishing144:120021-96061089-7690

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