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Søren Vrønning Hoffmann

The electronic states of 1,2,3-triazole studied by vacuum ultraviolet photoabsorption and ultraviolet photoelectron spectroscopy, and a comparison with ab initio configuration interaction methods

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  • Michael H. Palmer, University of Edinburgh, United Kingdom
  • Søren Vrønning Hoffmann
  • Nykola C. Jones
  • Ashley R. Head, The University of Arizona, United States
  • Dennis L. Lichtenberger, The University of Arizona, United States
  • Institute for Storage Ring Facilities - Aarhus (ISA)
  • Department of Physics and Astronomy

The Rydberg states in the vacuum ultraviolet photoabsorption spectrum of 1,2,3-triazole have been measured and analyzed with the aid of comparison to the UV valence photoelectron ionizations and the results of ab initio configuration interaction (CI) calculations. Calculated electronic ionization and excitation energies for singlet, triplet valence, and Rydberg states were obtained using multireference multiroot CI procedures with an aug-cc-pVTZ [5s3p3d1f] basis set and a set of Rydberg [4s3p3d3f] functions. Adiabatic excitation energies obtained for several electronic states using coupled-cluster (singles, doubles, and triples) and complete active space self-consistent field procedures agree well with experimental values. Variations in bond lengths with the electronic state are discussed. The lowest energy UV band (∼5.5–6.5 eV) is assigned to three electronically excited states and demonstrates the occurrence of a nonplanar upper state on the low energy side. A UV photoelectron spectrum with an improved resolution yielded adiabatic and vertical ionization energies and reorganization energies for several of the lowest cationic states. As well as excitations to the s, p, d-Rydberg states are the excitations consistent with an f-series.

Original languageEnglish
JournalJournal of Chemical Physics
Pages (from-to)084309-1 to 084309-13
Number of pages13
Publication statusPublished - 2011

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