• Media type: E-Article
  • Title: Low symmetry splittings due to phase transitions in the vibronic spectrum of ReCl62− and ReBr62− doped in K2PtCl6-type crystals
  • Contributor: Wernicke, Rainer; Schmidtke, Hans-Herbert
  • Published: AIP Publishing, 1980
  • Published in: The Journal of Chemical Physics
  • Extent: 1938-1944
  • Language: English
  • DOI: 10.1063/1.439339
  • ISSN: 1089-7690; 0021-9606
  • Keywords: Physical and Theoretical Chemistry ; General Physics and Astronomy
  • Abstract: <jats:p>The vibronic structure of ReCl62− and ReBr62− doped in A2MX6 (A=Na, K; M=Pt, Sn, Te; X=Cl, Br) as obtained from phosphorescence spectra of microcrystals at 10 K has been investigated. Phase transitions of the host crystals to lower symmetry cause splittings of the Γ8(4A2g) electronic ground state into Kramers doublets, which are detected by splittings of the zero phonon transition and the vibronic side band. The crystal distortions also split the internal vibrational modes of the complex molecule, giving rise to a splitting pattern which is higher in symmetry than the corresponding site symmetry of the host lattice would predict. The assignment of phosphorescence bands to internal and lattice vibrations as well as to combinations and progressions is discussed.</jats:p>
  • Description: <jats:p>The vibronic structure of ReCl62− and ReBr62− doped in A2MX6 (A=Na, K; M=Pt, Sn, Te; X=Cl, Br) as obtained from phosphorescence spectra of microcrystals at 10 K has been investigated. Phase transitions of the host crystals to lower symmetry cause splittings of the Γ8(4A2g) electronic ground state into Kramers doublets, which are detected by splittings of the zero phonon transition and the vibronic side band. The crystal distortions also split the internal vibrational modes of the complex molecule, giving rise to a splitting pattern which is higher in symmetry than the corresponding site symmetry of the host lattice would predict. The assignment of phosphorescence bands to internal and lattice vibrations as well as to combinations and progressions is discussed.</jats:p>
  • Footnote: