The C=C Stretching Vibrations of κ-(BEDT-TTF)2Cu[N(CN)2]Br and Its Isotope Analogues

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  • Maksimuk Mikhail
    Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8585
  • Yakushi Kyuya
    Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8585
  • Taniguchi Hiromi
    Department of Applied Physics, The University of Tokyo Hongo, Tokyo 113-0033
  • Kanoda Kazushi
    Department of Applied Physics, The University of Tokyo Hongo, Tokyo 113-0033
  • Kawamoto Atsushi
    Department of Physics, University of Hokkaido, Sapporo, Hokkaido 060-0810

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タイトル別名
  • The C=C Stretching Vibrations of .KAPPA.-(BEDT-TTF)2Cu[N(CN)2]Br and Its Isotope Analogues.
  • C C Stretching Vibrations of カッパ BEDT TTF 2Cu N CN 2 Br and Its Isotope Analogues
  • The C=C Stretching Vibrations of κ-(BEDT–TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br and Its Isotope Analogues

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抄録

The C=C stretching modes in resonance Raman spectra and infrared reflectivity were measured at temperatures between 15 K and 300 K using various polarizations in κ-(BEDT-TTF)2Cu[N(CN)2]Br, its fully and partially deuterated analogues, and 13C-substituted analogue. The infrared- and Raman-active bands were re-assigned based on the factor group analysis. We found a Raman-active EMV-coupled ν3 mode near 1420 cm-1, which shows a large downshift and broadening through the inter-dimer EMV interaction. The mixing of the bridge and ring C=C stretching vibrations depend upon the symmetry of the crystal mode. In contrast to deuterated crystals, the non-deuterated crystals show a splitting in the ν2, ν3, and ν27 bands.

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