Cr3+−Cr3+ excited state Raman scattering from molecular vibrations in binuclear Cs3Cr2Cl9 induced by exchange striction |
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Authors: | IW Johnstone B Briat DJ Lockwood |
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Institution: | 1. >Physics Division, National Research Council, Ottawa, Canada K1A OR6;1. Laboratoire d''Optique Physique, ER5 du CNRS, E.P.C.I., 10 rue Vauquelin, 75231 Paris Cedex 05 , France |
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Abstract: | On increasing the temperature, several new bands appear at higher energy from their parent vibrational modes in the Raman spectrum of the molecular complex Cr2Cl3?9. The parent and new bands have intensities that follow the thermal population factors of various 4A2g4A2g Cr3+ pair states. This behaviour is attributed to exchange striction which produces a change in vibrational energy with excited state for those normal modes with large net axial Cr3+?Cr3+ displacements. |
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