Elektronisches Resonanz-Raman-Spektrum von Hexabromo-osmat(IV) |
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Authors: | H. Homborg |
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Abstract: | Electronic Resonance Raman Spectrum of Hexabromo Osmate(IV) Besides the vibrational bands there are other strong bands in the low-temperature Raman spectrum of [OsBr6]2?, which are independent from the excitation line and are interpreted as arising from transitions between the spin-orbit split components of the 3T1g–Os4+ ground state. The band at 2800 cm?1 is anomal polarized and attributable to Γ1(3T1g) → Γ4(3T1g), while the band at 4880 cm?1 is depolarized and therefore assigned to Γ1(3T1g) → Γ5(3T1g). In the electronic Raman spectrum, too, a rigorous resonance-Raman effect is displayed and as far as six overtones of the stretching vibration A1g and as many combination tones especially with T2g are observed. Because of the dynamic Jahn-Teller effect Γ1(3T1g) → Γ3(3T1g) cannot be detected as an electronic Raman transition. Γ1(3T1g) → Γ1(1T1g) at 15915 cm?1 is obtained by luminescence absorption. The results are in good agreement with the absorption spectrum. |
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