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Details van artikel 13 van 28 gevonden artikelen
| Titel: |
Magnetic circular and linear dichroism of cubic or tetragonally distorted high spin d5 systems |
| Auteur: |
Rivoal, J. C. Briat, B. Vala, M. |
| Verschenen in: |
Molecular physics |
| Paginering: | Jaargang 38 (1979) nr. 6 pagina's 1829-1854 |
| Jaar: |
1979-12 |
| Inhoud: |
The low temperature, single crystal and polymer matrix absorption, magnetic circular dichroism (MCD) and magnetic linear dichroism (MLD) of the d-d electronic transitions in the tetrahalomanganates (II), [(C2H5)4N]2MnX4 (where X = Cl, Br and I), have been investigated. The effect of crystal rotation about the incident radiation propagation direction is theoretically examined and shown to yield anisotropic MLD terms for 4T1 and 4E states and isotropic ones for 4A2 and 4T2 states. The combination of the sign of the MCD zeroth order moment and the MLD crystal rotational dependence is used to assign the observed bands with a high degree of certainty. It is shown that although conventional crystal field theory correctly predicts the d-d state ordering in the lowest energy range (4T1 < 4T2 < 4E) it fails badly in the higher energy region (4T1 < 4T2 < 4A2). An improved model including both charge-transfer and d electron configurations is proposed to explain the discrepancy. Spin-orbit and tetragonal field calculations are shown to play a very effective role in explaining fine details in our experimental spectra. Finally, evidence for Jahn-Teller activity in several bands is noted. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 13 van 28 gevonden artikelen
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