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RESEARCH PRODUCT
Dynamics of spin state conversion processes in the solid state
Hartmut SpieringAndreas HauserPhilipp GütlichPeter AdlerAndreas Vefsubject
Arrhenius equationNuclear and High Energy PhysicsSpin statesChemistryThermodynamicsCondensed Matter PhysicsAtomic and Molecular Physics and Opticssymbols.namesakeReaction rate constantIntersystem crossingTransition metalComputational chemistrysymbolsPhysical and Theoretical ChemistrySpectroscopyQuantum tunnellingShape analysis (digital geometry)description
High spin (HS) ⇌ low spin (LS) conversions in transition metal complexes are nonradiative transitions between spin states. In this contribution, we present a study of the temperature and pressure dependence of the HS ⇌ LS intersystem crossing dynamics. For some iron(II) spin-crossover complexes, the rate constants were determined by line shape analysis of57Fe Mossbauer spectra. Their temperature dependence is described by an Arrhenius equation, their pressure dependence is interpreted within absolute rate theory. HS → LS conversion rates at low temperatures were determined from the relaxation of light-induced formation of HS states, monitored by optical spectroscopy. Deviations from a simple Arrhenius behaviour due to cooperative effects were found for one complex, low temperature tunnelling is observed for another.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1989-03-01 | Hyperfine Interactions |