Abstract
The phosphorescence spectrum of the metastable 4 Eu state of copper porphin in single crystals of n-octane (C8) and n-decane (C10) has been studied between 2·3 and 35 K, with and without a magnetic field B. The crystal field splitting between the orbital components observed at 35 K is δ = 30·3 ± 0·3 (C8), 13·8 ± 0·2 cm-1 (C10). From the Zeeman shifts we derive the effective orbital angular momentum Λ′ = 0·8 ± 0·2 (C10), the spin-orbit coupling parameter |Z′| = 1·5 ± 1·0 cm-1 (C10), the spin-spin dipolar interaction parameters D = -0·1 ± 0·2 cm-1 (C8, C10) and |E| = 0·31 ± 0·03 cm-1 (C8, C10), and the g-factors g ∥ = 2·14 ± 0·04 (C8, C10) and g ⊥ = 2·00 ± 0·03 (C8, C10).