Abstract
Zeeman shifts were measured in the S 1 ← S o 0-0 transition of free-base porphin in a single crystal of n-octane by means of photochemical hole-burning at 4.2 K. On the application of a field parallel to the out-of-plane axis (z), holes burnt in zero-field shift with a quadratic field-dependence of −60.6 MHz/T 2. After allowing for a diamagnetic correction, a value of Λ = {|< S 1}| L z{|S2 > }|= 5.6 is obtained for the matrix element of the orbital angular momentum operator L z between the two lowest excited singlet states.
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