Abstract
Optical hole-burning has been observed in the S 1 ← S 0 absorption of zinc porphin in n-octane by selective depletion of the ground state population and storage in the mestastable triplet state. In this way the homogeneous linewidths of S 1 ← S 0 for molecules in A and B sites of n-octane were measured between 1.6 and 4.5 K. Thermally induced dephasing was observed for B-site molecules with an activation energy of 14 cm −, equal to the separation between the two electronic components of S 1.
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