Abstract
Direct excitation with a pulsed laser into the O—O band of the T o ← S o absorption of a single crystal of 1,2.4,5-tetra-chlorobenzene creates a large excess population in the K ≈ O region of the triplet exciton band. This non-thermal distribution and subsequent evolution towards equilibrium is measured by spin-echo spectroscopy of one of the triplet exciton zero-field transitions.
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