Abstract
Transient behavior of luminescence due to the transition 2Π u → 2Π g of S - 2 molecules in KI single crystals has been studied in the temperature range 2 ⋍ 77 K. The decay time and intensity of ordinary luminescence (OL) decrease when the temperature is increased. This behavior is interpreted in terms of a thermally activated nonradiative decay process. On the higher energy side of the 0-0 line of the OL weak emission is observed, besides resonant Raman scattering (RRS) due to the stretching mode of S - 2. This emission shows almost the same transient behavior as the exciting laser pulse. This fact shows that the emission is hot luminescence (HL), and that the vibrational relaxation time in the excited state 2 Π u is shorter than 50 ps.
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