Abstract
Fluorescence lifetime measurements of KrN clusters (N̄=2–2000) have been carried out using intense 10 eV laser excitation near 3P2 metastable atomic energy level. Two principal groups of electronically excited dimers Kr2* have been found in desorption: dimers, loosely bound near the (3P2+1S0) dissociation limit, ejected from cooled clusters and dimers undergoing vibrational relaxation from hot clusters. The desorption is principally terminated when N̄⩾50 at./cluster. The relaxation kinetics seems to converge to the properties of a solid state for 102⩽N̄⩽103 at./cluster. A variation of the Kr2*(1u/0u−) radiative lifetime, from 264 ns (in gas phase) to 440 ns (N̄=102), has been found. An equilibrium cluster temperature of 57 K has been calculated from this τ(N) dependence.
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