Abstract
We demonstrate that analysis of the line shape of the acoustic-phonon wings of the ${I}_{1}$ bound-exciton emission in CdS can provide a means to determine crystal temperature $T$ and use this result to investigate the thermal relaxation of CdS following photoexcitation by an intense ${\mathrm{N}}_{2}$-laser pulse. We find $T\ensuremath{\sim}15$ \ifmmode^\circ\else\textdegree\fi{}K for \ensuremath{\sim}1-kW incident power and $T$ varies as the fourth root of the absorbed energy in accord with the Debye theory of specific heat. In addition the crystal-temperature rise is found to persist for long times (\ensuremath{\sim}1-100 \ensuremath{\mu}sec). From the variation of the crystal temperature with time, we deduce a constant value of heat flow from the sample to the liquid-helium bath (\ensuremath{\sim}4 ${\mathrm{W}/\mathrm{c}\mathrm{m}}^{2}$).
Published Version
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