Biexciton Decay in Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Exciton dynamics in Mn${\mathrm{F}}_{2}$ are investigated using time-resolved laser spectroscopy. At 1.7 K the decay of the intrinsic $E1$ exciton is nonexponential, independent of the particular traps present, and strongly dependent on pump intensity. We show that a biexciton decay model describes the qualitative behavior of the system and fits the decay data quantitatively over three decades. Values for the transfer rate to traps and the biexciton decay rate are also obtained.

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