  Using a microscopic transport model together with a coalescence after-burner,
we study the formation of deuterons in Au + Au central collisions at
$\sqrt{s}=200 AGeV$. It is found that the deuteron transverse momentum
distributions are strongly affected by the nucleon space-momentum correlations,
at the moment of freeze-out, which are mostly determined by the number of
rescatterings. This feature is useful for studying collision dynamics at
ultrarelativistic energies.
