  Island size and capture zone distributions (ISDs, CZDs) are studied
numerically in submonolayer growth with various critical island sizes and
shapes. CZDs scaled by the variance show excellent agreement with the Wigner
surmise, confirming the Pimpinelli-Einstein approach for large CZs / large
island dynamics. The ISD decay as exp(-s^x), with x=4, x approx 2.4 and 2 for
point, fractal, and square islands, respectively. A scaling approach explains
the values of x from the Gaussian decay of CZD and the efficiency of islands to
capture diffusing adatoms.
