Arrangement of nitrogen atoms in GaAsN alloys determined by scanning tunneling microscopy

The pair distribution function of nitrogen atoms in GaAs0.983N0.017 has bee n determined by scanning tunneling microscopy. Nitrogen atoms in the first and third planes relative to the cleaved (1 (1) over bar0) surface are imag ed. A modest enhancement in the number of nearest-neighbor pairs particular ly with [001] orientation is found, although at larger separations the dist ribution of N pair separations is found to be random. (C) 2001 American Ins titute of Physics.