We investigate the Schrodinger operator H = -Delta + V acting in L-2(R-n),
n greater than or equal to 2, for potentials V that satisfy partial derivat
ive(x)(alpha) V(x) = O(\x\(-\alpha\)) as \x\ --> infinity. By introducing c
oordinates on R-n closely related to a relevant eikonal equation we obtain
an eigenfunction expansion for H at high energies. (C) 1999 Academic Press.