  A theoretical investigation of the effects of spatial variation of confining
electric potential on photoionization cross section (PCS) in a spherical
quantum dot is presented. The potential profiles considered here are the
shifted parabolic potential and the inverse lateral shifted parabolic potential
compared with the well-studied parabolic potential. The primary findings are
that parabolic potential and the inverse lateral shifted parabolic potential
blue shift the peaks of the PCS while the shifted parabolic potential causes a
red shift.
