We explore the excitation profile of a repulsive impurity doped quantum dot. The dopant impurity potential chosen assumes Gaussian form. The quantum dot is subject to a randomly fluctuating confinement potential. The investigation reveals the interplay between the impurity strength, impurity location, and impurity domain to modulate the excitation rate. Owing to the interplay we encounter enhancement as well as depletion in the excitation rate as several impurity parameters are varied over a range. Phase space contours are often invoked to rationalize the findings. (C) 2011 Elsevier B.V. All rights reserved.