  The influence of the tip-substrate bias induced electrical field in a
scanning tunneling spectroscopy experiment on colloidal InAs nanocrystals has
been studied. Calculating the Stark induced splitting of the degenerate 1P_e
state perturbatively within a particle-in-a-sphere model, revealed a possible
explanation of recently published experimental wave function mapping data by
Millo et al. (Ref. 1).
