  In the effective mass approximation for electronic (hole) states of a
spheroidal quantum dot with and without external fields the perturbation theory
schemes are constructed in the framework of the Kantorovich and adiabatic
methods. The eigenvalues and eigenfunctions of the problem, obtained in both
analytical and numerical forms, were applied for the analysis of spectral and
optical characteristics of spheroidal quantum dots in homogeneous electric
fields.
