Journal of Physical Studies 7(3), 283–287 (2003) DOI: https://doi.org/10.30970/jps.07.283 STARK EFFECT AND RESONANCES IN THE IONIZATION CONTINUUM FOR HYDROGEN ATOM AND WANNIER–MOTT EXCITONS IN A DC ELECTRIC FIELD О. V. Glushkov1, S. V. Ambrosov2, P. O. Fedchuk3, O. P. Fedchuk1 1I. I. Mechnikov Odesa National University, a/c 116, Odesa–9, 65009, Ukraine 2Odesa State Ecological University, Odesa, 65009, Ukraine 3Odesa State Academy of Refrigeration, Odesa, 65026, Ukraine

A numerical calculation of the DC Stark effect for hydrogen atom and Wannier-Mott excitons in an external uniform DC electric field is carried out within the operator perturbation theory method. New adequate model for description of the unique especialitites in the photoionization spectra of the hydrogenic atoms is proposed. The positions of the high-excited resonances calculated in the ionization continuum are in a good agreement with known experiment of Glab {\em et al}. It is found that the Stark shift for the $n=2$ state of excitons in the Cu$_2$O semiconductor (yellow series) at the electric field strength 600 V/cm results in $-3.1\times 10^{-4}$ eV which agrees well with experimental data of Gross {\em et al}. It is indicated also that the analogous unique especialitites may possibly take a place in the Wannier-Mott excitons spectra near the threshold boundary.

PACS number(s): 42.50.$-$p, 72.20.Jv, 72.40

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