of resonances extending into the ionization continuum. Unique characteristics in a photoionization spectrum are connected to the presence of a nonhydrogenic core, which produces the interference dips below threshold and attenuates the modulations above threshold. Although the known semiempirical approach of Harmin (cf. [4]) is quite effective, a fully adequate and consistent theory of this phenomenon has been lacking.Calculation of the characteristics of atom in a strong electric field remains a very important problem of modern quantum physics [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. As is well known, the external electric field shifts and broadens bound state atomic levels. The standard quantum mechanical approach relates complex eigenenergies (EE) E ϭ E r ϩ0.5iG and complex eigenfunctions (EF) to the shape resonances. The calculation difficulties in the standard quantum mechanical approach are well known. The WentzelKramers-Brillouin (WKB) approximation overcomes these difficulties for the states, lying far from "new continuum" boundary and, as rule, is applied in the case of a relatively weak electric field. The same is true with regard to the widespread asympCorrespondence to:

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