Photoabsorption of H- and He via the Modified Atomic Orbital Theory: Application to the 1P° - Rydberg States

We report in this paper on the E-Nn energy resonances of the doubly excited P-1 degrees states of H- and He below the N = 4-10 threshold of H and He+, applying the modified orbital atomic theory in the framework of a semi-empirical procedure. The calculated energy levels are specified in terms of the supermultiplet classification scheme based on the new notations N(K, T)(n)(A) and N(nu)(n)(A) in the framework of the rovibrator model for the autoionizing states considered. Comparison of the N < r(12)(-1)> n radial expectation values of H- and He indicates that the angular quantum number K is effectively related to -< cos theta(12)>, with theta(12) being the angle between the position vectors of the two electrons. In addition, comparison of the radial expectation values of H- and He shows that, for both intrashell and intershell N(K, T)(n)(A), P-1 degrees states, it is the Coulomb force which causes the differences observed in the photoabsorption spectra of H- and He. All the results presented in this work compared well with the available literature values.