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• W2966587058 abstract "Abstract Evaluation of energy eigenvalues of first 19 metastable bound doubly excited states (DESs) arising from even parity F states of He atom are done within the framework of the Ritz variational principle. The wavefunction of the given state is constructed from different combinations of pf and dd configurations. The radial parts of the wavefunctions for both the configurations are expanded in Hylleraas type basis set. The nonlinear parameters of the Slater‐type orbitals representing both the electrons are taken in geometrical sequence that span the radial space properly. The present calculated energies for the metastable bound states are lowest yet obtained. The resonance parameters that is, energy position and width of a large number of resonance states lying above He + (2 p ) threshold are evaluated by using stabilization method. The resonance parameters calculated in this work are in good agreement with the available theoretical results for the resonance states lying below He + (3 p ) threshold. The parameters for a large number of resonance states lying between He + (3 p ) and He + (7 p ) thresholds are being reported for the first time. The effective quantum numbers of all the states considered in the present work are estimated by using quantum defect theory. Different structural properties for example, the one‐ and two‐particle moments, virial factors, expectation values of interelectronic angles, two‐particle radial probability densities, and so forth are estimated for both metastable‐bound as well as resonance states. The present results can be used as a benchmark for future references. PACS 31.15.ac , 31.15.V‐, 31.15.xt, 32.80.Zb, 32.80.Ee" @default.
• W2966587058 created "2019-08-13" @default.
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• W2966587058 date "2019-06-04" @default.
• W2966587058 modified "2023-10-18" @default.
• W2966587058 title "Extensive investigations for metastable‐bound and resonance ³ <i>F</i> ^<i>e</i> states of He atom" @default.
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• W2966587058 doi "https://doi.org/10.1002/qua.25981" @default.
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