caa a22 4500 465818889 CHVBK 20180323112130.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF01112866 doi (NATIONALLICENCE)springer-10.1007/BF01112866 Charge and radial correlations in helium and helium-like atoms [Elektronische Daten] [Toshikatsu Koga, Shôji Aoki] Summary: For two-electron atoms, the method of a variable exponent, which treats the orbital exponent (or effective nuclear charge) of an electron as an explicit function of the radial coordinate of the other electron, is studied. The method is shown to improve the energy and other electronic properties remarkably. An incorporation of the variable exponent into the Kellner approximation for He, for example, gives the energy −2.872 606 1 a.u., which is lower than the original Kellner energy by 0.024 949 8 a.u. and exceeds the Hartree-Fock limit energy by 0.010 926 1 a.u. The improvement due to the variable exponent originates from the inclusion of the charge and radial correlations. Applications of the method to the Eckart and Hylleraas approximations are also presented. Springer-Verlag, 1990 Variable exponent nationallicence Electron correlation nationallicence Helium and helium-like atoms nationallicence Koga Toshikatsu Department of Applied Chemistry and Department of Applied Science for Energy, Muroran Institute of Technology, 050, Muroran, Hokkaido, Japan aut Aoki Shôji Department of Applied Chemistry and Department of Applied Science for Energy, Muroran Institute of Technology, 050, Muroran, Hokkaido, Japan aut Theoretica chimica acta Springer-Verlag 78/3(1990-05-01), 165-173 0040-5744 78:3<165 1990 78 214 https://doi.org/10.1007/BF01112866 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01112866 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Koga Toshikatsu Department of Applied Chemistry and Department of Applied Science for Energy, Muroran Institute of Technology, 050, Muroran, Hokkaido, Japan aut NATIONALLICENCE 700 1- Aoki Shôji Department of Applied Chemistry and Department of Applied Science for Energy, Muroran Institute of Technology, 050, Muroran, Hokkaido, Japan aut NATIONALLICENCE 773 0- Theoretica chimica acta Springer-Verlag 78/3(1990-05-01), 165-173 0040-5744 78:3<165 1990 78 214 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer