【摘 要】
：
Expectation values of single electron and interelectronic geometric quantities such as,,,,andare calculated for doubly excited 2pnp 1Pe(3≤n≤5),2pnp3Pe(2≤n≤5)and 2pnd1,3D°(3≤n≤5)states of helium using Hylleraas-B-spline basis set.The energy levels converge
【机 构】
：
School of Physics and Technology,Wuhan University,Wuhan 430072,China;College of Physics and Electron
论文部分内容阅读
Expectation values of single electron and interelectronic geometric quantities such as,,,,andare calculated for doubly excited 2pnp 1Pe(3≤n≤5),2pnp3Pe(2≤n≤5)and 2pnd1,3D°(3≤n≤5)states of helium using Hylleraas-B-spline basis set.The energy levels converge to at least 10 significant digits in our calculations.The extrapolated values of geometric quantities except forreach 10 significant digits as well;reaches at least 7 significant digits using a multipole expansion approach.Our results provide a precise reference for future research.
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