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1/Z Expansion Calculation Of The Bethe Logarithm For The Ground State Lamb Shift Of Two-Electron Ions, S. P. Goldman, Gordon W. F. Drake
1/Z Expansion Calculation Of The Bethe Logarithm For The Ground State Lamb Shift Of Two-Electron Ions, S. P. Goldman, Gordon W. F. Drake
Physics Publications
The leading two terms in the 1/Z expansion of the two-electron Bethe logarithm are calculated by the application of a new finite basis set method. The results can be expressed in the form ln epsilon (1s 2 1S)=ln(19.77(Z-0.0063) 2). The high-Z behaviour appears to differ from that of a previous variational calculation by Aashamar and Austvik (1976).
Lifetime Of The 2p State In He Ii, Gordon W. F. Drake, J. Patel, A. Van Wijngaarden
Lifetime Of The 2p State In He Ii, Gordon W. F. Drake, J. Patel, A. Van Wijngaarden
Physics Publications
When a beam of spin-polarized metastable He+(2s12) ions is quenched by an electric field E', the emitted radiation intensity contains an asymmetry term proportional to (kE)(P'k×E), where P' is the spin-polarization vector and k is the direction of observation. The resulting asymmetry is nearly proportional to the level width of the 2p12 state in He+. The measured asymmetry 0.007 602 70.000 020 3 corresponds to a lifetime 2p=(0.99920.0026)×10-10 sec, in fair agreement with the theoretical value 2p=0.9972×10-10 sec. © 1983 The American Physical Society.