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Bulletin of the American Physical Society

Tune-out wavelength for the $\mathbf{1s2s\;^3S - 1s3p\;^3P}$ transition of helium: relativistic effects

G. W. F. Drake, Jacob Manalo

Published Jun 6, 2017• 0 citations
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Tune-out wavelength for the 1s2s  3S−1s3p  3P\mathbf{1s2s\;^3S - 1s3p\;^3P}1s2s3S−1s3p3P transition of helium: relativistic effects
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Hyperfine Suppression of a 2  32\;^323S1_11​ -- 3  33\;^333P1_11​ Radiative Transition in Helium
The six longest tune-out wavelengths for the He(1s2s3S1e1s2s{\phantom{\rule{4pt}{0ex}}}^{3}{S}_{1}^{e}1s2s3S1e​) metastable state are determined by explicit calculation. The tune-out wavelength at 413.02 nm is expected to be sensitive to finite mass, relativistic, and quantum electrodynamic effects upon the transition matrix elements and its measurement would provide a nonenergy test of fundamental atomic structure theory.
A series of magic wavelengths for the forbidden transition of $2{\phantom{\rule{0.16em}{0ex}}}^{3}{S}_{1}\ensuremath{\rightarrow}2{\phantom{\rule{0.16em}{0ex}}}^{1}{P}_{1}$ in helium are determined by performing large-scale full relativistic configuration interaction calculations based on Dirac-Coulomb-Breit Hamiltonian with the mass shift operator included. QED corrections to magic wavelengths are taken into account by using the perturbation theory in nonrelativistic configuration interaction calculations. The 1335.55(2)-nm magic wavelength for the $2{\phantom{\rule{0.16em}{0ex}}}^{3}{S}_{1}(M=\ifmmode\pm\else\textpm\fi{}1)\ensuremath{\rightarrow}2{\phantom{\rule{0.16em}{0ex}}}^{1}{P}_{1}(M=0)$ transition is found to be sensitive to the finite nuclear mass, relativistic, and QED effects, and its measurement might provide a test of atomic structure theory.