Singlet-Triplet Mixing in the Helium Sequence

Details Singlet-Triplet Mixing in the Helium Sequence Singlet-Triplet Mixing in the Helium Sequence

May 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969phrv..181...23d&link_type=abstract

Physical Review, vol. 181, Issue 1, pp. 23-24

Physics

10

Scientific paper

Accurate variational calculations are presented for the off-diagonal matrix elements of the Breit interaction between the 21P and 23P states of several members of the helium iso-electronic sequence. A comparison is made with recent Z-expansion calculations, which are accurate through terms of order α2Z3. The comparison shows that the Z-expansion method for off-diagonal mixing is potentially useful in the theory of many-electron atoms. The effect of singlet-triplet mixing on the 23P excitation cross sections is briefly discussed.

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