Abstract
The electric dipole matrix elements connecting the 1
s
2 1
S
and 1
snp
1
P
states of the helium isoelectronic sequence are calculated exactly to first order in inverse powers of the nuclear charge
Z
and the differences from the Hartree-Fock approximation are shown to correspond to virtual transitions of the 1
s
electrons. Comparison of the oscillator strengths predicted by a screening approximation with more accurate values reveals a regular variation in the error contained in the screening approximation, the correction of which allows the prediction of oscillator strengths and probabilities of 1
s
2 1
S
– 1
snp
1
P
transitions for all values of
n
and all values of
Z
within a probable error of 2% (table 5). Values of the photoionization cross-sections at the spectral heads are also presented.
Reference12 articles.
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2. 6 Proc. P hys;Bell K .;Soc.,1967
3. Proc. Roy;Cohen M.;Soc. A,1966
4. Dalgarno A. & Stew art A. L. i960 Proc. Roy. Soc. A 257 534.
5. Astron;Green L. C.;Un.,1965
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