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- W2020397714 abstract "The value of the Sommerfeld screening parameter sigma 1 for the K level has been calculated for Z=1-103 assuming that the inner screening parameter sigma 2=0 for this level. The method used for the calculations is believed to be superior to the original Sommerfeld method since the two-body relativistic energy expression has been used in closed form, thus avoiding series truncation errors which can be important for large Z. It is found that: (i) sigma 1 increases with Z contrary to Blokhin's observation (1957) that it has a value of 0.3 independent of Z; (ii) Delta sigma 1(Z)= sigma 1(Z)- sigma 1(Z-1) when plotted as function of Z rapidly diminishes in the region of low Z and then stabilises around 0.05 for medium Z; (iii) the curve of Delta sigma 1 against Z shows clear evidence of filling and closure of the d and f shells; (iv) for the first transition series, Delta sigma 1 shows an interesting variation consisting of a gradual decrease till the 3d shell is half filled, followed by a gradual increase till the shell is completely filled. Possible reasons for these observations have been discussed." @default.
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- W2020397714 date "1979-06-14" @default.
- W2020397714 modified "2023-09-24" @default.
- W2020397714 title "Sommerfeld screening parameters for the K level in X-ray spectra" @default.
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- W2020397714 doi "https://doi.org/10.1088/0022-3700/12/11/005" @default.
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