Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence
Abstract
The wavelengths of the transition 1s2p /sup 1/P/sub 1/ ..-->.. 1s/sup 2/ /sup 1/S/sub 0/ in heliumlike potassium, scandium, titanium, vanadium, chromium, and iron have been measured with an experimental precision of ..delta..lambda/lambda approx. 1/20,000. The data typically agree within error bars with recent theoretical predictions which include quantum electrodynamical corrections. However, the comparison shows that there are systematic differences between data and predictions, which indicate a need to include additional corrections in the calculations. In particular, it is found that the experimental wavelengths are consistently shorter than the calculated values by amounts which depend on the particular theoretical prediction used in the comparison. Measurements of the wavelengths of ..delta..n greater than or equal to 2 x-ray transitions in heliumlike argon, scandium, titanium, vanadium, chromium, and iron are also presented. 42 refs., 8 figs., 2 tabs.
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