Djh. Howie et al., MEASUREMENT OF 1S2S S-3(1)-1S2P P-3(2,0) WAVELENGTHS IN HELIUM-LIKE, Journal of physics. B, Atomic molecular and optical physics, 29(5), 1996, pp. 927-936
We have used photographic spectroscopy of a beam-foil source to measur
e the vacuum ultraviolet 1s2s S-3(1)-1s2p P-3(2,0) transition waveleng
ths in helium-like sulphur. The results are 673.41 +/- 0.02 Angstrom a
nd 756.35 +/- 0.04 Angstrom, respectively. These measurements, togethe
r with our earlier measurements in helium-like silicon and phosphorus,
are compared with other precision measurements for Z = 14 to 18, and
with recent relativistic and quantum electrodynamic calculations.