Screened radiative corrections from hyperfine-split dielectronic resonances in lithiumlike scandium.
Term energies for dielectronic-recombination Rydberg resonances below 0.07 eV are determined for Sc18+ with absolute accuracies below 0.0002 eV by electron collision spectroscopy in an ion storage ring, using the twin-electron-beam technique and a cryogenic photocathode. The lithiumlike 2s_{1/2}-2p_{3/2} transition energy for Z=21 is determined to 4.6 ppm, less than 1% of the few-body effects on radiative corrections. Features from the hyperfine structure of the 2s state could be resolved in the dielectronic-recombination spectrum.
Lestinsky
M
M
Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
Lindroth
E
E
Orlov
D A
DA
Schmidt
E W
EW
Schippers
S
S
Böhm
S
S
Brandau
C
C
Sprenger
F
F
Terekhov
A S
AS
Müller
A
A
Wolf
A
A