Precise determination of the 2s(1/2)-2p(1/2) splitting in very heavy lithiumlike ions utilizing dielectronic recombination.
The 2s(1/2)-2p(1/2) energy splittings DeltaE(L) of the lithiumlike ions 19779Au76+, 20882Pb79+, and 23892U89+ have been measured at the Experimental Storage Ring, utilizing low energy dielectronic recombination. The resonance energies in total 41 different 1s(2) 2p(1/2)nl(j(')) (n > or =20) autoionizing Rydberg states populated in the dielectronic capture process have been determined. The 2s(1/2)-->2p(1/2) excitation energies have been obtained by extrapolation of these resonance energies to the associated series limits n--> infinity. The combined analysis of the experimental data for all three ions yields DeltaE(L)=216.134(96) eV for Au76+, 230.650(81) eV for Pb79+, and 280.516(99) eV for U89+.
Brandau
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C
Institut für Kernphysik, Justus-Liebig-Universität, D-35392 Giessen, Germany.
Kozhuharov
C
C
Müller
A
A
Shi
W
W
Schippers
S
S
Bartsch
T
T
Böhm
S
S
Böhme
C
C
Hoffknecht
A
A
Knopp
H
H
Grün
N
N
Scheid
W
W
Steih
T
T
Bosch
F
F
Franzke
B
B
Mokler
P H
PH
Nolden
F
F
Steck
M
M
Stöhlker
T
T
Stachura
Z
Z