Abstract
A theoretical analysis is made of the hyperfine structure of the twelve levels of Eu I 4
f
7
(
8
S
) 6
s
6
p
using intermediate-coupled eigenfunctions obtained from a least-squares fit of the energies of the levels. Relativistic effects for the 6
p
electron are calculated throughout by tensor-operator techniques. Good agreement is obtained with the observed
A
values, treating as parameters the polarization of the core (by the
f
electrons) and the hyperfine interaction constant of the 6
s
electron. The magnitude of the core polarization is related to data on Eu I 4
f
7
(
8
S
) 6s
2
, Euii 4
f
7
(
8
s
) 6
s
, and Eu III 4
f
7
(
8
S
). The hyperfine-structure anomalies also fall into a consistent pattern. The observed
B
values are related to quadrupole moments of
151
Eu and
153
Eu.
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