Field ionization process of Eu 4f
7
6s
n
p Rydberg states
*
Zhang Jing
a),
b)
, Shen Li
a),
b)
, Dai Chang-Jian
a),
b)
The EFI thresholds versus n * for the Eu 4f
7
6s n p (
8
P
J
) Rydberg states.