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 process of 4f
7
6s66p
8
P
J
state. The pulse width is fixed at (a) 2.5 μs and (b) 0.2 μs, respectively.