c
r
y
s
t
a
l
f
i
e
l
d
s
p
l
i
t
t
i
n
g
Δ
-
1
c
m
2
0
0
0
0
n
u
m
b
e
r
o
f
d
e
l
e
c
t
r
o
n
s
1