â‹„
â‹„
â‹„
â‹„
â‹„
x
3
.
6
×
10
6
x
1
.
0
µW
/cm
2
1
.
0
cm
2
hν
ν
0
=
1
.
1
×
10
15
H
z
φ
λ
=
250
nm
λ
=
0
.
200
nm
45
.
0
o
