
April 25, 2014 11:1 PSP Book - 9in x 6in 06-Rashid-A.-Ganeev-c06
206 Characterization of Plasma Harmonics
atom eigenfunctions, then the energies of the states depend on the
field amplitude, and, as result, they vary in time.
To avoid the overcomplicated mathematical expressions for
definition of the CF, let us concentrate on the hydrogen atom. In the
subatomic region of the laser field strength, we restrict ourselves by
account of the two lowest discrete states, for which we have
1s
j
0
1s
=
16
4 + μ
2
(
t
)
2
,
2p
j
0
2p
=
1 − μ
2
(
t
)
1 + μ
2
(
t
)
4
.
(6.25)
In the subatomic region, μ
0
1, we can use the quadratic
approximation of the matrix elements (25), then for