Thus, one component of the D-line is split into six Zeeman
components, and the other into foul-.
In the given case, the Zeeman eject remains anomalousas
long as ) is negligibly small compared with one thousandth of
a volt, or the magnetic field is very much less than 5,000 CGSE
units.
A diagram of the splitting is shown in Fig. 45.
The atom in an electric held (Stark effect). The multiplet levels
for a certain total angular momentum J split in an electric field,
too. We shall consider first of all the case of a weak field, when
the level shift caused by the
Image
field is small compared with
natural multiplet splitting.
First of all, we must bear in
mind that the angular-momentum
projection on the electric field
is determined only within the
accuracy of the sign, because
the angular momentum is a pseu-
dovector while the electric field
is a real vector. In reversing
all the coordinate signs, the
angular-momentum components
change sign whale the electric-
field components do not change
sign. But since the choice of
right-handed or left-handed cc-
ordinate system is arbitrary, the
