Zeeman Effect Experiment ... or, Setup the Experiment in the PASCO Cap-
19
012-14266B
7. Center the pattern horizontally approximately by moving the camera. To do this, hold the camera, loosen the upper screw
on the adjustable post holder, and rotate the camera left or right. Tighten the upper screw. Then use the black X - Y adjust-
ment knobs on the interferometer assembly to adjust the vertical position and fine tune the horizontal position.
8. If the pattern is not uniformly illuminated (as in Figure 17, use the
knob on the horizontal adjustable holder of the polarizer/lens assem-
bly to adjust the horizontal position of the polarizer/lens assembly.
9. Increase the power supply current to 3.0 A.
•
With the electromagnet on at 3.0 A, the rings should split into trip-
lets as shown in Figure 18. The rings should be sharply defined all
the way around.
•
If the pattern is like Figure 19, the two plates of the interferome-
ter are not sufficiently parallel. The plates are adjusted using the
three silver knobs on the interferometer. You may also need to
adjust the camera aperture and focus.
•
NOTE: This adjustment is a challenge. It is a good idea to put a
pencil mark on each of the silver knobs to mark the initial vertical
position and keep track of how far you have turned them clock-
wise or counterclockwise. That way you can always start over.
•
CAUTION: If you go too far the knob will pop off.
•
NOTE: This adjustment is critical for obtaining good results!
10. After completing the adjustments, reduce the power supply out-
put to 0.00 A.
Figure 17: B = 0 Pattern
Figure 18: Well Aligned Pattern
Rings split
into triplets
Figure 19: Poorly Aligned Pattern