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Zeeman Effect Experiment
CMOS Camera and Lens
15
012-14266B
the electromagnet. If the switch opens, it will be necessary to wait for it to reset by itself before proceed-
ing.
3. Turn on the power supply and adjust the current to 0.00 A. Allow the mercury lamp to warm up for a few minutes until it
reaches full brightness.
Check the Alignment
NOTE: Because the filter blocks all but the 546.1 nm spectral line,
there is no ultraviolet light that passes through the interferome-
ter/filter assembly. Therefore, it is safe to look through the inter-
ferometer at the mercury lamp while it is on.
1. Look through the interferometer at the mercury lamp. You should see a
green “bulls-eye” that is centered in the interferometer circle (see Figure
12).
2. If the image is not centered, use the knob on the horizontal adjustable
holder of the lens assembly to move the assembly left or right, or use the
silver adjuster ring to adjust the vertical height of the interferometer to
move it up or down.
•
NOTE: The background of the “bulls-eye” interference pattern viewed
through the interferometer may not be black due to scattered light. The
best solution to this problem is to dim the room lights
CMOS Camera and Lens
1. Carefully screw the 50 mm (millimeter) camera lens to the front of the
CMOS camera (see Figure 13). Thread the remaining post into the bottom
of the camera. Mount the post in the remaining adjustable post holder.
Screw the adjustable post holder onto the third optical carrier.
2. Mount the camera/lens assembly on the track. Position the optical carrier
at the end of the track so that the white indicator mark on the carrier is near
the 57 cm on the track.
3. Adjust the camera/lens so that it is parallel to the track and the center of the
camera lens is at the same height as the other two assemblies.
•
NOTE: If the background of the “bulls-eye” interference pattern viewed
through the interferometer is not black due to scattered light, the camera can be moved closer to the interferometer. How-
ever, this may cause the illumination of the pattern viewed through the camera to be non-uniform. A better solution is to
dim the room lights and keep the camera optical carrier at the 57 cm mark.
Experiment Procedure
Use the Included PASCO Capstone Workbook File or the Microsoft Word File...
NOTE: The SE-9654 Zeeman Effect Experiment includes the ZEEMAN EFFECT Flash Drive that contains three folders: Zee-
man Capstone Files, Zeeman Graphics, and Zeeman Word Files. One of the Zeeman Capstone files (Zeeman Effect.cap) is
already configured for use in the Zeeman Effect experiment. The setup of the software has been done. Follow the instructions
on each page of the Capstone workbook in order to record, measure, and analyze the data.
Figure 11: “Bulls-eye” Image
Camera
Camera Lens
Focus
Ring
Aperture
Ring
Figure 12: Camera/Lens Assembly