Procedure

You will be using the Moku:Lab multi-instrument as an oscilloscope. There is a menu within the scope app to open a function generator. The app runs on an iPad, and there can be some lag in collecting data, but the UI is easier to use than a traditional scope, and the built in RF generator is pretty swell, too.

The procedure for experiment 4B is on pages 4-8 and 4-9. Basically, you will:

1. Determine the residual magnetic field in the area of the experiment apparatus. The manual says that you should be able to do this using only the sweep coils. If you can’t, let your TA or technician know.
2. Turn on the RF signal from the Moku:Lab. You should now see the Zeeman resonances at higher/lower sweep coil currents.
3. Adjust the RF amplitude and comment on how that changes the resonances. Is there an optimal amplitude?
4. Adjust your sweep field parameters so that you can see the tip of the zero-field resonance and both Zeeman resonances (one for each isotope). Record the sweep coil current where the resonances occur.
5. Change the sweep coil current and record the new resonance locations. Take 2 or 3 measurements for each isotope. You’ll need this data to determine the factors and to calibrate the seep field using the known (not your measured) values.
6. Start using the ‘main field’ coils. These coils have many more windings than the sweep coil, and so they generate a much larger field. Use the sweep field and main field to measure resonance locations up to 1 MHz and calibrate the resonance shift/amp of the main coils. If you accounted for the sweep coils AND residual field properly, your data will lay in a straight line.