NMR Pre Lab and Evaluation

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NMR Pre Lab and Evaluation


Student's name ______________________________________________________________


Partner's Name ______________________________________________________________


Watch the Two Videos on NMR & Pulsed NMR on-line

Pre-lab Questions and Sign Off Sheet

It is your responsibility to discuss this lab with an instructor before your first day of your scheduled lab period. This signed sheet must be included as the first page of your report. Without it you will lose grade points. You should be prepared to discuss at least the following before you come to lab:

  1. What is nuclear magnetic resonance? What is resonating? What magnetic fields do we apply to our sample? What do these fields do? What is Larmor precession?
  2. Referring to Figure 6 of this lab manual, in what directions are the DC field, the modulating (60 Hz) field, and the RF field? What do these fields do? How do these fields relate to question 1? When you arrive in lab, examine how these fields are actually oriented in space.
  3. What are T1 and T2?
  4. How does pulsed NMR differ from the continuous wave NMR experiment?
  5. What is "free nuclear induction"?
  6. What is a "spin echo"?


Staff Signature ______________________________________________ Date ____________

Completed on the first day of lab? (circle) Yes / No

Mid-lab Questions and Sign Off Sheet

On day 3 of this lab, you should have successfully produced an H2O absorption resonance picture, with a calibrated frequency axis.

  1. What is the Lamor Frequency in Mhz? Show them to a GSI and get a signature.


Staff Signature ______________________________________________ Date ____________

Completed on the third day of lab? (circle) Yes / No


On day 7 of this lab, you should have successfully observed the spin echo on the scope. Show it to an instructor and ask for a signature.


Staff Signature ______________________________________________ Date ____________

Completed on the seventh day of lab? (circle) Yes / No

Other Questions to answer about this experiment as you go along

  1. Quantum Mechanics and E & M: Classical absorption and dispersion curves for light going through matter (covered in any 110 text). In the NMR lab you will encounter similar absorption and dispersion curves. Why should optical absorption and dispersion be so similar to NMR absorption and dispersion? [Hint: think of the relevant Hamiltonians!]
  2. E & M: The experiment relies on the induced voltage generated in a "pickup" coil surrounding your sample (in more than one way). Study the sample NMR head apparatus and understand how a magnetization induced in your sample can be "picked up" by the coil (which is basically just an RLC circuit). Does the frequency of the RF field affect the pickup coil's response?



INCLUDE THIS SHEET AS THE FIRST PAGE OF YOUR REPORT


Physics 111 Advanced Lab Student Evaluation of Experiment

Now that you have completed this experiment, we would appreciate your comments. Please take a few moments to answer the questions below, and feel free to add any other comments. Since you have just finished the experiment it is your critique that will be the most helpful. Your thoughts and suggestions will help to change the lab and improve the experiments. Please be as specific as possible, using both sides of the paper as needed, and turn this in with your report. Thank you!

Experiment name:____________________________________________ Date: ________________________

How was the write-up for this experiment? How could it be improved?




How easily did you get started with the experiment? What sources of information were most/least helpful in getting started? Were the reprints appropriate? Did the Pre-lab discussion help? Did you need to go outside the course materials for assistance? What additional materials could you have used?




What did you like and/or dislike about the experiment?





Did you like the WIKI or does it need improvement? How?





Would you recommend this lab to fellow student? Why or why not?





What advice would you give to a friend just starting this experiment?





Did you get this write up from the 111-Lab WEB site or a copy. ____________________________

How would you rate the Physics 111- Lab WEB sites? (1 = poor; 5 = good.)

1 2 3 4 5

Comments:




Please circle the abbreviations of the other labs you have done. Overall quality of this experiment?
ATM BMC BRA COM CO2 GMA HAL 1 2 3 4 5
HOL JOS LIF LLS MNO MOT MUO Poor Average Good
NMR NLD OPT OTZ RUT SHE XRA

Thank you from the 111-Lab Staff

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