Pulsed Nuclear Magnetic Resonance
About the experiment
Atomic nuclei have spins and magnetic moments, and the nuclei in a liquid sample can be polarized in a high magnetic field. Application of transverse electromagnetic radiation at the Larmor frequency will depolarize the sample, and this frequency can be measured by watching the depolarization signal with a "marginal oscillator". You can measure the proton magnetic moment, and verify for yourself that the spin t/z proton is not a Dirac particle. You can also measure the time constants for depolarization, which depend on the chemical environment, and provide the information used in MRI imaging.
What you will learn
-
Physics principle behind the medical diagnostic procedure known as Magnetic Resonance Imaging (MRI)
-
Basic techniques to polarize and depolarize an ensemble of nuclear spins
-
Techniques that will help you prepare yourself to perform the Optical Pumping experiment
Preparation
Required reading:
Recommended reading:
- A Conceptual Tour of TeachSpin's PNMR
- Introduction to NMR
- The Physics of Atoms and Quanta, Introduction to Experiments and Theory, H. Haken and H.C. Wolf, Chapter 20.
- Principles of Magnetic Resonance, C.P. Slichter, Springer Chapters 1-2
Related Experiments:
Supplementary materials
Videos:
Nuclear Magnetic Resonance (NMR)- Part-1 CW NMR [from UC Berkeley]
- Part-2 Pulsed NMR [from UC Berkeley]
References and Notes:
- Chapter 14.6 "Nuclear Magnetic Resonance" from Modern Physics by F.J. Blatt
- N. Bloembergen, E.M. Purcell, and R.V. Pound, Relaxation Effects in Nuclear Magnetic Resonance Absorption, Phys. Rev. 73(679), 1984.
- NMR RF circuit
- Ion effective magneton numbers
- viscosity of liquids
- viscosity of aqueous glycerine
- spin relaxation in epoxy
- spin relaxation in glycerin
