Nuclear Magnetic Resonance (NMR) in liquids
Supervisor: Dr. Christian Chmelik
This experiment imparts the basics of NMR in external magnetic
fields. The measurements are done using a modern NMR spectrometer MARAN
(Oxford Instruments) with a resonance frequency for protons of 20MHz.
The data analysis is done with a PC. The spectrometer is controlled by
specially designed software RINMR, which provides full control over
design of pulse programs, spectrometer operation and data analysis.
Theoretical basics:
- Equilibrium
magnetization in a static magnetic field
- Equation
of motion of the magnetization
- Influence
of a high-frequency field, 90°- and 180° pulses
- Longitudinal and transversal relaxation
Experimental tasks:
- Calibration of the 90°- and 180° pulses
- Determination
of longitudinal relaxation times
- Registration
of free induction, determination of the homogeneity of the magnetic
field
- Hahn echo
pulse sequence, Carr-Purcell-Meiboom-Gill pulse sequence
- Determination
of transversal relaxation times
- Determination of the coefficient of diffusion of a liquid
in an inhomogeneous magnetic field (in future)
- Resolution
of NMR-signals of a two component mixture (measurement of the chemical
shift)
