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)
