1. Nuclear Magnetic Resonance
ANIMATED ILLUSTRATIONS
MS Powerpoint Presentation Files
Uses Animation Schemes as available in MS XP or MS 2003 versions
A class room educational material
File-4 Principles of NMR signal detection:
NMR Spectrum

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Oscillation Level reduced when there is ESR absorption
Oscillation Level at fixed frequency ‘ν’ When No ESR
Detected DC Level No ESR 2
Oscillator
Oscillation Level Detector 1
Φ Shifter
Reduced DC On ESR Absorption hν=gβH
Detected Oscln Level DC
No oscillations
The role of a phase Φ shifter in the diagram would be explained in the succeeding slides
If the Current is increased from 0 to beyond resonance field, then, the field [ Ht ] increases with time and causes resonance at resonance field value Ht
hν=gβH 2
Current Source 1
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3. Defocusing and signal decay
Z - Magnetization along the Field
XY - Magnetization induces
RF signal in the receiver coil Z
Defocusing and signal decay Y X
Output from receiver coil - FID
RF Pulse : π/2 pulse to flips the magnetization into xy plane
CW Oscillator
GATE
Receiver- detector
Display Monitor Recorder
RF Pulse
Probe In Magnet
DC Pulse generator

4. Real
imaginary
OUTPUT from the FFT Program: Time domain FID and the Frequency domain two line NMR spectrum

6. Spectrometer operating frequency decreases
Distance of separation between the multiplets varies with the field
Field= H
Separation within the multiplets remain unchanged with the field
H/2
H/4
H/6.6