NNR IN RAPIDLY ROTATED METALS By - Nottingham eTheses ...

2.3.5 Quadrupole Relaxation 26
(i) Single Phonon 27
(ii) Four Phonon 27
(iii) Two Phonon (Raman) 27
CHAPTER 3. NARROWING THE NUCLEAR RESONANCE SPECTRUM BY
MACROSCOPIC ROTATION
3.1 Introduction 31
3.2 Isotropic Motion 32
3.3 The Dipolar Interaction 34
3.4 The Quadrupole Interaction 36
3.5 Frequency-Shift Mechanisms 37
3.6 Indirect Spin-Spin Interaction 38
3.7 The Effect of Rotation on the Nuclear Lineshape 40
CHAPTER 4. EXPERIMENTAL ROTATION SYSTEMS
4.1 Introduction 43
4.2 Aspects of Rotor Design 44
4.2.1 Materials 44
4.2.2 Size 44
4.2.3 Stresses 45
4.2.4 The Problem of Whirl and Rotor Balance 45
4.2.5 The Driving Jets 46
4.3 The Conical Rotor System 47
4.3.1 Description 47
4.3.2 Experimental Details 48
4.3.3 Rotor Materials 49