Nuclear and Electronic Relaxation

Part 1 Introduction: the concept of relaxation in molecular spectrosocpy; magnetic resonance; the spin Hamiltonian formalism; hyperfine coupling; effect of hyperfine coupling on relaxation; statistical description of spin relaxation; correlation time for the nucleus-electron coupling; pulsed versus continuous-wave magnetic resonance. Part 2 Relaxation times: definition of a relaxation time at zero magnetic field; definition of T1, T2, T1p; the Bloch equations; nuclear T1 and T2: and instructive picture; chemical exchange as a source of relaxation; relaxation of a system constituted by spin pairs; the analogies between nuclear and electron relaxation. Part 3 Measurement of relaxation times and related experiments: experimental techniques for the measurement of nuclear longitudinal relaxation time T1; selective and non-selective nuclear T1; nuclear overhauser effect experiments; experimental techniques for the measurement of nuclear transverse relaxation time T2; measurement of T1p - spin-locking expiments; the field-cycling experiment, useful for determing and nuclear relaxation times at low magnetic field; effect of short relaxation times on 2D NMR experiments; experimental techniques for the measurement of electron relaxation times T1 and T2; the ENDOR experiment; measurement of T1 and T2 (Nuclear-Electron Cross-Relaxation). Part 4 Electron Relaxation in dilute systems: physical picture of electron relaxation; spin-orbit coupling; electron relaxation mechanisms in the solid state - crystal vibrations, electron spin-phonon coupling; electron relaxation in solution; some numerical values. Part 5 Nuclear relaxation in paramagnetic systems: mechanisms of nuclear relaxation through coupling with unpaired electrons; dipolar relaxation; a pictorial description of dipolar relaxation; diffusion-controlled dipolar relaxation; contact relaxation; Curie spin relaxation; effects of splitting the S Manifold at Zero magnetic field - isotropic hyperfine coupling with the metal nucleus, anisotopic hyperfine coup;oing with the metal nucleus; g-Anisotropy, zero field splitting; Redfield limit and beyond. Part 6 Electron and nuclear relaxation through NMRD: what is NMRD?; copper(II) systems; cobalt(II) systems; nickel(II) systems; manganese(II) systems; other metal ions; field dependence of . Part 7 Magnetic couples systems: effect of magnetic coupling on the electron relaxation times - unlike spin pairs, like spin pairs; NMR parameters in magnetic coupled systems - isotropic shift, part contents.