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- W2803019916 abstract "Spin–lattice relaxation is the irreversible evolution of a spin system toward thermal equilibrium with the orbital degrees of concern, by priority, systems where it is a good approximation to treat the lattice classically and the spin–lattice coupling as a random perturbation of the spin system: molecules in solution or insulating solids where the nuclei are relaxed by parafreedom of the medium in which the spins are embedded, called the lattice. This encompasses all spin variables amenable to observation: longitudinal or transverse magnetizations, spin–spin energy or multiple-quantum coherences. It is only when the evolution is due to static spin–spin interactions that we will speak of spin–spin relaxation. Although it attracted attention even before the existence of resonance, for electronic spin systems (1) it is mostly with the development of resonance methods that spin–lattice relaxation proved to be a central concept, both as a fundamental topic in thermodynamics and as a tool of prime importance for investigating the dynamical and structural properties of condensed matter. This is particularly so in NMR. The basic understanding and the elaboration of the main formalisms of nuclear spin–lattice relaxation were developed from 1948 to about 1960, in parallel with those of electronic spins. The basic references are Bloembergen, Purcell, and Pound (BPP) (2), Wangsness and Bloch (3), and Bloch (4), Solomon (5), Abragam (6), Redfield (7), Bloch (8), and Tomita (9). These works were described in detail by Abragam (6) and Slichter (10). Many developments have and continue to take place on various extensions and specific applications of spin– lattice relaxation. A good introduction, with references, can be found in the “Relaxation” articles of the Encyclopedia of Nuclear Magnetic Resonance (11). The purpose of this article is somewhat different. It is to present ab initio a compact, clear, and complete description of a general formalism of spin–lattice relaxation theory, with two objectives: provide the reader with a well-defined procedure for performing relaxation calculations of practical usefulness, together with a full and convincing justification of its derivation. As a corollary, its purpose is not to give credit nor to analyze in detail the various relaxation mechanisms, except when needed for pedagogy, nor to provide an extensive bibliography. Although of general applicability, the formalism will" @default.
- W2803019916 created "2018-05-17" @default.
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- W2803019916 date "2001-01-01" @default.
- W2803019916 modified "2023-09-23" @default.
- W2803019916 title "ADVANCES IN MAGNETIC RESONANCEFormal Theory of Spin–Lattice Relaxation" @default.
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