Theory of Spin Relaxation via Quantum-Molecular Systems: Resonance Effects

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Abstract
A relaxation equation is derived for the spin‐density matrix on the assumptions that (1) the spins are weakly coupled to the molecular degrees of freedom which are described quantum mechanically and (2) the relaxation of the molecular systems is well represented by a general time‐independent relaxation matrix which can include effects of weak as well as strong collisions. The irreversibility of the spin relaxation is achieved with no further assumptions, and is given in detail in terms of the normal modes of relaxation of the molecular systems. It is also pointed out that the present formulation inherently includes the assumption of resonant‐type interactions between molecular systems and spins.