title: Bloch-Redfield-Wangsness theory engine implementation using symbolic processing software.
abstract: We describe a general method for the automated symbolic processing of Bloch-Redfield-Wangsness relaxation theory equations for liquid-phase spin dynamics in the algebraically challenging case of rotationally modulated interactions. The processing typically takes no more than a few seconds (on a contemporary single-processor workstation) and yields relaxation rate expressions that are completely general with respect to the spectral density functions, relative orientations, and magnitudes of the interaction tensors, with all cross-correlations accounted for. The algorithm easily deals with fully rhombic interaction tensors, and is able, with little if any modification, to treat a large variety of the relaxation mechanisms encountered in NMR, EPR, and spin dynamics in general.
authors.affiliation: Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK. ilya.kuprov@chem.ox.ac.uk
authors.forename: Ilya
authors.initials: I
authors.lastname: Kuprov
authors.forename: Nicola
authors.initials: N
authors.lastname: Wagner-Rundell
authors.forename: P J
authors.initials: PJ
authors.lastname: Hore
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D011381:Programming Languages; D012984:Software; D013113:Spin Labels
chemical_list: D013113:Spin Labels