title: Nuclear-spin relaxation in nonrigid molecules: discrete multisite local dynamics combined with anisotropic molecular reorientation.
abstract: Nuclear-spin relaxation is considered in a molecular system undergoing two types of dynamic processes: asymmetric-top small-step rotational diffusion and discrete multisite local jumps. The two processes are assumed to be uncorrelated. Time correlation functions for relevant rank-two interactions and corresponding spectral density functions are derived for a general relation between the characteristic rate constants. In addition, limiting cases of fast and slow local motions and of some specific jump conditions are also investigated.
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland. bernat@ibb.waw.pl
authors.forename: Piotr
authors.initials: P
authors.lastname: Bernatowicz
authors.forename: Jozef
authors.initials: J
authors.lastname: Kowalewski
authors.forename: Slawomir
authors.initials: S
authors.lastname: Szymanski
mesh_terms: D016880:Anisotropy; D002244:Carbon / Q000737:chemistry; D002627:Chemistry, Physical / Q000379:methods*; D004058:Diffusion; D006859:Hydrogen / Q000737:chemistry; D007700:Kinetics; D008956:Models, Chemical; D015233:Models, Statistical; D008962:Models, Theoretical; D008968:Molecular Conformation; D013997:Time Factors
chemical_list: D002244:Carbon; D006859:Hydrogen