title: Two-dimensional hyperfine sublevel correlation spectroscopy: powder features for S=1/2, I=1.
abstract: The lineshapes of two-dimensional magnetic resonance spectra of disordered or partially ordered solids are dominated by ridges of singularities in the frequency plane. The positions of these ridges are described by a branch of mathematics known as catastrophe theory concerning the mapping of one 2D surface onto another. We systematically consider the characteristics of HYSCORE spectra for paramagnetic centers having electron spin S=1/2 and nuclear spin I=1 in terms of singularities using an exact solution of the nuclear spin Hamiltonian. The lineshape characteristics are considered for several general cases: zero nuclear quadrupole coupling; isotropic hyperfine but arbitrary nuclear quadrupole couplings; coincident principal axes for the nuclear hyperfine and quadrupole tensors; and the general case of arbitrary nuclear quadrupole and hyperfine tensors. The patterns of singularities in the HYSCORE spectra are described for each case.
authors.affiliation: Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russian Federation. maryasov@ns.kinetics.nsc.ru
authors.forename: Alexander G
authors.initials: AG
authors.lastname: Maryasov
authors.forename: Michael K
authors.initials: MK
authors.lastname: Bowman
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D008962:Models, Theoretical