title: Measurement of spin-lattice relaxation times in EPR with enhanced orientation selectivity.
abstract: Two schemes for the measurement of orientation-dependent spin-lattice relaxation times are introduced, which combine the inversion-recovery experiment with electron-Zeeman-resolved or right-angle wiggling EPR. The principles of the experiments are outlined and their performance is illustrated by examples of application. With the electron Zeeman-resolved approach the relaxation times of two metal complexes with different g values are unraveled, whereas with right-angle wiggling the orientation-dependent relaxation behavior of a metal complex with large hyperfine anisotropy is analyzed.
authors.affiliation: Physical Chemistry, ETH Zürich, CH-8093 Zurich, Switzerland. eichel@phys.chem.ethz.ch
authors.forename: Rüdiger-A
authors.initials: RA
authors.lastname: Eichel
authors.forename: Josef
authors.initials: J
authors.lastname: Granwehr
authors.forename: Arthur
authors.initials: A
authors.lastname: Schweiger