title: General and efficient simulation of pulse EPR spectra.
abstract: We present a rather general and efficient method of simulating electron-spin echo spectra for spin systems where the microwave frequency does not simultaneously excite EPR transitions that share a common level. The approach can handle arbitrary pulse sequences with microwave pulses of arbitrary length and strength. The signal is computed as a sum over signals from the electron coherence transfer pathways contributing to the detected echo. For each pathway, amplitudes and frequencies of the signal components are computed and used to construct a spectral histogram from which the time-domain signal is obtained. For multinuclear spin systems, the nuclear subspace is factorized to accelerate the computation. The method is also applicable to high electron spin systems with significant zero-field splitting and to pulse electron-nuclear double resonance experiments. The method is implemented in the software package EasySpin, and several illustrative calculations are shown.
authors.affiliation: Department of Chemistry, University of California, Davis, CA 95616, USA. sstoll@ucdavis.edu
authors.forename: Stefan
authors.initials: S
authors.lastname: Stoll
authors.forename: R David
authors.initials: RD
authors.lastname: Britt
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004578:Electron Spin Resonance Spectroscopy; D008872:Microwaves; D008956:Models, Chemical; D012984:Software