title: First-principles calculation of electron spin-rotation tensors.
abstract: Using Curl's Hamiltonian (Curl, R. F. Mol. Phys. 1965, 9, 585) first-principles calculations at the Hartree-Fock and various coupled-cluster (CC) levels based on a perturbative scheme are reported. The effects of basis-set dependence and electron correlation have been investigated by performing benchmark calculations for a set of radicals comprising 12 species and 14 electronic states. In comparison to experimental results, the electron spin-rotation tensor is obtained with a 10-15% accuracy when using the CC singles and doubles approximation and a triple-zeta quality basis set. Some improvements are seen when triple excitations are considered via the CC singles, doubles, and triples model.
authors.affiliation: Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, P.O. Box 32, H-1518, Budapest 112, Hungary.
authors.forename: György
authors.initials: G
authors.lastname: Tarczay
authors.forename: Péter G
authors.initials: PG
authors.lastname: Szalay
authors.forename: Jürgen
authors.initials: J
authors.lastname: Gauss