Abstract
The R-matrixmethod is used to study electron collisions with the molecular radical sulfurfluoride (SF). The elastic and excitation cross sections of the six lowest-lyingelectronically excited states of the SF radical are presented for incident electronenergies up to 15 eV. These excited states have symmetries 4Σ−, 2Σ−, 2Δ, 2Σ+, 2Π and4Π, and vertical excitation energies in the range 3.32–9.48 eV. Configurationinteraction (CI) wavefunctions are used to represent the target states. Inour CI model we keep the 1σ, 2σ, 3σ, 4σ and1Πmolecular orbitals fully occupied and the remaining 13 electrons are free tooccupy the 5σ, 6σ, 7σ, 8σ, 9σ, 2Π and3Πorbitals. We detect a bound state of SF− of 1Σ+ symmetrywith an adiabatic electron affinity of 1.46 eV. There are two shape resonances of 3Π and 1Π symmetriescentred around 1 and 2 eV respectively, with a common configuration 3Π38σ. Ourcalculations also predict four core-excited shape resonances of symmetries 3Σ−, 1Σ−,3Π and1Πin the energy range 8–13 eV having configurations 3Π28σ2 and 2Π33Π48σ.
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