Atomic transition probabilities of F I spectral lines from3s−3pand3p−3dtransition arrays

Abstract

We have measured the relative transition probabilities of about $100 3s\ensuremath{-}3p$ and $3p\ensuremath{-}3d$ lines of neutral fluorine in the visible and near-infrared spectrum with a wall-stabilized high-current arc, which is operated under conditions very close to partial local thermodynamic equilibrium. The set of measured lines includes about 40 intersystem transitions. Our data have been placed on an absolute scale by normalizing several strong transitions to the results of the OPACITY Project calculations, which are expected to be quite accurate for such transitions. We estimate that the uncertainties of our absolute transition probability values are in the \ifmmode\pm\else\textpm\fi{}15% to \ifmmode\pm\else\textpm\fi{}20% range, while the uncertainties of the relative values do not exceed 6%, except for very weak transitions. Our results indicate that especially for $3p\ensuremath{-}3d$ transitions appreciable departures from LS coupling are encountered. Comparisons with other results indicate that earlier experimental data agree well with ours on a relative scale, but need to be renormalized.