Atomic Transition Probabilities of Neutral Calcium
  The goals of this study are 1) to test the best theoretical transition
probabilities for Ca I (a relatively light alkaline earth spectrum) from a
modern ab initio calculation using configuration interaction plus many body
perturbation theory against the best modern experimental transition
probabilities, and 2) to produce as accurate and comprehensive a line list of
Ca I transition probabilities as is currently possible based on this
comparison. We report new Ca I radiative lifetime measurements from a
laser-induced fluorescence (LIF) experiment and new emission branching fraction
measurements from a 0.5 m focal length grating spectrometer with a detector
array. We combine these data for upper levels that have both a new lifetime and
new branching fractions to report log(gf)s for two multiplets consisting of
nine transitions. Detailed comparisons are made between theory and experiment,
including the measurements reported herein and a selected set of previously
published experimental transition probabilities. We find that modern theory
compares favorably to experimental measurements in most instances where such
data exist. A final list of 202 recommended transition probabilities is
presented, which covers lines of Ca I with wavelengths ranging from 2200 -
10,000 Angstroms. These are mostly selected from theory, but are augmented with
high quality experimental measurements from this work and from the literature.
The recommended transition probabilities are used in a redetermination of the
Ca abundance in the Sun and in the metal-poor star HD 84937.
