  Radiative lifetimes, accurate to +/- 5%, have been measured for 49
even-parity and 14 odd-parity levels of Gd II using laser-induced fluorescence.
The lifetimes are combined with branching fractions measured using Fourier
transform spectrometry to determine transition probabilities for 611 lines of
Gd II. This work is the largest-scale laboratory study to date of Gd II
transition probabilities and the first using a high performance Fourier
transform spectrometer. This improved data set has been used to determine a new
solar photospheric Gd abundance, log epsilon = 1.11 +/- 0.03. Revised Gd
abundances have also been derived for the r-process-rich metal-poor giant stars
CS 22892-052, BD+17 3248, and HD 115444. The resulting Gd/Eu abundance ratios
are in very good agreement with the solar-system r-process ratio. We have
employed the increasingly accurate stellar abundance determinations, resulting
in large part from the more precise laboratory atomic data, to predict directly
the Solar System r-process elemental abundances for Gd, Sm, Ho and Nd. Our
analysis of the stellar data suggests slightly higher recommended values for
the r-process contribution and total Solar System values, consistent with the
photospheric determinations, for the elements for Gd, Sm, and Ho.
