Atomic transition probabilities in TbII with applications to solar and stellar spectra

Absolute atomic transition probabilities are reported for many of the stron gest lines in Tb It (the second spectra of terbium). Branching fractions we re measured from Fourier transform spectrometer (FTS) data and combined wit h radiative lifetimes from recent laser-induced fluorescence measurements t o determine these transition probabilities. Due to the absence of an extens ive published classified line list for Th ii, accurate line positions in th e FTS data as well as hyperfine structure patterns (described in the adjace nt paper) were used to verify line classifications reported herein. These l aboratory data are applied to determine photospheric terbium abundances in the Sun and the Galactic halo giant CS 22892-052.