  Neutron(n)-capture elements are produced by s-process nucleosynthesis in low-
and intermediate-mass AGB stars, and therefore can be enriched in planetary
nebulae (PNe). In the last ten years, n-capture elements have been detected in
more than 100 PNe in the Milky Way and nearby galaxies. In some objects,
several different n-capture elements have been detected, providing valuable
constraints to models of AGB nucleosynthesis and evolution. These detections
have motivated theoretical and experimental investigations of the atomic data
needed to derive accurate n-capture element abundances. In this review, I
discuss the methods and results of these atomic data studies, and their
application to abundance determinations in PNe.
