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The chemical content of the planetary nebula NGC 3918 is investigated throughdeep, high-resolution (R~40000) UVES at VLT spectrophotometric data. Weidentify and measure more than 750 emission lines, making ours one of thedeepest spectra ever taken for a planetary nebula. Among these lines we detectvery faint lines of several neutron-capture elements (Se, Kr, Rb, and Xe),which enable us to compute their chemical abundances with unprecedentedaccuracy, thus constraining the efficiency of the s-process and convectivedredge-up in the progenitor star of NGC 3918.

A window on the efficiency of the s-process in AGB stars: chemical abundances of n-capture elements in the planetary nebula NGC 3918