The sight line towards WD2116+736 with FUSE: H, N, O and more.

WD2116+736 is a hot DA white dwarf probably located outside the Local Bubble. Atomic and molecular gas is seen in the FUSE spectra in the form of H I, C II, C II*, N I, N II, O I, Si II, P II, Ar I, Fe II and H-2. This paper presents a study of the gas physical conditions along this sight line. Deuterium is also present toward WD2116+736. Our analysis, however, shows that an accurate measurement cannot be given with the data currently available. Analysis of molecular hydrogen suggests the presence of warm (similar to 420 K) neutral gas with a molecular fraction of similar to 10(-5). Our results for the O/H, N/H and Fe/H ratios are consistent, with the ratios found for the Local Bubble.