In addition to all other vacuum responsibilities, the Vacuum group maintains and operates beamline U9A to test materials for vacuum compatibility. Thus the Vacuum group is also a beamline User, contributing to NSLS by producing technical papers primarily in the area of Photon-Stimulated Desorption (PSD). Research by the Vacuum group is focused on material testing, specifically looking at the release of gases from the surface of a metal. Surface treatments and cleaning processes are also evaluated. This work is done for BNL as well as many other light sources around the world.