  In this work, we demonstrate a new system for the examination of gas
interactions with surfaces via Atom Probe Tomography. This system provides the
capability to examine the surface and subsurface interactions of gases with a
wide range of specimens, as well as a selection of input gas types. This system
has been primarily developed to aid the investigation of hydrogen interactions
with metallurgical samples, to better understand the phenomenon of hydrogen
embrittlement. In its current form, it is able to operate at pressures from
10^-6 to 1000 mbar (abs), can operate using a variety of gasses, and is
equipped with heating and cryogenic quenching capabilities. We use this system
to examine the interaction of hydrogen with Pd, as well as the interaction of
water vapour and oxygen in Mg samples.
