A new gas system for automated in situ powder diffraction studies at the European Synchrotron Radiation Facility

A new gas dosing rig built for the high-resolution powder diffraction beamline (ID31) at the ESRF is described. The rig is fully controlled and monitored by the beamline control software, enabling automated absorption and desorption of fixed pressures of gases up to 100 bar (10(7) Pa) for in situ structural studies. The rig has successfully been used on ID31 as well as other beamlines at the ESRF.