Scheme of the main chamber of ISAC. The VUV-light intersects three MgF₂ windows before it enters the UV-spectrometer, but the emission spectrum that the ice experiences corresponds to only one MgF₂ window absorption, the one between the VUV-lamp and the ISAC main chamber. FTIR denotes the source and the detector used to perform infrared spectroscopy. QMS is the quadrupole mass spectrometer used to detect gas-phase species. PMT is the photomultiplier tube that makes the ultraviolet spectroscopy possible.