Results of the experiment of ASW at a temperature of 60 K. In the top row the deconvolved infrared components, which trace the solid state, are given, based on RAIRS during VUV irradiation (panel a) and temperature programmed desorption (TPD) in panel b). In the bottom row the data from the quadrupole mass spectrometer (QMS) is presented, which trace the gas phase. The left column shows data acquired during VUV irradiation (shaded areas indicate when the VUV shutter is open) and on the right during TPD. In panel c) ¹³CO is shown, as measuring the main isotopologue (¹³C¹⁸O) would saturate the QMS. The ¹⁶O isotope is present in the CO sample at a level of 5%. The TPD QMS data in panel d) between 140–150 K is unreliable due to a nonlinear temperature artifact during heating of the sample.