Complementary QMS and infrared data acquired during TPD confirming the OCS detection. Panel a: TPD-QMS signal recorded for m/z = 60 after the deposition of CO + H₂S + H (experiment 1, gray), as well as those for m/z = 63 (dark red) and m/z = 60 (light red) after the deposition of ¹³C¹⁸O + H₂S + H (experiment 3). The blue shadowed region denotes the range of desorption, and the dashed line highlights the peak desorption temperature. Signals from different experiments are offset for clarity. Panel b: area of the OCS v₁ band as a function of temperature during TPD following the deposition of experiment 1. The uncertainties in the horizontal axis are due to the substrate temperature variation of ~10 K during the collection of each IR TPD spectrum. The blue shadowed area and dashed line are reproductions of the range and peak position shown in panel a.