TPD-QMS results for the detection of H₂S. Panel a: TPD-QMS spectra of m/z = 32 (blue) and m/z = 34 (red) after deposition of a pure H₂S ice and codeposition of H₂S + H with analogous experimental conditions. Spectra are offset for clarity and shown in the temperature range relevant to H₂S thermal desorption. Panel b: Comparison between the relative intensities of m/z = 32 and 34 desorbing at 85 K in both H₂S and H₂S + H experiments together with the standard fragmentation pattern of H₂S from NIST.