TPD-QMS results for the detections of H₂S₂. Panel a: TPD-QMS spectra of m/z = 32 (blue), 34 (red), 64 (green), 65 (purple), and 66 (yellow) after deposition of apure H₂S ice and codeposition of H₂S + H with analogous experimental conditions. Spectra are offset for clarity and shown in the temperature range relevant to H₂S₂ thermal desorption. Panel b: mass fragmentation pattern of H₂S₂ generated by 70 eV electron ionization as measured in this work.