Infrared spectrum after deposition of a pure H₂S ice (black) and the difference spectra after exposure to H atoms for 20 min (red), 40 min (blue), and 60 min (green). Superimposed onto the difference spectra are the corresponding Gaussian fittings of the H₂S band (purple), H₂S₂ band (yellow), and the resulting convoluted feature (brown). The spectra have been offset for clarity.