Fig. 3
Infrared spectra from 4500 to 700 cm−1 from the N2-CH4 (left) and the N2-CH4+CD4 ices (right). The bottom spectra are the initial deposited ice (multiply by 0.2 for visibility), the middle spectra are those after a total dose of 8 eV molecule−1, and top spectra are the final spectra taken at 19 eV molecule−1. Arrows (triangles) below the IR spectra (right panel) indicate the CD4 (CH4) bands used to estimate the initial D/H ratio from the labelled ice according to Eq. (1).
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