Fig. 4
Infrared spectra from 4000 to 1000 cm−1 for the N2-CH4 (left) and the N2-CH4+CD4 ices (right). Spectra are taken at different temperatures during the slow warming-up (0.1 K min−1). No spectra were recorded for the D-rich ice between 100 and 300 K because of a technical problem with the repeated recording feature FTIR spectrometer.
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