Phase transition of CO ice: driving the molecular complexity on interstellar dust grains

RAIRS spectra of CO ice of different thicknesses during warm-up. The file is named by the thickness. The CO ices were deposited onto np-ASW at 6 K and warmed up at 0.2 K/minute.

The temperature corresponding to each spectrum is marked in the "temperature" column. 2. CO:CO2 mixture warm-up. RAIRS spectra of the mixture of 9 ML of CO and 1 ML of CO2 during warm-up.

The CO:CO2 ice mixture was deposited onto np-ASW at 6 K and warmed up at 0.2 K/minute. The temperature corresponding to each spectrum is marked in the "temperature" column. 3. CO:CO2 mixture isotherm.

RAIRS spectra of the mixture of 9 ML of CO and 1 ML of CO2 deposited at 6 K and then flash heated to a target temperature to do isotherm experiments. The target temperatures are shown in the file name.