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International audienceAmong all existing complex organic molecules, glycolaldehyde HOCH2CHO and ethyleneglycol HOCH2CH2OHare two of the largest detected molecules in the interstellar medium.Weinvestigate both experimentally and theoretically the low-temperature reaction pathways leadingto glycolaldehyde and ethylene glycol in interstellar grains. Using infrared spectroscopy,mass spectroscopy and quantum calculations, we investigate formation pathways of glycolaldehydeand ethylene glycol based on HCO• and •CH2OH radical–radical recombinations.We also show that •CH2OH is the main intermediate radical species in the H2CO to CH3OHhydrogenation processes.We then discuss astrophysical implications of the chemical pathwaywe propose on the observed gas-phase ethylene glycol and glycolaldehyde

monthly notices of the royal astronomical society

Formation mechanism of glycolaldehyde and ethylene glycol in astrophysical ices from HCO•and•CH2OH recombination: an experimental study