摘要: The composition of ices in dense interstellar clouds as revealed by the infrared absorption band spectra obscured embedded or background stars is reviewed, and role grain surface chemistry forming frozen species from accreting gas molecules discussed. We summarize observational evidence for presence a number ice phases distinct composition, discuss how this segregation may have been caused. Possible energetic processing indicated. It emphasized study circumstellar regions lead to better insight coupling chemical conditions evolution protostar.
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