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Molecular identifications in experiments with astronomical ice analogues: new data, old strategies, and the N2 + acetone system

A recent publication on the radiation chemistry and IR spectroscopy of N 2 + acetone ices is used to illustrate some of the difﬁculties encountered in the study of astronomical ice analogues. Concerns and problems are identiﬁed and suggestions for their solution are presented, including new infrared (IR) spectra of amorphous ices. The hazards of using peak positions alone for assignments of the IR spectra of irradiated ices are illustrated, and the importance of considering the underlying reaction chemistry is shown. Several experiments are proposed as a way to investigate the behaviour of acetone in cold, extraterrestrial environments. Electronic versions of IR spectra are provided and several new refractive indices of ices are reported.