Fig. 3

IR spectra of three H2CO:H2O ice mixtures at 15 K. The concentration ratio of each species in the mixture is determined from the integration of its characteristic IR bands. Mixture a) is a layered system where H2CO is on top of H2O, mixture b) is an homogeneous mixture of H2CO:H2O, and mixture c) is a layered system where H2O is on top of H2CO. The observation of small bands at around 3700 cm-1, attributed to dangling OH, δOH, confirms that the ASW deposited at 15 K is porous.
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