Abstract
Binary and ternary gas mixtures of H 2O, CO 2, NH 3 and CH 4 were condensed at 10 −6 mbar onto a KBr cold finger at 10 K. The composition of the few micrometre thick layers has been determined by infrared spectroscopy in transmission mode. The condensation dynamics together with the predominant matrix effect studied as a function of gas composition, deposition time and ice layer thickness reveal a lower condensation probability for the more volatile components CH 4 and CO 2 in mixtures of H 2ONH 3CH 4 and H 2ONH 3CO 2, respectively, with varying composition. The phenomena explain representative cases of early condensation and accretion processes of icy layers on interstellar grains.
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