Abstract
Preliminary measurements of the total ion desorption yields of several pure and mixed molecular ices have been carried out using the He I 584 Å resonance radiation as the incident photon beam. The various ice samples were prepared at 77 K in an ultrahigh vacuum system. The total ion desorption yields of H 2O ices, D 2O ices, CH 3OH ices, CD 3OD ices, H 2O-CH 3OH mixed ices and D 2O-CD 3OD mixed ices were determined. Minor isotopic effects on the ion desorption processes of the above-mentioned ices have been observed. There is a clear enhancement in the ion desorption yields of water-methanol mixed ices in comparison with pure ices. Such data are required in the interpretation of the gaseous atmospheres of comets, asteroids, icy planets, satellites and rings, and interstellar icy grains.
Published Version
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