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Electron-stimulated desorption (ESD) of cryosorbed molecules on surfaces is aprocess of relevance to fields as varied as vacuum dynamics in accelerators andastrochemistry. While desorption from such molecular systems induced by keVelectrons and fast ions has been extensively studied, the sub-keV electronregime is comparatively little known. We measured and quantifiedelectron-stimulated desorption from molecular ice systems (layers of N$_2$, CO,CO$_2$, Ar and H$_2$O/D$_2$O condensed at cryogenic temperatures) in the150-2000 eV electron energy range. In this regime stopping power is no longersufficient to explain the electron energy dependence of ESD yields. Weintroduce the notion of desorption-relevant depth, which characterizes thetransition between two energy deposition regimes near the surface. We thenapply this notion to the different systems, showing how ESD in the sub-keVregime can for example reveal the differences in species diffusion incrystalline and porous amorphous CO$_2$ ices.

Electron-stimulated desorption from molecular ices in the sub-keV regime