论文标题
从子击状态中的分子冰的电子刺激的解吸
Electron-stimulated desorption from molecular ices in the sub-keV regime
论文作者
论文摘要
表面上的冷冻分子的电子刺激解吸（ESD）是与加速器和天体化学中真空动态的磁场相关的过程。虽然已经对凯夫电子和快速离子诱导的这种分子系统解吸了，但众所周知，亚键电子状态相对鲜为人知。我们从150-2000-2000 EV电子能量范围内测量并量化了从分子冰系统（N $ _2 $，CO，CO $ _2 $，AR和H $ _2 $ _2 $ o/d $ _2 $ o）的测量和量化的电子刺激解吸。在这种状态下，停止功率不再足以解释ESD产量的电子能量依赖性。我们介绍了与解吸相关的深度的概念，该深度表征了表面附近的两个能量沉积状态之间的过渡。然后，我们将此概念应用于不同的系统，显示子播种机构中的ESD如何揭示晶体和多孔无定形co中物种扩散的差异。
Electron-stimulated desorption (ESD) of cryosorbed molecules on surfaces is a process of relevance to fields as varied as vacuum dynamics in accelerators and astrochemistry. While desorption from such molecular systems induced by keV electrons and fast ions has been extensively studied, the sub-keV electron regime is comparatively little known. We measured and quantified electron-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 the 150-2000 eV electron energy range. In this regime stopping power is no longer sufficient to explain the electron energy dependence of ESD yields. We introduce the notion of desorption-relevant depth, which characterizes the transition between two energy deposition regimes near the surface. We then apply this notion to the different systems, showing how ESD in the sub-keV regime can for example reveal the differences in species diffusion in crystalline and porous amorphous CO$_2$ ices.
