镁橄榄石（010）中天体物理相关分子的热解吸
Thermal desorption of astrophysically relevant molecules from forsterite(010)
摘要：
我们提出了程序升温脱附（TPD）测量CO，CH $_4$，O $_2$和CO $_2$从镁橄榄石（010）表面的亚单层和多层覆盖制度。在CO、CH $_4$和O $_2$的情况下，多层生长在单层峰饱和之前开始，导致两个明显可区分的解吸峰。另一方面，观察到CO $_2$的单一峰，该峰从低覆盖率下的高温转变为高覆盖率下的低温，在多层形成时变得尖锐。在多层覆盖范围内的所有分子的前缘对齐，表明零级解吸。我们已经提取了这些分子的多层脱附能量，使用Arrhenius分析。对于亚单层覆盖，我们观察到一个扩展的解吸尾部到更高的温度。反演分析已被用来提取的覆盖依赖的解吸能在亚单层覆盖制度，从我们得到的解吸能分布。我们发现，由于存在多个吸附能网站上的晶体表面上的这些小分子的典型的解吸能显着大于在以前的测量中获得的其他几个基板。因此，与结晶硅酸盐表面结合的分子在解吸进入气相之前可以保持锁定在固态较长时间。
英文摘要：
We present temperature programmed desorption (TPD) measurements of CO, CH$_4$, O$_2$ and CO$_2$ from the forsterite(010) surface in the sub-monolayer and multilayer coverage regimes. In the case of CO, CH$_4$ and O$_2$, multilayer growth begins prior to saturation of the monolayer peak, resulting in two clearly distinguishable desorption peaks. On the other hand a single peak for CO$_2$ is observed which shifts from high temperature at low coverage to low temperature at high coverages, sharpening upon multilayer formation. The leading edges are aligned for all the molecules in the multilayer coverage regime indicating zero order desorption. We have extracted multilayer desorption energies for these molecules using an Arrhenius analysis. For sub-monolayer coverages, we observe an extended desorption tail to higher temperature. Inversion analysis has been used to extract the coverage dependent desorption energies in the sub-monolayer coverage regime, from which we obtain the desorption energy distribution. We found that owing to the presence of multiple adsorption energy sites on the crystalline surface the typical desorption energies of these small molecules are significantly larger than obtained in previous measurements for several other substrates. Therefore molecules bound to crystalline silicate surfaces may remain locked in the solid state for a longer period of time before desorption into the gas phase.
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