AI 中文总结
本研究通过质谱法检测晶粒碰撞释放的分子，发现碰撞会释放水等吸附物，为原行星盘摩擦电离的重要性提供了实验支持。
AI 中文摘要
晶粒带电和气体电离是原行星盘中的重要过程，二者均发生在晶粒间的相互碰撞中，碰撞时电荷在晶粒表面间交换，同时以离子形式释放到周围气体中。目前，摩擦带电的电荷载体、气态离子的起源及其组成均未知，但了解这些信息对验证盘条件下这些过程的重要性至关重要。本研究通过质谱法检测晶粒碰撞过程中 ejected 的分子，以探究这些问题。由于摩擦带电在正常大气条件下表现良好，本研究使用未处理的“脏”颗粒。无碰撞时，测量显示存在分子背景混合物，其中包括有机物，尤其是与水相关的分子。碰撞期间，并非所有分子的丰度都会发生变化，但相当一部分会变化，与水相关的分子是变化幅度最大的组分之一。这些结果表明，即使在极低压力下，颗粒碰撞也会释放吸附物，这与原行星盘相关。在原行星盘的低温至中等温度区域，所有表面都存在水和有机物的单分子层，这支持了摩擦电离在原行星盘中的重要性。
英文摘要
Grain charging and gas ionization are important processes in protoplanetary disks. Both occur in mutual collisions between grains, as charge is exchanged between grain surfaces but also released into the surrounding gas as ions. The charge carrier for tribocharging, the origin of the gaseous ions, and their composition are currently unknown. However, it is important to know to validate the significance of these processes under disk conditions. In this work, we approach these questions by detecting molecules ejected during grain collisions by mass spectrometry. As tribocharging works well under normal atmospheric conditions, we use untreated "dirty" particles here. Without collisions, our measurements show a background mix of molecules. Among these are organics, but especially water-related molecules. During collisions, the abundances of not all but quite a few molecules change. Water-related molecules account for one of the largest changing fractions. These results suggest that particle collisions release adsorbates even at very low pressure, which is relevant for protoplanetary disks. As monolayers of water and organics are present on all surfaces in cool to moderately tempered parts of protoplanetary disks, this supports the importance of triboionization in disks.
Comments4 pages, 5 figures, 1 table
Journal refhttps://www.aanda.org/articles/aa/full_html/2026/08/aa59615-26/aa59615-26.html
DOI：10.1051/0004-6361/202659615
