Jones A P
Institut d'Astrophysique Spatiale, CNRS , Univ. Paris-Sud, Université Paris-Saclay , Bât. 121, 91405 Orsay cedex, France.
R Soc Open Sci. 2016 Dec 14;3(12):160224. doi: 10.1098/rsos.160224. eCollection 2016 Dec.
Within the framework of (THEMIS), this work explores the surface processes and chemistry relating to core/mantle interstellar and cometary grain structures and their influence on the nature of these fascinating particles. It appears that a realistic consideration of the nature and chemical reactivity of interstellar grain surfaces could self-consistently and within a coherent framework explain: the anomalous oxygen depletion, the nature of the CO dark gas, the formation of 'polar ice' mantles, the red wing on the 3 μm water ice band, the basis for the O-rich chemistry observed in hot cores, the origin of organic nano-globules and the 3.2 μm 'carbonyl' absorption band observed in comet reflectance spectra. It is proposed that the reaction of gas phase species with carbonaceous a-C(:H) grain surfaces in the interstellar medium, in particular the incorporation of atomic oxygen into grain surfaces in epoxide functional groups, is the key to explaining these observations. Thus, the chemistry of cosmic dust is much more intimately related with that of the interstellar gas than has previously been considered. The current models for interstellar gas and dust chemistry will therefore most likely need to be fundamentally modified to include these new grain surface processes.
在（THEMIS）框架内，这项工作探索了与地核/地幔星际和彗星颗粒结构相关的表面过程和化学性质，以及它们对这些迷人颗粒性质的影响。看来，对星际颗粒表面的性质和化学反应性进行现实的考虑，可以在一个连贯的框架内自洽地解释：异常的氧消耗、CO暗气体的性质、“极地冰”幔的形成、3微米水冰带的红翼、在热核中观察到的富氧化学的基础、有机纳米球的起源以及在彗星反射光谱中观察到的3.2微米“羰基”吸收带。有人提出，星际介质中气相物质与含碳a-C(:H)颗粒表面的反应，特别是原子氧在环氧化物官能团中并入颗粒表面，是解释这些观测结果的关键。因此，宇宙尘埃的化学性质与星际气体的化学性质比以前认为的更为密切相关。因此，目前的星际气体和尘埃化学模型很可能需要从根本上进行修改，以纳入这些新的颗粒表面过程。
