Unified Microscopic-Macroscopic Monte Carlo Simulations of Complex Organic Molecule Chemistry in Cold Cores

摘要: The recent discovery of methyl formate and dimethyl ether in the gas phase cold cores with temperatures as 10 K challenges our previous astrochemical models concerning formation complex organic molecules. strong correlation between abundances distributions further shows that current may be missing important chemical processes astronomical sources. We investigate a scenario which molecules methoxy radical can formed on dust grains via so-called "chain reaction" mechanism, similar manner to CO$_2$. A unified gas-grain microscopic-macroscopic Monte Carlo approach both normal interstitial sites for icy grain mantles is used perform simulations. Reactive desorption varying degrees efficiency included enhance non-thermal species grains. In addition, surface are also included. observed variety reproduced models. explained. Non-diffusive reactions surfaces play key role some