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Complex organic molecules (COMs) have been identified toward high- andlow-mass protostars as well as molecular clouds, suggesting that theseinterstellar species originate from the early stage(s) of starformation. Thereaction pathways resulting in COMs described by the formula C$_2$H$_\text{n}$Oare still under debate. In this work, we investigate the laboratory possiblesolid-state reactions that involve simple hydrocarbons and OH-radicals alongwith H$_2$O ice under translucent cloud conditions (1$\leq$A$_V$$\leq$5 and\textit{n}$_\text{H}$$\sim$10$^3$ cm$^{-3}$). We focus on the interactions ofC$_2$H$_2$ with H-atoms and OH-radicals, which are produced along the H$_2$Oformation sequence on grain surfaces at 10 K. Ultra-high vacuum (UHV)experiments were performed to study the surface chemistry observed duringC$_2$H$_2$ + O$_2$ + H codeposition, where O$_2$ was used for the in-situgeneration of OH-radicals. Reflection absorption infrared spectroscopy (RAIRS)was applied to in situ monitor the initial and newly formed species. Afterthat, a temperature-programmed desorption experiment combined with a Quadrupolemass spectrometer (TPD-QMS) was used as a complementary analytical tool. Theinvestigated 10 K surface chemistry of C$_2$H$_2$ with H-atoms and OH-radicalsnot only results in semi and fully saturated hydrocarbons, such as ethylene(C$_2$H$_4$) and ethane (C$_2$H$_6$), but it also leads to the formation ofCOMs, such as vinyl alcohol, acetaldehyde, ketene, ethanol, and possibly aceticacid. It is concluded that OH-radical addition reactions to C$_2$H$_2$, actingas a molecular backbone, followed by isomerization (i.e., keto-enoltautomerization) via an intermolecular pathway and successive hydrogenationprovides a so far experimentally unreported solid-state route for the formationof these species without the need of energetic input.

Formation of complex molecules in translucent clouds: Acetaldehyde, vinyl alcohol, ketene, and ethanol via nonenergetic processing of C2H2 ice