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Interstellar space hosts nanometre- to micron-sized dust grains. Thecarbonaceous-rich component of these grain populations emits in infrared bands,observed remotely for decades with telescopes and satellites. They are a keyingredient of astrochemical dust evolution. The precise carriers for most ofthese bands are still unknown and not well reproduced in the laboratory. Inthis work, we show the high-energy mechanochemical synthesis of disorderedaromatic and aliphatic analogues provides interstellar relevant dust particles.The mechanochemical milling of carbon-based solids under a hydrogen atmosphereproduces particles with a spectroscopic match to astrophysical observations ofaromatic infrared band (AIB) emission. The H/C ratio for the analogues thatbest reproduce these astronomical infrared observations lies in the 5$\pm$2%range. This value is much lower than diffuse interstellar hydrogenatedamorphous carbons, another Galactic dust grain component observed inabsorption, and it most probably provides a constraint on the hydrogenationdegree of the most aromatic carbonaceous dust grain carriers. A broad band,observed in AIBs, in the 7.4-8.3 $\mu$m range is correlated to the hydrogencontent, and thus the structural evolution in the analogues produced. Themechanochemical process can be seen as an experimental reactor to stimulatelocal energetic chemical reactions. It introduces bond disorder and hydrogenchemical attachment on the produced defects, with an effect similar to theinterstellar space very localised chemical reactions with solids. From thevantage point of astrophysics, these laboratory interstellar dust analogueswill be used to predict dust grain evolution under simulated interstellarconditions, including harsh radiative environments. Such interstellar analoguesoffer an opportunity to derive a global view on the cycling of matter in otherstar forming systems.

Mechanochemical synthesis of Aromatic Infrared Band carriers. The top-down chemistry of interstellar carbonaceous dust grain analogues