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Ice chemistry in the dense, cold interstellar medium (ISM) is probablyresponsible for the formation of interstellar complex organic molecules (COMs).Recent laboratory experiments performed at T=4 K have shown that irradiation ofCO:N2 ice samples analog to the CO-rich interstellar ice layer can contributeto the formation of COMs when H2 molecules are present. We have tested thisorganic chemistry under a broader range of conditions relevant to the interiorof dense clouds by irradiating CO:15N2:H2 ice samples with 2 keV electrons inthe 4-15 K temperature range. The H2 ice abundance depended on both, the iceformation temperature and the thermal evolution of the samples. Formation ofH-bearing organics such as formaldehyde (H2CO), ketene (C2H2O), and isocyanicacid (H15NCO) was observed upon irradiation of ice samples formed attemperatures up to 10 K, and also in ices formed at 6 K and subsequently warmedup and irradiated at temperatures up to 15 K. These results suggest that afraction of the H2 molecules in dense cloud interiors might be entrapped in theCO-rich layer of interstellar ice mantles, and that energetic processing ofthis layer could entail an additional contribution to the formation of COMs inthe coldest regions of the ISM.

Organic chemistry in the H2-bearing, CO-rich interstellar ice layer at temperatures relevant to dense cloud interiors