Time evolution of the abundances with respect to solid-state water of HNCO (solid line), HNCHO (dotted line) and NH2CHO (dashed line) in a dense molecular cloud where solid HNCO density is arbitrarily fixed to be 5% of solid H2O density at 3 × 105 years (arrow). No OCN− is produced from the HNCO + H2O thermal reaction at 10 K and OCN− density is zero all the time. Almost all HNCO is consumed in hydrogenation reactions toward HNCHO and NH2CHO, whose increases in density are directly correlated to HNCO decrease. In addition to add 5% of HNCO compared to the solid H2O density, H and H2 are reduced by 6 orders of magnitude (dot-dashed line): the HNCO abundance is only slightly decreasing. Inset: zoom of the evolution of the different abundances after t = 3 × 105 years.
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