Efficiency of non-thermal desorptions in cold-core conditions

Under cold conditions in dense cores, gas-phase molecules and atoms are depleted from the to surface of interstellar grains. Considering time scales physical within these a portion has be brought back into explain their observation by milimeter telescopes. We tested respective efficiencies different mechanisms commonly included models. also addition sputtering ice grain mantles via collision with cosmic rays electronic stopping power regime. The induced been added Nautilus gas-grain model while other processes were already present. Each on 1D structure determined observations TMC1 cores. resulting chemical was compared methanol abundances observed found that all species not sensitive same way non-thermal desorption mechanisms, sensitivity depends conditions. Thus, it is mandatory include them. Chemical seems essential reproducing for H densities smaller than $4\times 10^4$~cm$^{-3}$, whereas above this density. models are, however, systematically below abundances. A more efficient could better reproduce observations. In conclusion, ices cosmic-rays collisions may most mechanism at high density (a few $10^4$~cm$^{-3}$ under studied here) still required densities. Additional works needed both assess efficiency respect main composition.