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Accurate modeling of physical and chemical processes in the interstellarmedium requires detailed knowledge of how atoms and molecule adsorb on dustgrains. However, the sticking coefficient, a number between 0 and 1 thatmeasures the first step in the interaction of a particle with a surface, isusually assumed in simulations of ISM environments to be either 0.5 or 1. Herewe report on the determination of the sticking coefficient of H$_2$, D$_2$,N$_2$, O$_2$, CO, CH$_4$, and CO$_2$ on non-porous amorphous solid water(np-ASW). The sticking coefficient was measured over a wide range of surfacetemperatures using a highly collimated molecular beam. We showed that thestandard way of measuring the sticking coefficient --- the King-Wells method--- leads to the underestimation of trapping events in which there isincomplete energy accommodation of the molecule on the surface. Surfacescattering experiments with the use of a pulsed molecular beam are used insteadto measure the sticking coefficient. Based on the values of the measuredsticking coefficient we suggest a useful general formula of the stickingcoefficient as a function of grain temperature and molecule-surface bindingenergy. We use this formula in a simulation of ISM gas-grain chemistry to findthe effect of sticking on the abundance of key molecules both on grains and inthe gas-phase.

Sticking of molecules on non-porous amorphous water ice