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A detector has been constructed for measuring ion mobilities of gas mixturesat atmospheric pressure and room temperature. The detector consists of astandard triple GEM amplification region and a drift region where ions drift. Amethod has been developed to measure the ions' arrival time at a cathodewire-grid by differentiating the recorded signals on this electrode.Simulations prove that this method is accurate and robust. The ion mobility indifferent gas mixtures is measured while applying different drift field valuesranging from 200 V cm$^{-1}$ to 1100 V cm$^{-1}$. From an extrapolation of aBlanc's law fit to measurements in Ar-CO$_2$ mixtures we find the reducedmobility of the drifting (cluster) ion species in pure argon to be$1.94\pm0.01$ cm$^{2}$ V$^{-1}$ s$^{-1}$ and in pure carbon-dioxide to be$1.10\pm0.01$ cm$^{2}$ V$^{-1}$ s$^{-1}$. Applying the same procedure to ourmeasurements in Ne-CO$_2$ yields $4.06\pm0.07$ cm$^{2}$ V$^{-1}$ s$^{-1}$ and$1.09\pm0.01$ cm$^{2}$ V$^{- 1}$ s$^{-1}$ for the reduced mobilities in pureneon and carbon-dioxide, respectively. Admixtures of N$_2$ to Ne-CO$_2$ reducesomewhat the mobility. For the baseline gas mixture of the future ALICE TimeProjection Chamber, Ne- CO$_2$-N$_{2}$ (90-10-5), the measured reduced mobilityof the drifting ions is $2.92\pm0.04$ cm$^{2}$ V$^{-1}$ s$^{-1}$. Ionmobilities are examined for different water content ranging from 70 ppm toabout 2000 ppm in the gas using Ar-CO$_2$ (90-10) and Ne-CO$_2$ (90-10). Aslight decrease of ion mobility is observed for the addition of several hundredppm of water.

Ion mobility measurements in Ar-CO$_2$, Ne-CO$_2$, and Ne-CO$_2$-N$_{2}$ mixtures, and the effect of water contents