Fig 1a: 2D representation of neutral gases randomly traveling inside a chamber. The angular travel direction of gases is equally populated in all directions depicted in the graph (Fig 1b). In Fig 1b, we show positively charged ions and a negatively biased wafer. Ions will be accelerated downwards due to the electric field; however, perfect vertical trajectories will not be achieved due to random thermal effects and collisions with other ions or gas molecules. Angular velocity distribution can be approximated as a Gaussian function (Fig. 1b).

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