Fig. 2

Schematic representation of the integrated column density measurement in the experiment and dimensions used in Eqs. (1)–(5). The gas (on the left) is in contact with the ice film (in blue). The clathration proceeds through the boundary (δ0), and the bulk clathration and diffusion evolves with time over the length L. The red line illustrates a snapshot of the clathrate concentration progression in the ice film. The infrared beam (red cylinder) probes the column density of clathrates formed in the entire film at a given time.
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