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Figure 2
(a) Schematic of the gas cell showing one of the two gas lines (inlet/outlet) and one of the two inlet cooling lines. A quartz window (not shown) separates the reaction region from the support tube, which is exposed to atmospheric pressure. (b) Metallic cap with the Si3N4 membrane at the center. (c) Cover cap electrically connected to the one in (b). A bias can be applied to it to minimize signal interference from ionization of the reactant gases. (d) Front-view picture of the cell showing the two inlet orifices for the cooling lines (red arrows) and the four outlet holes connecting to the inside of the main tube (yellow arrows). This serves also to purge the main tube of any residual gas, such as oxygen.

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