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For Collision frequency, enter a value or expression for the Collision frequency ν (SI unit: Hz). The default is 2 × 106 Hz.
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For Cross section enter a value or expression for the Collision cross section σ (SI unit: m2). The default is 3 × 10-19 m2.
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Select the Number density specification: From parent (the default) or User defined. For User defined, enter a Background number density Nd (SI unit: 1/m3). The default is 1020 1/m3. If From parent is selected, the number density is inherited from the Collisions node.
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Select the Molar mass specification: From parent (the default) or User defined. For User defined, enter the Background gas molar mass Mg (SI unit: kg/mol). The default is 0.04 kg/mol. If From parent is selected, the background gas molar mass is inherited from the Collisions node.
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