Local Field Approximation for the Ion in the low pressure ICP(Inductively Coupled Plasma)

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I have two questions about the LFA(Local field approximation) to calculate the ion temperature in the plasma module.

In LFA, I can determine the mobility by the polarizability through the Dalgarno model.

In here, the polarizability is the valuable which depends on the electric field like p/E (p: dipole moment, E: electric field), therefore I don't understand what polarzability of the electric field should be plugged.

Is there a representative electric field in here? such as the 1V/m so on...

Thank you!



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