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A report is given of derivations of useful formulas for the electrostriction and the nonlinear polarization of a gas of neutral molecules in a static electric field. The derivations begin with the definitions from quantum statistical mechanics for the grand-ensemble averages of the two quantities in question, and the resulting formulas are obtained by means of the linked-diagram method of Kaufman and Watson.
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Louis T. Klauder (1967) studied this question.
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