By the solution of Bloch's equation for the density matrix, a development is obtained suitable for the exact evaluation of the second virial coefficient near absolute zero Assuming a molecular interaction of the Lennard-Jones type, it is shown that the virial coefficient for helium is -{½(πβ)3/2+31 15πβ+O(1)}Å3, πβ=38 04/T
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H S Green (1952) studied this question.
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