For helium-argon, Wigner-expansion corrections up to ℏ8/ℏ10 reproduce direct quantum and path-integral zeroth and first spectral moments to within 0.05% at 50-500 K, while a two-parameter desymmetrization recovers the 50 K line shape.
(52) Next, a proposal distributionρ(0) P is derived from the tar- get distribution ρP by assuming the potential U is zero
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The Use of Wigner Expansion and Path Integral Method for Quantum Correction of the Low-Order Spectral Moments and Collision-Induced Absorption Profiles
For helium-argon, Wigner-expansion corrections up to ℏ8/ℏ10 reproduce direct quantum and path-integral zeroth and first spectral moments to within 0.05% at 50-500 K, while a two-parameter desymmetrization recovers the 50 K line shape.