The adiabatic elastic constants of single crystals of neon at 24.3 K and of argon at 82.0 K have been determined by Brillouin scattering. For argon the values are C₁₁=2.33±0.08, C₁₂=1.49±0.06, C₄₄=1.17±0.07, in units 10¹⁰ dyne/cm² with the elastic anisotropy A=2.80±0.60; for neon, the values are C₁₁=1.175±0.020, C₁₂=0.740±0.020, C₄₄=0.595±0.015, and A=2.74±0.25.
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Gewurtz et al. (1972) studied this question.
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