SPECIFIC FEATURES OF COEXISTENCE CURVE DIAMETER NEAR CRITICAL-POINT OF HD AND QUANTUM EFFECTS

Commonly known experimental data on temperature dependence of the coexistence curve diameter near the critical point of HD is approximated by extended scaling equation with critical exponents and amplitudes as free parameters. Simultaneously critical density was defined more exactly. The best approximation corresponds to a two-term equation with the exponent of the asymptotic term for the diameter beta1 = 0.70 +/- 0.12 and the correction term beta3 almost-equal-to 2beta1. It is shown that the authors' rough estimation of the critical density may be a probable reason for the <<specific>> behavior of the HD of coexistence curve diameter related to quantum effects.