The second virial coefficient B(T) of hydrogen (H2) has been calculated at temperatures over the range 1 K to 3000 K using the Woolley potential function. The potential constants ε/k = 28,79 K, rm = 0,34473 nm, e1 = 0,01 have been determined from the B(T)‐data of Michels et al. (1959). The calculated second virial coefficients B(T) agree very well with the available experimental data over the whole temperature range from 13 K to 3000 K. A new method of calculating second virial coefficients has been suggested for low temperatures based on the representation of (y–y0)/(x–x0) vs x by a straight line (x = T1/2, y = T5/4 B).
It has been shown that the second refractivity virial coefficient bR vanishes at the Boyle temperature TB. A theory has been developed with account of change of sign of bR at TB, and analytical formulas have been derived. For the first time the temperature dependence of bR has been calculated for He at temperatures over the range 5 K to 800 K using the Woolley potential.
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