pub fn thomas_fermi_constant() -> f64Expand description
The Thomas-Fermi constant (9 pi^2 / 128)^(1/3) = 0.8853, which multiplies
the Bohr radius in the Firsov and Lindhard lengths. The closed form is
Firsov’s (Sov. Phys. JETP 6, 534 (1958), p. 535), and the rounded value
0.8853 is the one printed by Lindhard, Scharff and Schiott (1963), p. 8.