α₁ — exponent of φ₁
0.50
α₂ — exponent of φ₂
0.50
d — separation (bohr)
2.0
p = α₁+α₂ =
—
P = product centre =
—
bohr
K = exp(−α₁α₂d²/p) =
—
S = N₁N₂(π/p)^(3/2)K =
—