Table 1.

Intermolecular distance dependence, sign of energy, additivity characteristics and per cent contribution at R corresponding to the van der Waals (vdW) minimum and for larger distances, for the most important components of the intermolecular interaction energy for polar systems (Jeziorski et al 1994, Chalasinski and Szczesniak 1994).

	R dependence	Sign	Additive?	% Contribution in vdW minimum (%)
$E_{\text{elstat}-\text{multip}}^1$	R−1, R−2, R−3, …	+/−	Yes	50–70
$E_{\text{penetr}}^1$	exp(−a R)	+	Yes	1–5
$E_{\text{exch}}^1$	exp(−a R)	+	No	5–10
$E_{\text{ind}}^2$	R−4, R−6, …	−	No (nonadditivity could be +/−)	10–20
$E_{\text{disp}}^2$	R−6, R−8, R−10, …	−	Yes	15–30
$E_{\text{disp}}^3$	R−9, …	+/−	No (nonadditivity: could be: +/−)	1–2
Various Ecorrel contributions				<5