Table 2.

Comparison of water dimers

Model	rOO (Å)	–ΔE (kJ/mol)
TIP3P [10]	2.76	27.2
TIP4P [10]	2.75	26.1
TIP5P [10]	2.68	28.4
POL5/TZ [44]	2.90	20.8
TIP4P/FQ [45]	2.92	18.8
Amoeba [46]	2.89	20.8
LEWIS	2.88	25.9
MP2 [43]	2.91	20.5
Experiment	2.98 [40]	22.8 [47]

non-polarizable models tend have shorter dimers to improve liquid state properties [48]