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. 2023 Feb 3;19(4):1177–1185. doi: 10.1021/acs.jctc.2c00902

Table 2. Comparison of the Dispersion Energy in the CCPP2 Approximation with Other Methods for the Helium Dimer, for the Internuclear Separation of 5.6 a0a.

correction energy
Edisp(20) –17.067
Edisp(2)(TDHF) –20.924
Edisp(2)(2) –21.354
Edisp(2)(CCD+ST(CCD)) –21.816
Edisp(2)(FCI) –22.278
Edisp(2)(CCPP2(T)) –21.903
a

The energy unit is Kelvin (1 hartree = 315775.02 K).