**Figure 1.** Ground state ^{1}Σ^{+}_{g} potential energy curve of Mg_{2} as a function of internuclear separation obtained by RKR method.

RKR potential HTML table

**Figure 2.** Potential curves of the *A* ^{1}Σ_{u}^{+} - *X* ^{1}Σ_{g}^{+} system of the Mg_{2} molecule for *J* = 0 and *J* = 71.

**Figure 3.** Potential curve for Mg_{2} calculated within a basis of 56 contracted Gaussian type orbitals (the calculation of the correlation energy used 54 molecular orbitals since the 1σ_{g} and 1σ_{u} orbitals were frozen).

**Figure 4.** Comparison of theoretical and experimental (RKR) van der Waals wells for the *X* ^{1}Σ_{g}^{+} state of Mg_{2}.

Figure 5. Ground state ^{1}Σ^{+}_{g} potential energy curve of Mg_{2} as a function of internuclear separation obtained by different methods: | red line is by the RKR method; green line is by the IPA procedure; cyan line is by ;ab initio CASSCF-CASPT2 calculationblue dotted line is by the ab initio MVB calculation. |

IPA potential HTML table

Created November 2, 2015, Updated August 25, 2016