Figure 4

Contour plot of seams of conical intersections (thick blue curves) and potential energies (black curves) of \(\hbox {Na}_2\hbox {Rb}_2\) in planar \(D_{ 2h}\) symmetry as functions of separations \(R_{\mathrm{NaNa}}\) and \(R_{\mathrm{RbRb}}\). The orange marker indicates the minimum-energy conical intersection (MECI) on seam 1. The grey area indicates \(D_{2h}\) geometries that are classically accessible for a cold NaRb+NaRb collision. Figure was prepared using Grace-5.1.22 software.