The adiabatic potential energy curves of ${\mathrm{Rb}}_2$ in the long-range Rydberg electronic states are calculated using the two-electron $R$-matrix method [M. Tarana and R. Čurík, Phys. Rev. A 95, 042515 (2017)] for the intermediate internuclear separations between 37 and 200 a.u. The results are compared with the zero-range models to find a region of the internuclear distances where Fermi's pseudopotential approach provides accurate energies. A finite-range potential model of the atomic perturber is used to calculate the wave functions of the Rydberg electron and their features specific for the studied range of internuclear distances are identified.

中文翻译：

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远程Rydberg分子Rb2：中间核间距离的双电子R矩阵计算

绝热势能曲线 $b_2$ 在远距离里德堡电子态使用双电子计算 $\mathrm{[R}$-矩阵法[M. Tarana和R.Čurík，物理学。修订版A 95，37和200之间的中间核间分离AU结果042515（2017）]与零范围机型相比以找到费米的赝方法提供准确能量的核间距的区域。使用原子扰动的有限范围电势模型来计算Rydberg电子的波函数，并确定其对于所研究核间距的特定范围的特征。