Accurate Born-Oppenheimer potential for HeH+

Details Accurate Born-Oppenheimer potential for HeH+ Accurate Born-Oppenheimer potential for HeH+

2012-03-18

arxiv.org/abs/1203.3927v1

Physics

Chemical Physics

7 pages

Scientific paper

We demonstrate high accuracy calculations for the HeH$^+$ molecule using newly developed analytic formulas for two-center two-electron integrals with exponential functions. The Born-Oppenheimer potential for the ground electronic $^1\Sigma^+$ state is obtained in the range of 0.1 -- 60 au with precision of about $10^{-12}$ au. As an example at the equilibrium distance $r=1.463\,283$ au the Born-Oppenheimer potential amounts to $-2.978\,708\,310\,771(1)$. Obtained results lay the ground for theoretical predictions in HeH$^+$ with spectroscopic precision.

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