content_image/348967.jpg
<img src='content_image/348967.jpg'>

using the interpolation and extrapolation procedures described above are available with the journal’s EPAPS service and can be provided by the authors upon a request. 

## III. COMPARISON WITH PREVIOUS STUDIES 

Figures 3, 4, and 5 illustrate the comparison of the PES in Jacobi coordinates obtained in the present study with the results of Refs. [10, 11] for three values of γ =0 ° , 30 ° , and 90 ° respectively. Each figure gives the PES for one value of γ and eight values of r versus the coordinate R . The origin of potential energy yielded by the ab initio procedure corresponds 

