Orbital index conventions

Similar to Helgaker (T. Helgaker, Jørgensen, and Olsen 2000), we define the following orbital indices for the following orbital spaces

References

Helgaker, Trygve, Poul Jørgensen, and Jeppe Olsen. 2000. Molecular Electronic-Structure Theory. John Wiley & Sons, Ltd. - Chichester. https://doi.org/10.1002/9781119019572.