Return the 1el integral
I and A are spatial indices. Follows the definition of the purple book.
The function exists to have a direct translation of the pen and paper equations into code.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| integer, | intent(in) | :: | i |
Spatial orbital indices |
||
| integer, | intent(in) | :: | a |
Spatial orbital indices |