Pople basis sets in NWChem 6.6

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My difference was actually using an auxiliary code I have written that grabs basis set information from the src/basis/libraries files, and the python script I used was originally written about 2007. I have been relying on the "cartesian" or "spherical" tags included in those files for each atomic basis, and noticed they have changed for some basis sets between 6.5 and 6.6.

The particular changes I noted were for the 6-31G* basis sets for C and S, where the unused cartesian/spherical tag changed from "cartesian" in 6.5 (denoting the actual implementation of polarization functions) to "spherical" in 6.6 (denoting who knows what). Looking at current NWChem documentation, I see the current version does not use that tag and changing it in the libraries/ files makes no difference on direct nwchem calculations, although I am curious why the text files for the basis sets were changed. Or if they were changed intentionally, why not just remove the tag so that the current text files do not incorrectly label some of the basis sets with the wrong polarization tag.

Thanks anyway, John Mintmire

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