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                 Gets Around 
                
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		                        | 10:32:03 PM PDT - Sun, Sep 20th 2015  | 
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		                        Hi! 
 
Yes, we do. 
We should use ECP and valence basis set in proper combination as described in http://www.nwchem-sw.org/index.php/Release64:AvailableBasisSets#Gaussian_basis_sets_with_E... 
 
It is worth noting that in some bases (LANL2DZ) ECPs have not been defined for light elements (H - Ne) and the all-electron basis used instead. 
Also it makes sense in some cases to use pseudo-potential for hydrogen with 0 core electrons.  
http://arxiv.org/pdf/0909.5503.pdf 
 
some docs about http://www.nwchem-sw.org/index.php/Release65:ECP 
 
with respect Vladimir
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		Edited On 10:37:21 PM PDT - Sun, Sep 20th 2015 by Vladimir
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