indicate that, regardless of whether EOM-EA/SF or EOM-IP was used, including diffuse functions in the basis set does have an effect on the β() values. However, once such diffuse functions are added, the calculations are not very sensitive to the details of how many diffuse functions are added. For example, the less diffuse aug-cc-pVQZ+2s2p1d1f1g basis set and the more diffuse augcc-pVTZ+5s5p5d5f give essentially the same results. This leaves us with the second hypothesis.