Dear Tod and Prof Goddard
We have been using Dreiding hydrogen bonding potential for acid-base polymer systems of our interest. In a just recently concluded runs, I observed that although Dreiding hydrogen bonding potential does produce good hydrogen bonding of interest, much better than that when such potential is not used, the diffusivity results (which are main results of practical interest) are almost same. This reminds me that Tod had once told me that one does have to check if this potential is essential. However, reading DREIDING papers, one gets the impression that whenever you have hydrogen bonded to strong electronegative atom, it is customary to include this potential. Is that always essential in the light of current example?
Thanks
Chetan