In a recent publication (M. Baer, A. Alijah, Chem. Phys. Lett. 319 (2000) 4
89), it is proposed that, contrary to a number of statements in the literat
ure, it may indeed be possible to construct strictly diabatic electronic ba
sis sets in molecular systems. We show that the result of Baer and Alijah i
s invalid. (C) 2000 Elsevier Science B.V. All rights reserved.