Dear Netters, Could anyone tell me what the form for the Slater Exchange Functional used by Gaussian 92? Exactly what are the differences between the Slater Functional and the Xalpha functional? Any replies would be appreciated. Send reply to SBOESCH (- at -) aardvark.ucs.uoknor.edu Thanks in advance. Scott Boesch Department of Chemistry & Biochemistry University of Oklahoma