From chemistry-request-!at!-server.ccl.net Wed Feb 20 12:42:07 2002 Received: from mbx.unige.ch ([129.194.8.72]) by server.ccl.net (8.11.6/8.11.0) with ESMTP id g1KHg6528745 for ; Wed, 20 Feb 2002 12:42:07 -0500 Received: from CONVERSION-DAEMON.mbx.unige.ch by mbx.unige.ch (PMDF V6.0-025 #38753) id <0GRU00L01EHLH5 /at\mbx.unige.ch> for chemistry /at\ccl.net; Wed, 20 Feb 2002 18:41:45 +0100 (MET) Received: from localhost (lnx2.unige.ch [129.194.8.93]) by mbx.unige.ch (PMDF V6.0-025 #38753) with ESMTP id <0GRU00IQ0EHLUX.,at,.mbx.unige.ch> for chemistry.,at,.ccl.net; Wed, 20 Feb 2002 18:41:45 +0100 (MET) Received: from 138.37.52.177 ( [138.37.52.177]) as user boulet /at\mbox.unige.ch by webmail.unige.ch with HTTP; Wed, 20 Feb 2002 18:41:44 +0100 Date: Wed, 20 Feb 2002 18:41:44 +0100 From: Pascal.Boulet {*at*} chiphy.unige.ch Subject: Fwd: for ccl: Fermi and Coulomb holes X-Originating-IP: 138.37.52.177 To: chemistry $#at#$ ccl.net Message-id: <1014226904.3c73dfd8ed6eb -x- at -x- webmail.unige.ch> MIME-version: 1.0 Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 8BIT User-Agent: Internet Messaging Program (IMP) 3.0 X-Comment: This message was scanned against viruses by mbx.unige.ch. Dear CCL'ers, Recently, I've been asked a question about the difference between the Coulomb hole and the Fermi hole. Could someone give me an answer? Thanks in advance, Pascal ----- Forwarded message from Stephen Stackhouse ----- Date: Wed, 20 Feb 2002 17:14:39 +0000 From: Stephen Stackhouse Reply-To: Stephen Stackhouse Subject: for ccl To: Pascal Boulet Pascal, Here is my question: I have recently been reading "A Chemist's Guide to Density Functional Theory". On page 26 of the book the authors discuss the Fermi hole in terms of pair density and state that "Usually the exchange hole is largest around the probe electron." Can anyone tell me why this is so? Why is it not largest at the reference electron, like the Coulomb hole? Stephen ----- End forwarded message -----