From chemistry-request@ccl.net Sun Nov 16 22:48:41 2003 Received: from mercury.chem.pitt.edu (mercury.chem.pitt.edu [136.142.60.100]) by server.ccl.net (8.12.8/8.12.8) with ESMTP id hAH3mA9c009248 for ; Sun, 16 Nov 2003 22:48:10 -0500 Received: from ringo.chem.pitt.edu (localhost.localdomain [127.0.0.1]) by mercury.chem.pitt.edu (Postfix) with SMTP id AA3AB483D for ; Sun, 16 Nov 2003 22:45:29 -0500 (EST) Received: from 200.97.134.55 (SquirrelMail authenticated user gustavo) by mercury.chem.pitt.edu with HTTP; Sun, 16 Nov 2003 22:45:29 -0500 (EST) Message-ID: <1707.200.97.134.55.1069040729.squirrel!at!mercury.chem.pitt.edu> Date: Sun, 16 Nov 2003 22:45:29 -0500 (EST) Subject: Sum Over States with damping - another question From: To: X-Priority: 3 Importance: Normal X-Mailer: SquirrelMail (version 1.2.11) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=0.3 required=7.0 tests=NO_REAL_NAME,QUOTED_EMAIL_TEXT version=2.55 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) Dear CCL Readers, I would like modify my original question. My problem is that I am obtaining negative values for the imaginary part of gamma(-w;w,w,-w). Can someone explain the meaning of a negative value of this imaginary part? Thank you very much in advance. I will summarize if I receive any answer. Sincerely yours, Gustavo L.C. Moura gustavo!at!mercury.chem.pitt.edu > Dear CCL readers, > I am interested in doing Sum Over States calculations of > absorption of two photons. I have read several papers including > the paper by Orr and Ward in Molecular Physics 20, 513 (1971). > When comparing equation 43c from Orr and Ward with the equation > in more recent papers that cite Orr and Ward, I found different > signs in front of the damping factors (they are all negative). > My question is: can anyone explain the discrepancy in these > signs? > Thank you very much in advance. > Sincerely yours, > Gustavo L.C. Moura > gustavo!at!mercury.chem.pitt.edu