From chemistry-request: at :server.ccl.net Fri Nov 26 15:29:59 1999 Received: from metropolis.nuclecu.unam.mx (basiuk \\at// metropolis.nuclecu.unam.mx [132.248.29.92]) by server.ccl.net (8.8.7/8.8.7) with ESMTP id PAA13106 for ; Fri, 26 Nov 1999 15:29:58 -0500 Received: from localhost (basiuk "-at-" localhost) by metropolis.nuclecu.unam.mx (8.8.7/8.8.7) with SMTP id NAA14446 for ; Fri, 26 Nov 1999 13:26:49 -0600 Date: Fri, 26 Nov 1999 13:26:49 -0600 (CST) From: Vladimir Basiuk To: chemistry -8 at 8- ccl.net Subject: TS Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Dear CCLers, Please could you help me to clarify the following point. Is the presence of one imaginary frequency the necessary and sufficient criterion to consider the structure as TS? Thank you and best regards, Vladimir *********************************************** Dr. Vladimir Basiuk Instituto de Ciencias Nucleares Universidad Nacional Autonoma de Mexico Circuito Exterior C.U. A. Postal 70-543 04510 Mexico, D.F., MEXICO Tel: (52) 56 16 27 97 (52) 56 22 46 74 Fax: (52) 56 16 22 33 email: basiuk%!at!%nuclecu.unam.mx ***********************************************