From chemistry-request %-% at %-% ccl.net Thu Jul 7 05:28:30 2005 Received: from mx1.ustc.edu.cn ([202.38.64.1]) by server.ccl.net (8.13.1/8.13.1) with ESMTP id j679SO55031225 for ; Thu, 7 Jul 2005 05:28:25 -0400 Received: from dxl ([210.45.66.65]) by mx1.ustc.edu.cn (8.11.6/8.11.6) with SMTP id j679Npf24153; Thu, 7 Jul 2005 17:23:51 +0800 Message-Id: <200507070923.j679Npf24153-.at.-mx1.ustc.edu.cn> Date: Thu, 7 Jul 2005 17:29:33 +0800 From: "Ding Xunlei" Reply-To: dxl-.at.-ustc.edu.cn To: "chemistry" , "molpro-user" Subject: why casscf not converge in an opt calculation in molpro Organization: University of Science and Technology of China X-mailer: Foxmail 5.0 [cn] Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" X-Spam-Status: No, score=1.8 required=5.0 tests=DNS_FROM_RFC_ABUSE, DNS_FROM_RFC_WHOIS,MIME_BASE64_BLANKS,MIME_BASE64_TEXT autolearn=no version=3.0.4 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on server.ccl.net Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by server.ccl.net id j679SU55031272 Dear chemistry#: In molpro calculations with casscf, I found a puzzle. If omit the "optg" from the input file below, the casscf calculation will converge. If use the "optg", the casscf calculation will not converge. If use "frequencies" instead of "optg", the casscf calculation will also not converge. Why? **** CO2 scan r1=1.2 Ang geometry C O1 ,C, r1 O2 ,C, r1, O1,180 end gprint,basis,orbitals basis spd,c,vdz;c spd,o,vdz;c end hf casscf optg Thank you for your help! Yours sincerely, Ding Xunlei 2005-07-07 ______________________________________________