From owner-chemistry \\at// ccl.net Fri Feb 13 20:49:00 2009 From: "Roman D Gorbunov rgorbuno:+:aecom.yu.edu" To: CCL Subject: CCL: Hessian matrix in Cartesian coordinates by Gaussian. Message-Id: <-38614-090213204822-22708-VgvqL1QJO2061lfbZOk+Sg ~~ server.ccl.net> X-Original-From: "Roman D Gorbunov" Date: Fri, 13 Feb 2009 20:48:18 -0500 Sent to CCL by: "Roman D Gorbunov" [rgorbuno~~aecom.yu.edu] I think I found the answer on my question. In the formated checkpoint file there is a block called "Cartesian Force Constants". It should be nothing but the Hessian matrix in the Cartesian coordinates.