From owner-chemistry \\at// ccl.net Mon Aug 22 06:44:00 2016 From: "Ahmed S Abo Dena ahmed_said5899]-[yahoo.com" To: CCL Subject: CCL:G: Computational chemistry problem Message-Id: <-52352-160822010612-16844-9/BO6zVaZTSJV6IXPsFC1g[*]server.ccl.net> X-Original-From: "Ahmed S Abo Dena" Date: Mon, 22 Aug 2016 01:06:11 -0400 Sent to CCL by: "Ahmed S Abo Dena" [ahmed_said5899]=[yahoo.com] I am working with a c.T. complex on Gaussian 09 now. The resulting TDDFT transitions do not match the experimental ones. The question is: should I use the same basis set and functional for both optimization and TDDFT calculations? When I changed the functional the results were very similar to the experimental results. Thank you. Ahmed E-mail: Ahmed_said5899*_*yahoo.com Cairo Univerity