Subject: negative vibration frequency

From: "Hui-Hsu \(Gavin\) Tsai" <[email-masked]>
Date: Thu, 19 Jul 2001 11:31:08 -0400

Hi CCLers:

    I have a question about the negative frequency in the frequency calculation.
For larger or complicate molecule, the geometry optimization usually can not reach the minimum point, but the saddle point with some negative and small vibration frequencies. To adapt and try to reoptimize the molecule wastes CPU.
Is there any geometry optimization algorithm which can follow the negative frequency and reach the minimum point automatically?
any comment is welcome! Thanks!

Gavin