Journal
JOURNAL OF COMPUTATIONAL CHEMISTRY
Volume 23, Issue 5, Pages 576-583Publisher
WILEY
DOI: 10.1002/jcc.10054
Keywords
saddle point search; reduced gradient following; analytic gradients for excited states; H2CO; acetylene
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The implementation of the reduced gradient following (RGF) method into the COLUMBUS quantum-chemical program system is reported using the newly developed analytic MR-CISD/AQCC gradient feature. By this combination a very useful too] has been developed for general searches of stationary points on ground- and excited-state energy surfaces. This procedure is applied to the S-0 surface of H2CO and the T-1 and T-2 surfaces of acetylene. For H2CO we investigated three minima (formaldehyde, s-trans, and s-cis hydroxycarbene) and five saddle points. For the T, and T. states of acetylene the cis- and trans-minima and the planar and nonplanar saddle points were computed. (C) 2002 Wiley Periodicals, Inc.
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