A gradient optimization procedure has been used to calculate equilibrium geometries for several small molecules in the framework of ab initio molecular orbital theory. The gradient method was found to be faster and more reliable than two direcl search procedures.
On the ab initio geometry optimization of molecular solutes
β Scribed by Rosanna Bonaccorsi; Roberto Cammi; Jacopo Tomasi
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 917 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
We present several variants of methods for the automatic search of optimum geometries of solutes via ab initio SCF procedures. The physical meaning of geometry optimization in solution is discussed. Advantages and disadvantages of the different variants are shown making use of calculations on the HF dimer with different basis sets, supplemented by information on the computational times. Suggestions for the most convenient strategies (which in part depend on the nature of the solute) are also done.
π SIMILAR VOLUMES
Geometry optimizations being still very time-consumin s, methods are imrstigated to sa%e time .tt least in spcci.d cases. The Hellmzutn-Fejnmzm force is reconsidered as 3x1 approximation to the energy gradrent .md is found useful for the first few iterations of a Fometry optimization for molecules h
## Abstract A webβinterface for geometry optimization of large molecules using a linear scaling method, i.e., cardinality guided molecular tailoring approach (CGβMTA), is presented. CGβMTA is a cutβandβstitch, fragmentationβbased method developed in our laboratory, for linear scaling of conventiona