Reducing the Computational Cost of Ab Initio Methods

Reducing the Computational Cost of Ab Initio Methods

Date: August 2008
Creator: Mintz, Benjamin
Description: In recent years, advances in computer technology combined with new ab initio computational methods have allowed for dramatic improvement in the prediction of energetic properties. Unfortunately, even with these advances, the extensive computational cost, in terms of computer time, memory, and disk space of the sophisticated methods required to achieve chemical accuracy - defined as 1 kcal/mol from reliable experimental data effectively - limits the size of molecules [i.e. less than 10-15 non-hydrogen atoms] that can be studied. Several schemes were explored to help reduce the computational cost while still maintaining chemical accuracy. Specifically, a study was performed to assess the accuracy of ccCA to compute atomization energies, ionization potentials, electron affinities, proton affinities, and enthalpies of formation for third-row (Ga-Kr) containing molecules. Next, truncation of the correlation consistent basis sets for the hydrogen atom was examined as a possible means to reduce the computational cost of ab initio methods. It was determined that energetic properties could be extrapolated to the complete basis set (CBS) limit utilizing a series of truncated hydrogen basis sets that was within 1 kcal/mol of the extrapolation of the full correlation consistent basis sets. Basis set truncation for the hydrogen atom was then applied to ...
Contributing Partner: UNT Libraries
Application of the Correlation Consistent Composite Approach (ccCA) to Third-Row (Ga-Kr) Molecules

Application of the Correlation Consistent Composite Approach (ccCA) to Third-Row (Ga-Kr) Molecules

Date: January 19, 2008
Creator: DeYonker, Nathan J.; Mintz, Benjamin; Cundari, Thomas R., 1964- & Wilson, Angela K.
Description: Article on the application of the correlation consistent composite approach (ccCA) to third-row (Ga-Kr) molecules.
Contributing Partner: UNT College of Arts and Sciences
The correlation-consistent composite approach: Application to the G3/99 test set

The correlation-consistent composite approach: Application to the G3/99 test set

Date: September 13, 2006
Creator: DeYonker, Nathan J.; Grimes, Thomas V.; Yockel, Scott; Dinescu, Adriana; Mintz, Benjamin; Cundari, Thomas R., 1964- et al.
Description: Article discussing research on the correlation consistent composite approach (ccCA) and an application to the G3/99 test set.
Contributing Partner: UNT College of Arts and Sciences