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Title: Assessment of Gaussian-3 and density functional theories for a larger experimental test set

Abstract

The G2/97 test set [J. Chem. Phys. 106, 1063 (1997)] for assessing quantum chemical methods used to predict thermochemical data is expanded to include 75 additional enthalpies of formation of larger molecules. This new set, referred to as the G3/99 test set, includes enthalpies of formation, ionization potentials, electron affinities, and proton affinities in the G2/97 set and 75 new enthalpies of formation. The total number of energies in the G3/99 set is 376. Overall, G3 theory has a mean absolute deviation of 1.07 kcal/mol for the G3/99 test set and does about as well for the new hydrocarbons and substituted hydrocarbons as it does for those in the G2/97 test. However, G3 theory has large deviations for several of the new nonhydrogen systems in the G3/99 test set such as SF{sub 6} and PF{sub 5}. Part of the source of error is traced to the inadequate geometries used in G3 theory for these molecules. Other variations of G3 theory are also assessed such as G3(MP2), G3(MP3), and the versions of G3 theory using scaled energy terms instead of the higher level correction. These variations also do well for the larger hydrocarbons and substituted hydrocarbons, but fail for the samemore » nonhydrogen systems as G3 theory. The density functional methods assessed in this study, including the hybrid B3LYP method, all have much larger deviations from experiment for the new enthalpies of formation in the expanded test set; the mean absolute deviation more than doubles compared to that for the enthalpies in the G2/97 test set. This is due to a cumulative effect of the errors in the larger molecules in the density functional methods. (c) 2000 American Institute of Physics.« less

Authors:
 [1];  [2];  [1];  [3]
  1. Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
  3. Department of Chemistry, Northwestern University, Evanston, Illinois 60208 (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
20216007
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 112; Journal Issue: 17; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRONIC STRUCTURE; THERMOCHEMICAL PROCESSES; FORMATION FREE ENTHALPY; IONIZATION POTENTIAL; FORMATION HEAT; AFFINITY; HYDROCARBONS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Curtiss, Larry A., Raghavachari, Krishnan, Redfern, Paul C., and Pople, John A. Assessment of Gaussian-3 and density functional theories for a larger experimental test set. United States: N. p., 2000. Web. doi:10.1063/1.481336.
Curtiss, Larry A., Raghavachari, Krishnan, Redfern, Paul C., & Pople, John A. Assessment of Gaussian-3 and density functional theories for a larger experimental test set. United States. doi:10.1063/1.481336.
Curtiss, Larry A., Raghavachari, Krishnan, Redfern, Paul C., and Pople, John A. Mon . "Assessment of Gaussian-3 and density functional theories for a larger experimental test set". United States. doi:10.1063/1.481336.
@article{osti_20216007,
title = {Assessment of Gaussian-3 and density functional theories for a larger experimental test set},
author = {Curtiss, Larry A. and Raghavachari, Krishnan and Redfern, Paul C. and Pople, John A.},
abstractNote = {The G2/97 test set [J. Chem. Phys. 106, 1063 (1997)] for assessing quantum chemical methods used to predict thermochemical data is expanded to include 75 additional enthalpies of formation of larger molecules. This new set, referred to as the G3/99 test set, includes enthalpies of formation, ionization potentials, electron affinities, and proton affinities in the G2/97 set and 75 new enthalpies of formation. The total number of energies in the G3/99 set is 376. Overall, G3 theory has a mean absolute deviation of 1.07 kcal/mol for the G3/99 test set and does about as well for the new hydrocarbons and substituted hydrocarbons as it does for those in the G2/97 test. However, G3 theory has large deviations for several of the new nonhydrogen systems in the G3/99 test set such as SF{sub 6} and PF{sub 5}. Part of the source of error is traced to the inadequate geometries used in G3 theory for these molecules. Other variations of G3 theory are also assessed such as G3(MP2), G3(MP3), and the versions of G3 theory using scaled energy terms instead of the higher level correction. These variations also do well for the larger hydrocarbons and substituted hydrocarbons, but fail for the same nonhydrogen systems as G3 theory. The density functional methods assessed in this study, including the hybrid B3LYP method, all have much larger deviations from experiment for the new enthalpies of formation in the expanded test set; the mean absolute deviation more than doubles compared to that for the enthalpies in the G2/97 test set. This is due to a cumulative effect of the errors in the larger molecules in the density functional methods. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.481336},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 17,
volume = 112,
place = {United States},
year = {2000},
month = {5}
}