Effects of spin contamination on estimating bond dissociation energies of polycyclic aromatic hydrocarbons
Abstract
The objective of this work is to investigate the impact of spin contamination on the prediction of the enthalpies of formation of Polycyclic Aromatic Hydrocarbon (PAH) radicals and of the bond dissociation energies of their precursor molecule. These PAH radicals play a major role in the mass growth of soot precursors leading ultimately to the first soot particles. In this work, we highlights the errors due to spin contamination by comparing spin‐unrestricted open‐shell calculations (UHF, UMP2, and Quadratic CI singles and doubles [QCISD(T)]) with spin‐restricted open‐shell calculations (ROHF, ROMP2, and ROCCSD(T)). The results suggest that one should be very careful using any of the spin‐unrestricted methods (even QCISD (T)) unless the values are extremely close to the theoretical value. Following these observations, we propose a new set of best‐estimates for the enthalpies of formation of these critical PAH radicals using spin‐restricted open‐shell ROMP2 and RCCSD(T) calculations. © 2015 Wiley Periodicals, Inc.
- Authors:
-
- Mechanical and Civil Engineering Department, California Institute of Technology 1200 E. California Blvd Pasadena CA 91125
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1400908
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- International Journal of Quantum Chemistry
- Additional Journal Information:
- Journal Name: International Journal of Quantum Chemistry Journal Volume: 115 Journal Issue: 12; Journal ID: ISSN 0020-7608
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Blanquart, Guillaume. Effects of spin contamination on estimating bond dissociation energies of polycyclic aromatic hydrocarbons. United States: N. p., 2015.
Web. doi:10.1002/qua.24904.
Blanquart, Guillaume. Effects of spin contamination on estimating bond dissociation energies of polycyclic aromatic hydrocarbons. United States. https://doi.org/10.1002/qua.24904
Blanquart, Guillaume. Wed .
"Effects of spin contamination on estimating bond dissociation energies of polycyclic aromatic hydrocarbons". United States. https://doi.org/10.1002/qua.24904.
@article{osti_1400908,
title = {Effects of spin contamination on estimating bond dissociation energies of polycyclic aromatic hydrocarbons},
author = {Blanquart, Guillaume},
abstractNote = {The objective of this work is to investigate the impact of spin contamination on the prediction of the enthalpies of formation of Polycyclic Aromatic Hydrocarbon (PAH) radicals and of the bond dissociation energies of their precursor molecule. These PAH radicals play a major role in the mass growth of soot precursors leading ultimately to the first soot particles. In this work, we highlights the errors due to spin contamination by comparing spin‐unrestricted open‐shell calculations (UHF, UMP2, and Quadratic CI singles and doubles [QCISD(T)]) with spin‐restricted open‐shell calculations (ROHF, ROMP2, and ROCCSD(T)). The results suggest that one should be very careful using any of the spin‐unrestricted methods (even QCISD (T)) unless the values are extremely close to the theoretical value. Following these observations, we propose a new set of best‐estimates for the enthalpies of formation of these critical PAH radicals using spin‐restricted open‐shell ROMP2 and RCCSD(T) calculations. © 2015 Wiley Periodicals, Inc.},
doi = {10.1002/qua.24904},
journal = {International Journal of Quantum Chemistry},
number = 12,
volume = 115,
place = {United States},
year = {Wed Mar 18 00:00:00 EDT 2015},
month = {Wed Mar 18 00:00:00 EDT 2015}
}
https://doi.org/10.1002/qua.24904
Web of Science
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