Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra
Variants of the family of the recently developed Multireference Equation of Motion Coupled Cluster (MR-EOM-CC) approaches are applied to the atomic excitation spectra of the first-row transition metals, for which experimental data are readily available. The first part of my research is to apply MR-E...
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University of Waterloo
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ftunivwaterloo:oai:uwspace.uwaterloo.ca:10012/9381 2023-05-15T17:53:37+02:00 Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra Liu, Zhebing 2015 http://hdl.handle.net/10012/9381 en eng University of Waterloo http://hdl.handle.net/10012/9381 MR-EOM benchmark Chemistry Master Thesis 2015 ftunivwaterloo 2022-06-18T23:00:25Z Variants of the family of the recently developed Multireference Equation of Motion Coupled Cluster (MR-EOM-CC) approaches are applied to the atomic excitation spectra of the first-row transition metals, for which experimental data are readily available. The first part of my research is to apply MR-EOM-CC approaches to the atomic excitation spectra of the neutral and the +1 and +2 Cr, Mn, Fe and Co atoms using ACESII program. Scalar relativistic effects are considered but spin-orbit coupling is not included. The computational results are compared to J-averaged experimental values and the errors are typically below 0.1 eV. The second part of this project is to combine MR-EOM approach with a simple treatment of spin-orbit coupling and the resulting MR-EOM-CC-SOC approach can be used to the atomic excitation spectra and the splitings in each L-S multiplet of the Cr, Mn, Fe and Co neutral atoms using the ORCA program. The errors of the spin-orbit calculations in the ORCA program are somewhat larger compared to the J-averaged calculations run in ACESII program and this is still under investigation. From both parts of this research, one can easily find that upon introducing additional cluster operators T, S, X, D and U in different variations of MR-EOM, the dimension of the final diagonalization space is greatly reduced, the overall cost of the calculation is significantly reduced, and finally, the accuracy of the calculations is, perhaps surprisingly, improved. Master Thesis Orca University of Waterloo, Canada: Institutional Repository |
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Open Polar |
collection |
University of Waterloo, Canada: Institutional Repository |
op_collection_id |
ftunivwaterloo |
language |
English |
topic |
MR-EOM benchmark Chemistry |
spellingShingle |
MR-EOM benchmark Chemistry Liu, Zhebing Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
topic_facet |
MR-EOM benchmark Chemistry |
description |
Variants of the family of the recently developed Multireference Equation of Motion Coupled Cluster (MR-EOM-CC) approaches are applied to the atomic excitation spectra of the first-row transition metals, for which experimental data are readily available. The first part of my research is to apply MR-EOM-CC approaches to the atomic excitation spectra of the neutral and the +1 and +2 Cr, Mn, Fe and Co atoms using ACESII program. Scalar relativistic effects are considered but spin-orbit coupling is not included. The computational results are compared to J-averaged experimental values and the errors are typically below 0.1 eV. The second part of this project is to combine MR-EOM approach with a simple treatment of spin-orbit coupling and the resulting MR-EOM-CC-SOC approach can be used to the atomic excitation spectra and the splitings in each L-S multiplet of the Cr, Mn, Fe and Co neutral atoms using the ORCA program. The errors of the spin-orbit calculations in the ORCA program are somewhat larger compared to the J-averaged calculations run in ACESII program and this is still under investigation. From both parts of this research, one can easily find that upon introducing additional cluster operators T, S, X, D and U in different variations of MR-EOM, the dimension of the final diagonalization space is greatly reduced, the overall cost of the calculation is significantly reduced, and finally, the accuracy of the calculations is, perhaps surprisingly, improved. |
format |
Master Thesis |
author |
Liu, Zhebing |
author_facet |
Liu, Zhebing |
author_sort |
Liu, Zhebing |
title |
Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
title_short |
Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
title_full |
Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
title_fullStr |
Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
title_full_unstemmed |
Multireference Equation of Motion Coupled Cluster Study of Atomic Excitation Apectra |
title_sort |
multireference equation of motion coupled cluster study of atomic excitation apectra |
publisher |
University of Waterloo |
publishDate |
2015 |
url |
http://hdl.handle.net/10012/9381 |
genre |
Orca |
genre_facet |
Orca |
op_relation |
http://hdl.handle.net/10012/9381 |
_version_ |
1766161315801333760 |