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Higher Accuracy, Lower Cost: Developments in Molecular and Periodic Electronic Structure Theory- [electronic resource]
Higher Accuracy, Lower Cost: Developments in Molecular and Periodic Electronic Structure T...
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Higher Accuracy, Lower Cost: Developments in Molecular and Periodic Electronic Structure Theory- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214100434
ISBN  
9798380380942
DDC  
542
저자명  
Rettig, Adam.
서명/저자  
Higher Accuracy, Lower Cost: Developments in Molecular and Periodic Electronic Structure Theory - [electronic resource]
발행사항  
[S.l.]: : University of California, Berkeley., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(168 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Head-Gordon, Martin.
학위논문주기  
Thesis (Ph.D.)--University of California, Berkeley, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Proper applications of electronic structure theory use the most accurate computational method that is feasible for the system size of interest. Modern electronic structure theory methods therefore seek to maximize the ratio of accuracy to computation time. To improve upon an existing method, one must therefore either increase the accuracy or lower the computational cost. In this work, we present techniques for both. In Chapter 2, we present a study of regularized orbital optimized second order Moller-Plesset theory (OOMP2) and provide an analysis of appropriate empirical parameters across a broad spectrum of chemical systems - yielding a factor of 9 reduction in error over unregularized OOMP2 for certain classes of problems! In Chapter 3, we present a new algorithm utilizing tensor hypercontraction to compute exact exchange for periodic systems including k-point sampling; this approach significantly reduces the computation time and memory usage for hybrid density functional theory (DFT) when large k-point meshes are used. In Chapter 4, we analyze the effect of orbitals in third order Moller-Plesset theory (MP3), showing that DFT orbitals can yield a factor of 3 reduction in error over the more traditional Hartree-Fock orbitals for many applications at no extra computational cost. Finally, in Chapter 5 we utilize MP3 with DFT orbitals to compute reaction energies and reaction rate constants for an experimentally observed reaction and use these to predict the product, which the experiment could only characterize by molecular weight.
일반주제명  
Computational chemistry.
일반주제명  
Chemistry.
일반주제명  
Molecular chemistry.
키워드  
Density functional theory
키워드  
Electronic structure
키워드  
Quantum chemistry
키워드  
Molecular weight
기타저자  
University of California, Berkeley Chemistry
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
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