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Themes of Aufbau Suppression in Excited-State-Specific Coupled Cluster and Perturbation Theories
Themes of Aufbau Suppression in Excited-State-Specific Coupled Cluster and Perturbation Theories
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104843
- ISBN
- 9798293893300
- DDC
- 540
- 서명/저자
- Themes of Aufbau Suppression in Excited-State-Specific Coupled Cluster and Perturbation Theories
- 발행사항
- [Sl] : University of California, Berkeley, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 153 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Neuscamman, Eric.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2025.
- 초록/해제
- 요약Many categories of electronically excited states remain challenging for traditional electronic structure methods. Modeling charge transfer excitations in particular requires treatment of post-excitation orbital relaxation effects which are difficult to incorporate with linear response methods. Therefore, this work introduces Aufbau suppressed coupled cluster theory, an excited-state-specific coupled cluster ansatz which tailors its correlation treatment directly for an excited state of interest. Through the introduction of an Aufbau suppressing deexcitation operator, excited states can be targeted directly while maintaining much of the same framework utilized in ground state coupled cluster theory. In particular, this approach maintains the systematic improvability, size extensivity, size consistency, an N6 scaling, and a single reference framework paradigmatic of the ground state coupled cluster theory. Furthermore, this approach can be motivated from a perturbative perspective, allowing for improvements in accuracy via a partial linearization of key terms. Ultimately, this results in an accuracy comparable to similar cost equation-of-motion coupled cluster theory on simple valence and Rydberg states, but a notable 0.25 eV average improvement on charge transfer states resulting in average errors less than 0.1 eV for these traditionally challenging states. Moreover, the same perturbative insights also yield cost-cutting approximations which maintain the accuracy of the full approach while reducing costs to non-iterative N5 , thereby enabling study of systems containing up to 100 atoms and 800 basis functions in its pilot implementation.
- 일반주제명
- Chemistry
- 일반주제명
- Computational chemistry
- 일반주제명
- Physical chemistry
- 키워드
- Excited states
- 기타저자
- University of California, Berkeley Chemistry
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798293893300
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aTuckman, Harrison Glen.
■24510▼aThemes of Aufbau Suppression in Excited-State-Specific Coupled Cluster and Perturbation Theories
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a153 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Neuscamman, Eric.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2025.
■520 ▼aMany categories of electronically excited states remain challenging for traditional electronic structure methods. Modeling charge transfer excitations in particular requires treatment of post-excitation orbital relaxation effects which are difficult to incorporate with linear response methods. Therefore, this work introduces Aufbau suppressed coupled cluster theory, an excited-state-specific coupled cluster ansatz which tailors its correlation treatment directly for an excited state of interest. Through the introduction of an Aufbau suppressing deexcitation operator, excited states can be targeted directly while maintaining much of the same framework utilized in ground state coupled cluster theory. In particular, this approach maintains the systematic improvability, size extensivity, size consistency, an N6 scaling, and a single reference framework paradigmatic of the ground state coupled cluster theory. Furthermore, this approach can be motivated from a perturbative perspective, allowing for improvements in accuracy via a partial linearization of key terms. Ultimately, this results in an accuracy comparable to similar cost equation-of-motion coupled cluster theory on simple valence and Rydberg states, but a notable 0.25 eV average improvement on charge transfer states resulting in average errors less than 0.1 eV for these traditionally challenging states. Moreover, the same perturbative insights also yield cost-cutting approximations which maintain the accuracy of the full approach while reducing costs to non-iterative N5 , thereby enabling study of systems containing up to 100 atoms and 800 basis functions in its pilot implementation.
■590 ▼aSchool code: 0028.
■650 4▼aChemistry
■650 4▼aComputational chemistry
■650 4▼aPhysical chemistry
■653 ▼aCoupled cluster theory
■653 ▼aElectronic structure
■653 ▼aExcited states
■653 ▼aPerturbation theory
■653 ▼aAufbau suppression
■690 ▼a0485
■690 ▼a0219
■690 ▼a0494
■71020▼aUniversity of California, Berkeley▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359162▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


