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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 Th...
Themes of Aufbau Suppression in Excited-State-Specific Coupled Cluster and Perturbation Theories

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자료유형  
 학위논문 서양
최종처리일시  
20260202104843
ISBN  
9798293893300
DDC  
540
저자명  
Tuckman, Harrison Glen.
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  
Coupled cluster theory
키워드  
Electronic structure
키워드  
Excited states
키워드  
Perturbation theory
키워드  
Aufbau suppression
기타저자  
University of California, Berkeley Chemistry
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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■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.

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