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Composite Quantum Chemical Methods With Improved Accuracy and Efficiency: New Developments and Applications to the Study of Optical Properties of Materials
Composite Quantum Chemical Methods With Improved Accuracy and Efficiency: New Developments...
Composite Quantum Chemical Methods With Improved Accuracy and Efficiency: New Developments and Applications to the Study of Optical Properties of Materials

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자료유형  
 학위논문 서양
최종처리일시  
20250211151034
ISBN  
9798381977806
DDC  
542
저자명  
Tripathy, Vikrant.
서명/저자  
Composite Quantum Chemical Methods With Improved Accuracy and Efficiency: New Developments and Applications to the Study of Optical Properties of Materials
발행사항  
[Sl] : Indiana University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
248 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-10, Section: B.
주기사항  
Advisor: Raghavachari, Krishnan.
학위논문주기  
Thesis (Ph.D.)--Indiana University, 2024.
초록/해제  
요약The computational cost of accurate in silico simulation of chemical properties of molecular systems grows rapidly with system size, often resulting in conflict between cost and accuracy for practical applications. Composite models are contemporary approaches designed to circumvent this issue by approximating the computationally expensive calculation on a full molecule using a combination of computationally cheaper calculations. We have developed new composite methods based on two popular frameworks in computational quantum chemistry, ONIOM (hybrid active site model) and MIM (fragmentation model). We have developed a new method (EE-ONIOM-CT) which simultaneously corrects for two major deficiencies (electrostatic embedding and charge redistribution) of the ONIOM method. Additionally, we have formulated the complex but efficient analytic gradients of both ONIOM-CT and EE-ONIOM-CT to facilitate the study of reaction dynamics. We have also developed an electrostatically embedded version of the fragmentation method Molecules-In-Molecules (MIM), called EE-MIM, with improved performance as demonstrated by applications to molecular clusters. Further, we have extended the domain of application of MIM to non-equilibrium structures and studies of bond dissociation.SMILES materials have enabled seamless transfer of solution optical phenomena to the solid state. To facilitate the design of such advanced optical materials, it is critical to perform accurate and rapid calculations on electronic excited states (absorption and emission) of dye molecules and their associated complexes. Unlike the ground state, the prediction of excited state properties using QM methods is still not well-optimized. We have implemented an efficient version of a ∆-SCF method, IMOM, including correction for triplet contamination, to optimize this process. In our work, we have demonstrated that IMOM can be used as a black-box method in accurately predicting emission maxima of a large variety of dye molecules. Further, we have used the computationally efficient analytic gradients of IMOM to enable accelerated screening of candidate dye molecules.
일반주제명  
Computational chemistry
일반주제명  
Physical chemistry
일반주제명  
Chemistry
일반주제명  
Optics
일반주제명  
Molecular chemistry
키워드  
Analytic gradients
키워드  
Computer aided design
키워드  
Electrostatic embedding
키워드  
Fragmentation methods
키워드  
ONIOM
키워드  
Optical property
기타저자  
Indiana University Chemistry
기본자료저록  
Dissertations Abstracts International. 85-10B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI30997488
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a542
■1001  ▼aTripathy,  Vikrant.▼0(orcid)0000-0002-3246-0680
■24510▼aComposite  Quantum  Chemical  Methods  With  Improved  Accuracy  and  Efficiency:  New  Developments  and  Applications  to  the  Study  of  Optical  Properties  of  Materials
■260    ▼a[Sl]▼bIndiana  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a248  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-10,  Section:  B.
■500    ▼aAdvisor:  Raghavachari,  Krishnan.
■5021  ▼aThesis  (Ph.D.)--Indiana  University,  2024.
■520    ▼aThe  computational  cost  of  accurate  in  silico  simulation  of  chemical  properties  of  molecular  systems  grows  rapidly  with  system  size,  often  resulting  in  conflict  between  cost  and  accuracy  for  practical  applications.  Composite  models  are  contemporary  approaches  designed  to  circumvent  this  issue  by  approximating  the  computationally  expensive  calculation  on  a  full  molecule  using  a  combination  of  computationally  cheaper  calculations.  We  have  developed  new  composite  methods  based  on  two  popular  frameworks  in  computational  quantum  chemistry,  ONIOM  (hybrid  active  site  model)  and  MIM  (fragmentation  model).  We  have  developed  a  new  method  (EE-ONIOM-CT)  which  simultaneously  corrects  for  two  major  deficiencies  (electrostatic  embedding  and  charge  redistribution)  of  the  ONIOM  method.  Additionally,  we  have  formulated  the  complex  but  efficient  analytic  gradients  of  both  ONIOM-CT  and  EE-ONIOM-CT  to  facilitate  the  study  of  reaction  dynamics.  We  have  also  developed  an  electrostatically  embedded  version  of  the  fragmentation  method  Molecules-In-Molecules  (MIM),  called  EE-MIM,  with  improved  performance  as  demonstrated  by  applications  to  molecular  clusters.  Further,  we  have  extended  the  domain  of  application  of  MIM  to  non-equilibrium  structures  and  studies  of  bond  dissociation.SMILES  materials  have  enabled  seamless  transfer  of  solution  optical  phenomena  to  the  solid  state.  To  facilitate  the  design  of  such  advanced  optical  materials,  it  is  critical  to  perform  accurate  and  rapid  calculations  on  electronic  excited  states  (absorption  and  emission)  of  dye  molecules  and  their  associated  complexes.  Unlike  the  ground  state,  the  prediction  of  excited  state properties  using  QM  methods  is  still  not  well-optimized.  We  have  implemented  an  efficient  version  of  a  ∆-SCF  method,  IMOM,  including  correction  for  triplet  contamination,  to  optimize  this  process.  In  our  work,  we  have  demonstrated  that  IMOM  can  be  used  as  a  black-box  method  in  accurately  predicting  emission  maxima  of  a  large  variety  of  dye  molecules.  Further,  we  have  used  the  computationally  efficient  analytic  gradients  of  IMOM  to  enable  accelerated  screening  of  candidate  dye  molecules.
■590    ▼aSchool  code:  0093.
■650  4▼aComputational  chemistry
■650  4▼aPhysical  chemistry
■650  4▼aChemistry
■650  4▼aOptics
■650  4▼aMolecular  chemistry
■653    ▼aAnalytic  gradients
■653    ▼aComputer  aided  design
■653    ▼aElectrostatic  embedding
■653    ▼aFragmentation  methods
■653    ▼aONIOM
■653    ▼aOptical  property
■690    ▼a0219
■690    ▼a0494
■690    ▼a0485
■690    ▼a0752
■690    ▼a0431
■71020▼aIndiana  University▼bChemistry.
■7730  ▼tDissertations  Abstracts  International▼g85-10B.
■790    ▼a0093
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160526▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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