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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 and Applications to the Study of Optical Properties of Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151034
- ISBN
- 9798381977806
- DDC
- 542
- 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
- 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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■020 ▼a9798381977806
■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.


