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dc.contributor.advisorFrediani, Luca
dc.contributor.authorBjørgve, Magnar
dc.date.accessioned2024-03-22T12:49:51Z
dc.date.available2024-03-22T12:49:51Z
dc.date.issued2024-04-04
dc.description.abstractThis thesis presents VAMPyR, an advancement in quantum chemistry that significantly mitigates the challenges inherent in high-precision computational methods. By providing a Python interface to the multiwavelet-based functionalities of MRCPP, VAMPyR enables a more intuitive, accessible, and efficient approach to quantum chemical calculations, reducing the complexity traditionally encountered with basis sets and lower-level programming languages. The development and capabilities of VAMPyR are underscored, illustrating its application in simplifying the prototyping and implementation of new methods in quantum chemistry. The software's usability is evidenced through successful deployment in educational settings and research projects, thus confirming its potential to enhance productivity and foster innovation in the field.en_US
dc.description.abstractDenne avhandlingen presenterer VAMPyR, et fremskritt innen kvantekjemi som betydelig reduserer utfordringene som er inneboende i presise beregningsmetoder. Ved å tilby et Python-grensesnitt til multiwavelet-baserte funksjoner av MRCPP, muliggjør VAMPyR en mer intuitiv, tilgjengelig og effektiv tilnærming til kvantekjemiske beregninger, noe som reduserer kompleksiteten som tradisjonelt møtes med basissett og programmeringsspråk på lavere nivå. Utviklingen og funksjonaliteten til VAMPyR blir understreket, og illustrerer dets anvendelse i forenklingen av prototyping og implementering av nye metoder i kvantekjemi. Programmets brukervennlighet bevises gjennom vellykket bruk i utdanningsinnstillinger og forskningsprosjekter, noe som bekrefter dets potensiale til å øke produktivitet og fremme innovasjon i feltet.en_US
dc.description.doctoraltypeph.d.en_US
dc.description.popularabstractQuantum chemistry sits at the forefront of scientific innovation, revealing the secrets of molecular structures and behaviors. The MRChem group pioneers this field with cutting-edge computational methodologies designed to enhance the precision of molecular calculations. Understanding the difference between precision and accuracy is key. Analogous to throwing darts, accuracy is hitting the bullseye, whereas precision is consistently throwing darts close together, regardless of their proximity to the target. In quantum chemistry, accuracy aligns our models with the truth of Schrödinger's equation, while precision ensures that our numerical calculations are reliably reproducible. Traditional methods like atom-centered Gaussian functions pose limitations, especially where high precision is necessary. To overcome these, the MRChem group leverages a computational method that uses multiwavelets, which adapt computational effort to the complexity of the molecular region being simulated. This adaptive approach not only controls errors but also markedly enhances efficiency, as evidenced by the findings of Wind et al., which indicate potential application to larger molecular systems. At the heart of the MRChem project are three innovative tools: MRCPP, MRChem, and Vampyr. MRCPP serves as a foundation for numerical mathematics based on multi-resolution analysis. Building upon this, MRChem specializes in electronic structure calculations, poised for high-performance computing. Vampyr, the focus of this discussion, emerges as a Python interface for MRCPP, simplifying the entry into quantum chemical computing and encouraging modular prototyping. The thesis presents Vampyr not only as an advancement in computational quantum chemistry but also as a means to reduce the complexity traditionally associated with such computations. By employing Python, Vampyr mitigates the steep learning curve of complex programming and optimizes the coding process, thereby focusing on the essential challenges of quantum chemical research. The practicality of Vampyr is highlighted through its use in diverse academic projects and papers, demonstrating its versatility and user-friendliness. It also serves as an educational tool, introducing students to quantum chemistry in a manageable way. In conclusion, the MRChem project, spearheaded by its suite of computational tools led by Vampyr, represents a significant stride in precision quantum chemistry. By dismantling traditional barriers and embracing user-friendly platforms, MRChem and Vampyr not only push the boundaries of molecular understanding but also democratize the tools needed to explore this fascinating quantum realm.en_US
dc.identifier.isbn978-82-8236-572-7 (printed), 978-82-8236-573-4 (pdf).
dc.identifier.urihttps://hdl.handle.net/10037/33245
dc.language.isoengen_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.relation.haspart<p>Paper 1: Bjørgve, M., Tantardini, C., Jensen, S.R., Gerez S., G.A., Wind, P., Eikås, R.D.R., Dinvay, E. & Frediani, L. VAMPyR - A high level Python library for mathematical operations in a Multiwavelets representation. (Manuscript). <p>Paper 2: Jensen, S.R., Durdek, A., Bjørgve, M., Wind, P., Flå, T. & Frediani, L. (2023). Kinetic Energy-free Hartree-Fock equations: an integral formulation. <i>Journal of Mathematical Chemistry, 61</i>(2), 343-361. Also available in Munin at <a href=https://hdl.handle.net/10037/27428>https://hdl.handle.net/10037/27428</a>. <p>Paper 3: Tantardini, C., Eikås, R.D.R., Bjørgve, M., Jensen, S.R. & Frediani, L. Full Breit Hamiltonian in the Multiwavelets Framework. (Submitted manuscript). Now published in the <i>Journal of Chemical Theory and Computation, 20</i>(2), 882-890, available in Munin at <a href=https://hdl.handle.net/10037/32727>https://hdl.handle.net/10037/32727</a>. <p>Paper 4: Gerez S., G.A., Eikås, R.D.R., Jensen, S.R., Bjørgve, M. & Frediani, L. (2023). Cavity-free continuum solvation: implementation and parametrization in a multiwavelet framework. <i>Journal of Chemical Theory and Computation, 19</i>(7), 1986-1997. Also available in Munin at <a href=https://hdl.handle.net/10037/32429>https://hdl.handle.net/10037/32429</a>.en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)en_US
dc.subjectTeoretisk Kjemien_US
dc.subjectMultiwaveletsen_US
dc.subjectQuantum Chemistryen_US
dc.titleUnleashing the VAMPyR. A Python Journey into the Realm of Multiwavelets and Quantum Chemistyen_US
dc.typeDoctoral thesisen_US
dc.typeDoktorgradsavhandlingen_US


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