Predicting exchange coupling in molecular systems with Density Functional Theory

Tiheysfunktionaaliteoria on ottanut paikkansa vakiintuneena kvanttikemian työkaluna sen laskennallisen tehokkuutensa ansiosta verrattuna moniin aaltofunktiomenetelmiin. Molekyylimagnetismin ja vaihtokytkettyjen molekylaaristen systeemien keksimisen jälkeen tiheysfunktionaaliteoria on osoittautunut e...

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Main Author: Toivola, Juho
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Kemian laitos, Department of Chemistry, Jyväskylän yliopisto, University of Jyväskylä
Format: Master's thesis
Language:eng
Published: 2021
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/77236
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author Toivola, Juho
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Kemian laitos Department of Chemistry Jyväskylän yliopisto University of Jyväskylä
author_facet Toivola, Juho Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Kemian laitos Department of Chemistry Jyväskylän yliopisto University of Jyväskylä Toivola, Juho Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Kemian laitos Department of Chemistry Jyväskylän yliopisto University of Jyväskylä
author_sort Toivola, Juho
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description Tiheysfunktionaaliteoria on ottanut paikkansa vakiintuneena kvanttikemian työkaluna sen laskennallisen tehokkuutensa ansiosta verrattuna moniin aaltofunktiomenetelmiin. Molekyylimagnetismin ja vaihtokytkettyjen molekylaaristen systeemien keksimisen jälkeen tiheysfunktionaaliteoria on osoittautunut erinomaiseksi menetelmäksi vaihtokytkennän suuruuden ja tyypin määrittämiseen molekyylien energioiden pohjalta. Validointikokeet ovat osoittaneet, että oikea vaihtokorrelaatiofunktionaalin ja kantajoukon yhdistelmä voi tuottaa vaihtokytkentävakioita, jotka ovat lähellä kirjallisuusarvoja, vaikka eri yhdistelmien suorituskyky voikin vaihdella suuresti. Tässä työssä tarkastellaan tiheysfunktionaaliteorian ja magnetismin teoriaa keskittyen vaihtokytkentään, ja siihen, miten nykyiset tiheysfunktionaalimenetelmät onnistuvat tuottamaan tarkkoja kytkentävakioita. Density Functional Theory has become a well-established approach among modern quantum chemistry theories due to its relatively low computational cost compared to many wave function-based methods. After the introduction of molecular magnetism and exchange-coupled molecular systems, density functional theory has proven to be suitable for accurately determining the strength and type of exchange coupling based on molecular energies. In validation studies it has been shown that the right combination of exchange-correlation functional and basis set can provide exchange coupling constants that are in good agreement with experimental data, although the performance of different combinations can vary tremendously. In this work, the theory of density functional theory and magnetism are reviewed, focusing on exchange coupling and how modern density functional approaches can succeed in delivering accurate exchange coupling constants.
first_indexed 2021-08-02T20:01:32Z
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Molekyylimagnetismin ja vaihtokytkettyjen molekylaaristen systeemien keksimisen j\u00e4lkeen tiheysfunktionaaliteoria on osoittautunut erinomaiseksi menetelm\u00e4ksi vaihtokytkenn\u00e4n suuruuden ja tyypin m\u00e4\u00e4ritt\u00e4miseen molekyylien energioiden pohjalta. Validointikokeet ovat osoittaneet, ett\u00e4 oikea vaihtokorrelaatiofunktionaalin ja kantajoukon yhdistelm\u00e4 voi tuottaa vaihtokytkent\u00e4vakioita, jotka ovat l\u00e4hell\u00e4 kirjallisuusarvoja, vaikka eri yhdistelmien suorituskyky voikin vaihdella suuresti. 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spellingShingle Toivola, Juho Predicting exchange coupling in molecular systems with Density Functional Theory Nanotiede Nanoscience 4033 kvanttikemia tiheysfunktionaaliteoria magneettiset ominaisuudet molekyylit laskennallinen kemia quantum chemistry density functional theory magnetic properties molecules computational chemistry
title Predicting exchange coupling in molecular systems with Density Functional Theory
title_full Predicting exchange coupling in molecular systems with Density Functional Theory
title_fullStr Predicting exchange coupling in molecular systems with Density Functional Theory Predicting exchange coupling in molecular systems with Density Functional Theory
title_full_unstemmed Predicting exchange coupling in molecular systems with Density Functional Theory Predicting exchange coupling in molecular systems with Density Functional Theory
title_short Predicting exchange coupling in molecular systems with Density Functional Theory
title_sort predicting exchange coupling in molecular systems with density functional theory
title_txtP Predicting exchange coupling in molecular systems with Density Functional Theory
topic Nanotiede Nanoscience 4033 kvanttikemia tiheysfunktionaaliteoria magneettiset ominaisuudet molekyylit laskennallinen kemia quantum chemistry density functional theory magnetic properties molecules computational chemistry
topic_facet 4033 Nanoscience Nanotiede computational chemistry density functional theory kvanttikemia laskennallinen kemia magneettiset ominaisuudet magnetic properties molecules molekyylit quantum chemistry tiheysfunktionaaliteoria
url https://jyx.jyu.fi/handle/123456789/77236 http://www.urn.fi/URN:NBN:fi:jyu-202108024404
work_keys_str_mv AT toivolajuho predictingexchangecouplinginmolecularsystemswithdensityfunctionaltheory