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Efficient calculati...
Efficient calculations of a large number of highly excited states for multiconfigurational wavefunctions
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- Delcey, Mickael G (author)
- Uppsala universitet,Teoretisk kemi
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- Sörensen, Lasse Kragh (author)
- Uppsala universitet,Teoretisk kemi
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- Vacher, Morgane (author)
- Uppsala universitet,Teoretisk kemi
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- Couto, Rafael Carvalho (author)
- Uppsala universitet,Teoretisk kemi
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- Lundberg, Marcus, 1974- (author)
- Uppsala universitet,Teoretisk kemi
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(creator_code:org_t)
- 2019-04-02
- 2019
- English.
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In: Journal of Computational Chemistry. - : Wiley. - 0192-8651 .- 1096-987X. ; 40:19, s. 1789-1799
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https://doi.org/10.1...
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Abstract
Subject headings
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- Electronically excited states play important roles in many chemical reactions and spectroscopic techniques. In quantum chemistry, a common technique to solve excited states is the multiroot Davidson algorithm, but it is not designed for processes like X-ray spectroscopy that involves hundreds of highly excited states. We show how the use of a restricted active space wavefunction together with a projection operator to remove low-lying electronic states offers an efficient way to reach single and double-core-hole states. Additionally, several improvements to the stability and efficiency of the configuration interaction (CI) algorithm for a large number of states are suggested. When applied to a series of transition metal complexes the new CI algorithm does not only resolve divergence issues but also leads to typical reduction in computational time by 70%, with the largest savings for small molecules and large active spaces. Together, the projection operator and the improved CI algorithm now make it possible to simulate a wide range of single- and two-photon spectroscopies.
Subject headings
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Keyword
- configuration interaction
- excited states
- X-ray spectroscopy
- multiconfigurational wavefunction
- computational cost
Publication and Content Type
- ref (subject category)
- art (subject category)
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