The spin-flip variant of the algebraic-diagrammatic construction yields the correct topology of S1/S0 conical intersections

While the conventional variants of the algebraic-diagrammatic construction (ADC) scheme for the polarization propagator are generally incapable of correctly describing the topology of S1/S0 conical intersections (CIs), its corresponding spin-flip (SF) variant of third-order ADC (ADC(3)) is herein de...

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Hauptverfasser: Lefrancois, Daniel (VerfasserIn) , Dreuw, Andreas (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: July 25, 2017
In: Journal of chemical theory and computation
Year: 2017, Jahrgang: 13, Heft: 9, Pages: 4436-4441
ISSN:1549-9626
DOI:10.1021/acs.jctc.7b00634
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1021/acs.jctc.7b00634
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Verfasserangaben:Daniel Lefrancois, Deniz Tuna, Todd J. Martínez, and Andreas Dreuw

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520 |a While the conventional variants of the algebraic-diagrammatic construction (ADC) scheme for the polarization propagator are generally incapable of correctly describing the topology of S1/S0 conical intersections (CIs), its corresponding spin-flip (SF) variant of third-order ADC (ADC(3)) is herein demonstrated to successfully reproduce the S1/S0 minimum-energy CI (MECI) of twisted formaldinium (H2C═NH2+). Analytical nuclear excited-state gradients of ADC have been used in combination with the CIOpt program for the optimization of the MECI without the need for nonadiabatic-coupling vectors. For comparison, MS-CASPT2 calculations were performed via conventional CI optimization employing analytical nonadiabatic-coupling vectors. It is shown that SF-ADC(3) yields the correct dimensionality of the CI and overall compares very favorably to the MS-CASPT2 results. 
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