2024
DOI: 10.1021/acs.jctc.4c00326
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Optimizing Conical Intersections without Explicit Use of Non-Adiabatic Couplings

Juan Sanz García,
Rosa Maskri,
Alexander Mitrushchenkov
et al.

Abstract: We present two alternative methods for optimizing minimum energy conical intersection (MECI) molecular geometries without knowledge of the derivative coupling (DC). These methods are based on the utilization of Lagrange multipliers: (i) one method uses an approximate calculation of the DC, while the other (ii) do not require the DC. Both methods use the fact that information on the DC is contained in the Hessian of the squared energy difference. Tests done on a set of small molecular systems, in comparison wit… Show more

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