Dynamic mapping of conical intersection seams: A general method for incorporating the geometric phase in adiabatic dynamics in polyatomic systems
The incorporation of the geometric phase in singlestate adiabatic dynamics near a conical intersection (CI) seam has so far been restricted to molecular systems with high symmetry or simple model Hamiltonians. This is due to the fact that the ab initio determined derivative coupling (DC) in a multidimensional space is not curlfree, thus making its line integral path dependent. In a recent work [C. L. Malbon et al., J. Chem. Phys. 145, 234111 (2016)], we proposed a new and general approach based on an ab initio determined diabatic representation consisting of only two electronic states, in which the DC is completely removable, so that its line integral is path independent in the simply connected domains that exclude the CI seam. Then with the CIs included, the line integral of the singlevalued DC can be used to construct the complex geometrydependent phase needed to exactly eliminate the doublevalued character of the realvalued adiabatic electronic wavefunction. This geometrydependent phase gives rise to a vector potential which, when included in the adiabatic representation, rigorously accounts for the geometric phase in a system with an arbitrary locus of the CI seam and an arbitrary number of internal coordinates. Here, we demonstrate this approach inmore »
 Authors:

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 Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry and Chemical Biology
 Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry
 Publication Date:
 Grant/Contract Number:
 SC0015997; CHE1361121
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of Chemical Physics
 Additional Journal Information:
 Journal Volume: 147; Journal Issue: 4; Journal ID: ISSN 00219606
 Publisher:
 American Institute of Physics (AIP)
 Research Org:
 Univ. of New Mexico, Albuquerque, NM (United States)
 Sponsoring Org:
 USDOE Office of Science (SC); National Science Foundation (NSF)
 Contributing Orgs:
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 74 ATOMIC AND MOLECULAR PHYSICS; quantum chemical dynamics; particle symmetry; geometric phases; photodissociation; functional equations; regression analysis; hydrogen bonding; integral calculus; diabatization; potential energy surfaces
 OSTI Identifier:
 1474044
 Alternate Identifier(s):
 OSTI ID: 1372945