SEARCH Articles Figures Tables Conical intersections two-state systems Electronic states, adiabatic-to-diabatic transformation, two-state system Exact Ground State of One- and Two-Dimensional Frustrated Quantum Spin Systems Non-adiabatic coupling two-state molecular system Quantization two-state system Superposition states two-atom systems Two-state Two-state molecular system, non-adiabatic Two-state molecular system, non-adiabatic C2H-molecule: conical Two-state molecular system, non-adiabatic Herzberg-Longuet-Higgins phase Two-state molecular system, non-adiabatic intersections Two-state molecular system, non-adiabatic quantization Two-state molecular system, non-adiabatic single conical intersection solution Two-state molecular system, non-adiabatic systems Two-state molecular system, non-adiabatic transformation matrices