Boggio-Pasqua, M.; Martin J. Paterson, Michael A. Robb, Lluís Blancafort, and Anthony D. DeBellis (J. Phys. Chem. A; 2005; 109(33) pp 7527 - 7537)
DOI: 0.1021/jp051108+

Cartoon of a "classic" double cone conical intersection showing the excited state reaction path and two ground state reaction paths

Ref: "Intramolecular Charge Transfer in 4-Aminobenzonitriles Does Not Necessarily Need the Twist" Gomez, I.; Reguero, M.; Boggio-Pasqua, M.; Robb, M. A.(J. Am. Chem. Soc.; (Article); 2005; 127(19); 7119-7129.)

DOI: 10.1021/ja042413w

A cartoon showing the conical intersection hyperline traced out by a co-ordinate X3 . The system remains degenerate as one traverses the co-ordinate X3 , but the energy and the shape of double-cone must change in X1 X2.

Ref: "Mechanism of an Exceptional Class of Photostabilizers: A Seam of Conical Intersection Parallel to Excited State Intramolecular Proton Transfer (ESIPT) in o-Hydroxyphenyl-(1,3,5)-triazine" Boggio-Pasqua, M.; Martin J. Paterson, Michael A. Robb, Lluís Blancafort, and Anthony D. DeBellis (J. Phys. Chem. A; 2005; 109(33) pp 7527 - 7537)

DOI: 0.1021/jp051108+

The conical intersection hyperline traced out by a co-ordinate X3 plotted in space containing the co-ordinate x3 and one co-ordinate from the degeneracy-lifting space x1 x2.

Ref: "The curvature of the conical intersection seam: An approximate second-order analysis" Paterson MJ, Bearpark MJ, Robb MA, Blancafort L (JOURNAL OF CHEMICAL PHYSICS 121 (23): 11562-11571 DEC 15 2004)

DOI: 10.1063/1.1813436

Schematic of the seam of intersection in the C3H3 radical. The coordinates are the gradient difference (e' in D3h symmetry) and the symmetric out-of-plane bending vibration (a2'' in D3h symmetry). Both of these coordinates combine in a curvilinear manner to produce the seam shown in red.

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