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Nonradiative energy dissipation in electronically excited polyatomicmolecules proceeds through conical intersections, loci of degeneracy betweenelectronic states. We observe a marked enhancement of laser-induced doubleionization in the vicinity of a conical intersection during a non-radiativetransition. We measured double ionization by detecting the kinetic energy ofions released by laser-induced strong-field fragmentation during thering-opening transition between 1,3-cyclohexadiene and 1,3,5-hexatriene. Theenhancement of the double ionization correlates with the conical intersectionbetween the HOMO and LUMO orbitals.

Enhancement of strong-field multiple ionization in the vicinity of the conical intersection in 1,3-cyclohexadiene ring opening