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000186127 0247_ $$2doi$$a10.1103/PhysRevA.89.013403
000186127 0247_ $$2ISSN$$a0556-2791
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000186127 1001_ $$0P:(DE-HGF)0$$aGaire, B.$$b0$$eCorresponding Author
000186127 245__ $$aPhoto-double-ionization of ethylene and acetylene near threshold
000186127 260__ $$aCollege Park, Md.$$bAPS$$c2014
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000186127 520__ $$aWe present kinematically complete measurements of the photo-double-ionization of ethylene (double CC bond) and acetylene (triple CC bond) hydrocarbons just above the double-ionization threshold. We discuss the results in terms of the coincident kinetic energy of the photoelectrons and the nuclear kinetic-energy release of the recoiling ions. We have incorporated quantum chemistry calculations to interpret which of the electronic states of the dication have been populated and trace the various subsequent fragmentation channels. We suggest pathways that involve the electronic ground and excited states of the precursor ethylene dication and explore the strong influence of the conical intersections between the different electronic states. The nondissociative ionization yield is small in ethylene and high in acetylene when compared with the dissociative ionization channels. The reason for such a striking difference is explained in part on the basis of a propensity rule that influences the population of states in the photo-double-ionization of a centrosymmetric closed-shell molecule by favoring singlet ungerade and triplet gerade final states. This propensity rule and the calculated potential-energy surfaces clarify a picture of the dynamics leading to the observed dication dissociation products.
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000186127 7001_ $$0P:(DE-HGF)0$$aLee, S. Y.$$b1
000186127 7001_ $$0P:(DE-HGF)0$$aHaxton, D. J.$$b2
000186127 7001_ $$0P:(DE-HGF)0$$aPelz, P. M.$$b3
000186127 7001_ $$0P:(DE-HGF)0$$aBocharova, I.$$b4
000186127 7001_ $$0P:(DE-HGF)0$$aSturm, F. P.$$b5
000186127 7001_ $$0P:(DE-HGF)0$$aGehrken, N.$$b6
000186127 7001_ $$0P:(DE-HGF)0$$aHonig, M.$$b7
000186127 7001_ $$0P:(DE-HGF)0$$aPitzer, M.$$b8
000186127 7001_ $$0P:(DE-HGF)0$$aMetz, D.$$b9
000186127 7001_ $$0P:(DE-HGF)0$$aKim, H.-K.$$b10
000186127 7001_ $$0P:(DE-HGF)0$$aSchöffler, M.$$b11
000186127 7001_ $$0P:(DE-HGF)0$$aDörner, R.$$b12
000186127 7001_ $$0P:(DE-HGF)0$$aGassert, H.$$b13
000186127 7001_ $$0P:(DE-HGF)0$$aZeller, S.$$b14
000186127 7001_ $$0P:(DE-HGF)0$$aVoigtsberger, J.$$b15
000186127 7001_ $$0P:(DE-HGF)0$$aCao, W.$$b16
000186127 7001_ $$0P:(DE-HGF)0$$aZohrabi, M.$$b17
000186127 7001_ $$0P:(DE-HGF)0$$aWilliams, J.$$b18
000186127 7001_ $$0P:(DE-HGF)0$$aGatton, A.$$b19
000186127 7001_ $$0P:(DE-HGF)0$$aReedy, D.$$b20
000186127 7001_ $$0P:(DE-HGF)0$$aNook, C.$$b21
000186127 7001_ $$0P:(DE-Juel1)132204$$aMueller, Thomas$$b22
000186127 7001_ $$0P:(DE-HGF)0$$aLanders, A. L.$$b23
000186127 7001_ $$0P:(DE-HGF)0$$aCocke, C. L.$$b24
000186127 7001_ $$0P:(DE-HGF)0$$aBen-Itzhak, I.$$b25
000186127 7001_ $$0P:(DE-HGF)0$$aJahnke, T.$$b26
000186127 7001_ $$0P:(DE-HGF)0$$aBelkacem, A.$$b27
000186127 7001_ $$0P:(DE-HGF)0$$aWeber, Th.$$b28
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