Photo-Double-Ionization of Ethylene and Acetylene near Threshold. Gaire, B., Lee, S. Y., Haxton, D. J., Pelz, P. M., Bocharova, I., Sturm, F. P., Gehrken, N., Honig, M., Pitzer, M., Metz, D., Kim, H., Schöffler, M., Dörner, R., Gassert, H., Zeller, S., Voigtsberger, J., Cao, W., Zohrabi, M., Williams, J., Gatton, a., Reedy, D., Nook, C., Müller, T., Landers, a. L., Cocke, C. L., Ben-Itzhak, I., Jahnke, T., Belkacem, a., & Weber, T. Phys. Rev. A, 89(1):013403, January, 2014. 00001
doi  abstract   bibtex   
We 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.
@article{Gaire2014,
  title = {Photo-Double-Ionization of Ethylene and Acetylene near Threshold},
  volume = {89},
  issn = {1050-2947},
  doi = {10.1103/PhysRevA.89.013403},
  abstract = {We 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.},
  timestamp = {2017-01-01T18:07:14Z},
  number = {1},
  journal = {Phys. Rev. A},
  author = {Gaire, B. and Lee, S. Y. and Haxton, D. J. and Pelz, P. M. and Bocharova, I. and Sturm, F. P. and Gehrken, N. and Honig, M. and Pitzer, M. and Metz, D. and Kim, H.-K. and Sch{\"o}ffler, M. and D{\"o}rner, R. and Gassert, H. and Zeller, S. and Voigtsberger, J. and Cao, W. and Zohrabi, M. and Williams, J. and Gatton, a. and Reedy, D. and Nook, C. and M{\"u}ller, Thomas and Landers, a. L. and Cocke, C. L. and Ben-Itzhak, I. and Jahnke, T. and Belkacem, a. and Weber, Th.},
  month = jan,
  year = {2014},
  note = {00001},
  keywords = {my papers},
  pages = {013403},
  file = {Gaire et al_2014_Photo-double-ionization of ethylene and acetylene near threshold.pdf:/mnt/B6505569505530FB/Users/Philipp/Dropbox/mpapers/Gaire et al_2014_Photo-double-ionization of ethylene and acetylene near threshold.pdf:application/pdf}
}

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