Vladimir S. Petrovic, Sebastian Schorb, Jaehee Kim, James White, James P. Cryan, J. Michael Glownia, Lucas Zipp, Douglas Broege, Shungo Miyabe, Hongli Tao, Todd Martinez, Philip H. Bucksbaum
Nonradiative energy dissipation in electronically excited polyatomic molecules proceeds through conical intersections, loci of degeneracy between electronic states. Here we demonstrate a high sensitivity of strong-field multiple ionization to conical intersections. By measuring kinetic energy of ions resulting from time-resolved strong-field fragmentation of isomerizing 1,3-cyclohexadiene, we separated out the time dependence of strong-field double ionization rate. A delayed enhancement in the double ionization rate correlates with molecular geometry corresponding to a degeneracy between the HOMO and LUMO orbitals. Strong-field multiple ionization is generally applicable to investigation of non-radiative processes.
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http://arxiv.org/abs/1212.3728
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