@proceedings{12899,
  author = {Vandana Sharma and Etienne Gagnon and Arvinder Sandhu and Robin Santra and Wen Li and Phay Ho and Predrag Ranitovic and Lewis Cocke and Margaret Murnane and Henry Kapteyn},
  title = {Electronic feshbach resonances created in soft x-ray-induced 02 dissociation},
  abstract = {<p>When an atom or molecule is ionized by an x-ray, super-excited states can be created that then decay, or autoionize, by ejecting a second electron from the ion. Here we find that autoionization following soft x-ray photoionization of molecular oxygen follows a complex, multi-step, process[1]. By interrupting the autoionization process using a short laser pulse, we show that autoionization cannot occur until the internuclear separation of the fragments is greater than 30 � ngstroms. As the ion and excited neutral atom separate, we directly observe the birth of a new state. We follow the transformation of electronically bound states of the molecular ion into Feshbach resonances of the neutral oxygen atom that are characterized by both positive and negative binding energies. States with negative binding energies have not been predicted or observed in neutral atoms previously.</p>
},
  year = {2009},
  journal = {Journal of Physics: Conference Series},
  volume = {194},
  number = {2},
  pages = {022071},
  month = {2009-11},
  url = {https://dx.doi.org/10.1088/1742-6596/194/2/022071},
  doi = {10.1088/1742-6596/194/2/022071},
}