Speaker
Description
Electron autodetachment of negative ions is a known phenomenon at the picosecond and shorter time scales. Examples are shape or Feshbach resonances observed in electron scattering. However, experimenters have observed autodetaching phenomena in longer time scales. These observations have not been independently confirmed because of the
difficulty of isolating negative ions and, because radiative decay on the nanosecond scale is difficult to measure from an ion beam. In this work, we present two conceptually new methods to engage the study of metastable states of negative ions. A theoretical method that is based on discretized pseudospectra under the analytic continuation
of Green's function of the Fano-Feshbach formalism and, a experimental method based on the time-dependent extension of the solutions to the fraction-equilibrium equations for the electron detachment cross sections. Results on H$^-$, O$^-$ and O$_2^-$ will
be presented.
| Email address | hinojosa@icf.unam.mx |
|---|---|
| Funding Agency | UNAM-PAPIIT-IN100426, SECIHTI-CF-2023-I-918. |
| Visitor's Visa | yes |
| Classification | Fundamental processes and modelling |
| Footnote | Phys. Rev. A 112, 052823 (2025), J. Phys. B: At. Mol. Opt. Phys. 54 (2021). |