Abstract
We report on new measurements of -fold photodetachment () of carbon anions via -shell excitation and ionization. The experiments were carried out employing the photon-ion merged-beams technique at a synchrotron light source. While previous measurements were restricted to double detachment () and to just the lowest-energy -shell resonance at about 282 eV, our absolute experimental -fold detachment cross sections at photon energies of up to 1000 eV exhibit a wealth of new thresholds and resonances. We tentatively identify these features with the aid of detailed atomic-structure calculations. In particular, we find unambiguous evidence for fivefold detachment via double -hole production.
- Received 9 December 2019
- Accepted 29 January 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.083203
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