Multiple photodetachment of carbon anions via single and double core-hole creation

TL;DR

This study presents new measurements of multiple photodetachment processes in carbon anions, revealing numerous thresholds and resonances up to 1000 eV, including clear evidence for fivefold detachment via double K-hole creation.

Contribution

It provides the first comprehensive experimental data on m-fold photodetachment of carbon anions at high photon energies, expanding understanding of core-hole related detachment mechanisms.

Findings

Identification of new thresholds and resonances up to 1000 eV

Experimental evidence for fivefold detachment via double K-hole production

Enhanced atomic-structure understanding of carbon anion photodetachment

Abstract

We report on new measurements of m-fold photodetachment (m=2-5) of carbon anions via K-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 (m=2) and to just the lowest-energy K-shell resonance at about 282 eV, our absolute experimental $m$-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 K-hole production.