Speaker
Description
Using the electron-ion crossed-beams technique, we have measured absolute cross sections for electron-impact single ionization of Xe$^{12+}$ and Xe$^{13+}$ ions, and double ionization of Xe$^{12+}$, Xe$^{13+}$, and Xe$^{14+}$ ions. In addition we have performed corresponding calculations using a hybrid level-to-level and subconfiguration-average distorted wave approach. We find excellent agreement between our experimental and theoretical data except near the double-ionization threshold.
We present new experimental and theoretical cross sections for electron-impact single ionization of Xe$^{12+}$ and Xe$^{13+}$ ions, and double ionization of Xe$^{12+}$, Xe$^{13+}$, and Xe$^{14+}$ ions [1]. The experiments were carried out by using the electron-ion crossed beams method with a recently commissioned electron gun, which extends our range of accessible electron energies from previously 1000 eV to now 3500 eV [3].
The calculations employed quantum mechanical perturbation theory in a hybrid approach [3,4], which augments fully-relativistic subconfiguration-averaged distorted-wave (SCADW) calculations with the more involved level-to-level distorted wave (LLDW) method for configurations straddling the ionization threshold. In the single-ionization calculations, we considered direct ionization (DI), excitation autoionization (EA), and resonant excitation double-autoionization (REDA), and, in the double ionization calculations, ionization autoionization (IA) and excitation double-autoionization (EDA). We find that, unlike in previous work [5,6], our theoretical cross sections agree with our experimental ones within the experimental uncertainties, except for the near-threshold double-ionization cross sections. We attribute this remaining discrepancy to the neglect of direct-double ionization in the present theoretical treatment.
References
[1] Jin F et al. 2024 Eur. Phys. J. D 78 68
[2] Ebinger B et al. 2017 Nucl. Instrum. Methods B
408 317
[3] Jin F et al. 2020 J. Phys. B 53 175201
[4] Jin F et al. 2020 J. Phys. B 53 175201
[5] Pindzola M S et al. 2013 J. Phys. B 46 215202
[6] Borovik Jr. Aet al. 2015 J. Phys. B 48 035203
