Journal article

Publication year: 2021

Journal: Physical review A

Volume number: 104

Issue number: 5

ISSN: 2469-9926

eISSN: 2469-9934

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevA.104.053107

Publisher: American Physical Society

Abstract: 
Experimental cross sections for m-fold photodetachment (m = 3-6) of silicon anions via K-shell excitation and ionization were measured in the photon-energy range of 1830-1900 eV using the photon-ion merged-beams technique at a synchrotron light source. All cross sections exhibit a threshold behavior that is masked by prethreshold resonances associated with the excitation of a 1s electron to higher, either partly occupied or unoccupied atomic subshells. Results from multiconfiguration Dirac-Fock calculations agree with the experimentally derived cross sections for photoabsorption if small energy shifts are applied to the calculated resonance positions and detachment thresholds. Moreover, a systematic approach is applied for modeling the deexcitation cascades that set in after the initial creation of a K-shell hole. The resulting product charge-state distributions compare well with the measured ones for direct K-shell detachment but less well for resonant K-shell excitation. The present results are potentially useful for identifying silicon anions in cold plasmas such as interstellar gas clouds.

Harvard Citation style: Perry-Sassmannshausen, A., Buhr, T., Martins, M., Reinwardt, S., Trinter, F., Müller, A., et al. (2021) Multiple photodetachment of silicon anions via K-shell excitation and ionization, Physical review A, 104(5), Article 053107. https://doi.org/10.1103/PhysRevA.104.053107

APA Citation style: Perry-Sassmannshausen, A., Buhr, T., Martins, M., Reinwardt, S., Trinter, F., Müller, A., Fritzsche, S., & Schippers, S. (2021). Multiple photodetachment of silicon anions via K-shell excitation and ionization. Physical review A. 104(5), Article 053107. https://doi.org/10.1103/PhysRevA.104.053107