Journal article

Publication year: 2020

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Volume number: 53

Issue number: 1

ISSN: 0953-4075

eISSN: 1361-6455

Open access status: Green

DOI Link: https://doi.org/10.1088/1361-6455/ab51e9

Publisher: IOP Publishing

Abstract: 

Absolute cross sections for electron-impact single ionisation (EISI) of multiply charged tungsten ions (Wq+) with charge states in the range 11 <= q <= 18 in the electron–ion collision energy ranges from below the respective ionisation thresholds up to 1000 eV were measured employing the electron–ion crossed-beams method. In order to extend the results to higher energies, cross section calculations were performed using the subconfiguration-averaged distorted-wave (SCADW) method for electron–ion collision energies up to 150 keV. From the combined experimental and scaled theoretical cross sections rate coefficients were derived which are compared with the ones contained in the ADAS database and that are based on previous configuration-averaged distorted wave (CADW) calculations of Loch et al (2005 Phys. Rev. A 72 052716). Significant discrepancies were found at the temperatures where the ions investigated here are expected to form in collisionally ionised plasmas. These discrepancies are attributed to the limitations of the CADW approach and also the more detailed SCADW treatment which do not allow for a sufficiently accurate description of the EISI cross sections particularly at the ionisation thresholds.

Harvard Citation style: Schury, D., Borovik, A., Ebinger, B., Jin, F., Spruck, K., Müller, A., et al. (2020) Electron-impact single ionisation of Wq+ions: experiment and theory for 11 ≤ q ≤ 18, Journal of Physics B: Atomic, Molecular and Optical Physics, 53(1), Article 015201. https://doi.org/10.1088/1361-6455/ab51e9

APA Citation style: Schury, D., Borovik, A., Ebinger, B., Jin, F., Spruck, K., Müller, A., & Schippers, S. (2020). Electron-impact single ionisation of Wq+ions: experiment and theory for 11 ≤ q ≤ 18. Journal of Physics B: Atomic, Molecular and Optical Physics. 53(1), Article 015201. https://doi.org/10.1088/1361-6455/ab51e9