Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Wenxian Li; Zhan Shi; Yang Yang; Jun Xiao; Tomas Brage; Roger Hutton; Yaming Zou

doi:10.1103/PhysRevA.91.062501

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Tungsten spectroscopy in the EUV range observed at a high-temperature superconducting electron-beam ion trap

Wenxian Li, Zhan Shi, Yang Yang, Jun Xiao, Tomas Brage, Roger Hutton, Yaming Zou

DOI 10.1103/PhysRevA.91.062501 · Physical Review A

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Abstract

We have recorded extreme ultraviolet spectra from W11+ to W15+ ions using a flat-field spectrometer installed at the Shanghai high-temperature superconducting electron-beam ion trap. The spectra were recorded at beam energies ranging between 200 and 400 eV and showed spectral lines and transition arrays in the 170–260 Å region. The charge states and spectra transitions were identified by comparison with calculations using a detailed relativistic configuration interaction method and collisional-radiative model, both incorporated in the flexible atomic code. Atomic structure calculations showed that the dominant emission arises from 5d → 5p and 5p → 5s transitions. The work also identified the ground-state configuration of W13+ as 4f135s2 both theoretically and experimentally.