Tungsten spectroscopy in the EUV observed in SH-HtscEBIT

TL;DR

This study presents EUV spectra of tungsten ions W11+ to W15+ using a new spectrometer at an EBIT, identifying spectral lines and atomic structures through experimental measurements and detailed calculations.

Contribution

It provides new spectral data and atomic structure insights for tungsten ions in the EUV range, combining experimental and theoretical approaches.

Findings

Spectral lines identified in the 170-260 Å range.

Dominant emissions from 5d→5p and 5p→5s transitions.

Ground-state configuration of W13+ determined as 4f13 5s2.

Abstract

We have recorded extreme ultraviolet spectra from $\mathrm{W^{11+}}$ to $\mathrm{W^{15+}}$ ions using a new flat field spectrometer installed at the Shanghai high temperature superconducting electron beam ion trap. The spectra were recorded at beam energies ranging between 200 eV and 400 eV and showed spectral lines/transition arrays in the 170 - 260 \AA{} 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 $5d$ $\rightarrow$ $5p$ and $5p$ $\rightarrow$ $5s$ transitions. The work also identified the ground-state configuration of $W^{13+}$ as $4f^{13}5s^2$ both theoretically and experimentally.