Density dependence of the forbidden lines in Ni-like tungsten

Abstract

The magnetic-octupole (M3) and electric-quadrupole (E2) transitions between the ground state $3d^{10} ^1S_0$ and the lowest excited $3d^{9}4s$ $(5/2,1/2)$ J = 3 and J = 2 states in the Ni-like tungsten are shown to exhibit a strong dependence on electron density $N_e$ in the range of values typical for tokamak plasmas. Remarkably, the total intensity of these overlapping lines remains almost constant, which may explain the strong emission in the 7.93 Åline observed in tokamak experiments (Neu R et al. 1997 J Phys B {\bf 30} 5057). Utilization of the M3 and E2 line ratios for density diagnostics in high-spectral-resolution experiments is discussed as well.

arXiv comment8 pages, 3 figures, 1 table

References in corpus (2)

• Accelerated Recombination due to Resonant Deexcitation of Metastable States
• Multipole (E1, M1, E2, M2, E3, M3) transition wavelengths and rates between 3l5l' excited and ground states in nickel-like ions

Cited by in corpus (7)

• EUV spectra of highly-charged ions W${}^{54+}$-W${}^{63+}$ relevant to ITER diagnostics
• Spectroscopy of diagnostically-important magnetic-dipole lines in highly-charged 3d${}^n$ ions of tungsten
• Spectra of W${}^{39+}$-W${}^{47+}$ in the 12 nm to 20 nm region observed with an EBIT light source
• EUV magnetic-dipole lines from highly-charged high-Z ions with an open 3d shell
• Coronal lines and the importance of deep core-valence correlation in Ag-like ions
• Observation of Electric Octupole Emission Lines Strongly Enhanced by an Anomalous Behavior of Cascading Contribution
• Infrared and visible laser spectroscopy for highly-charged Ni-like ions