Abstract

We present a review of measurements and analyses of extreme-ultraviolet magnetic-dipole (M1) lines in 50–60 times ionized atoms of tungsten, hafnium, tantalum and gold with an open 3d shell. The spectra were measured with the electron beam ion trap at the National Institute of Standards and Technology. Large-scale collisional–radiative modeling was instrumental in line identification and in analysis of their diagnostic potential. The M1 line ratios are shown to be an accurate and versatile tool for studying the LMN dielectronic resonances in 3dn ions.

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