Identification of extreme-ultraviolet transitions in highly charged Zr and Mo ions

Spectroscopic measurements of highly charged highly charged Zr and Mo ions

were performed with the electron beam ion trap (EBIT) at the National Institute of

Standards and Technology and recorded with a flat-field grazing-incidence extreme-

ultraviolet spectrometer. A detailed collisional-radiative modeling was used to

identify and analyze the spectral lines in the wavelength range of 2 nm to 18 nm.

The electron beam energy was systematically varied between 4.5 keV and 12.5 keV

to selectively create different ionization stages. Reasonable agreement between the

measured spectra and the modeled spectra obtained by simulation of the non-

Maxwellian EBIT plasma was found, assisting the identification of many new lines

from Li-like to Ne-like ions. These lines arise from dominant electric as well as

magnetic-dipole transitions.