High-resolution x-ray spectra from molybdenum ions in the Alcator-Ctokamak

Abstract

We report on measurements of the x-ray line emission in the wavelength region $\lambda =4.3-5.3\mathrm{}$ Å from molybdenum in charge states between 28+ and 32+. The experimental results were compared with calculated line spectra (also presented) which facilitated the identification of many of the principal $2p-3d$, $2s-3p$, and $2p-3s$ transitions. Some indications of weaker satellite-line contributions were also found. The principal $2p-3d$ transitions were found to be the dominant ones. In particular, ${\mathrm{Mo}}^{32+}$ gave stronger contributions than other charge states for our plasma condition of $T_e=1.0-1.5\mathrm{}$ keV while available calculations of relative ion abundances have predicted ${\mathrm{Mo}}^{32+}$ to be relatively strongest at $T_e=2.5-3.0\mathrm{}$ keV.