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We present extreme ultraviolet laboratory spectra of highly charged S IX and S X measured using a compact electron beam ion trap. The data were recorded using a flat-field grazing incidence spectrometer in the wavelength range between 210 and 290 Å. The beam energy was tuned for three different values at 365, 410 and 465 eV while keeping electron beam current constant at 10 mA. By measuring the beam energy dependence, we identified several lines originating from S IX and S X ions with the support of collisional-radiative modeling. We compared them with the present calculations and transitions listed in the NIST data base and found in good agreement. [ABSTRACT FROM AUTHOR]

In this work we have investigated extreme ultraviolet emission spectra of highly charged xenon and barium in the wavelength range of 90–130 Å. A compact electron beam ion trap equipped with a high resolution flat-field grazing incidence spectrometer was used to record spectra. The electron beam energy was tuned at 225, 280 and 460 eV for xenon to produce Xe 8 + –Xe 11+ and at 500, 550 and 670 eV for barium to produce Ba 18 + –Ba 21+ . We compared the observed wavelength values with data available in the literature. [ABSTRACT FROM AUTHOR]

We present extreme ultraviolet spectra of highly charged Fe ions observed with a compact electron beam ion trap as a function of monoenergetic electron beam energy. For 3 s 3 p – 3 s 3 d lines in Fe XV, strong intensity enhancement at a specific electron energy is confirmed. The enhancement is assigned as the resonant excitation via dielectronic capture followed by autoionization. The resonance contribution to line intensity ratio, which is important for the diagnostics of astrophysical plasmas, is discussed. [ABSTRACT FROM AUTHOR]