Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Spectra of W39+-W47+ in the 12 nm to 20 nm Region Observed With an EBIT Light Source



Yuri Ralchenko, Joseph Reader, Joshua M. Pomeroy, Joseph N. Tan, John D. Gillaspy


We observed spectra of highly ionized tungsten in the extreme ultraviolet with an electron beam ion trap (EBIT) and a grazing incidence spectrometer at the National Institute of Standards and Technology. Stages of ionization were distinguished by varying the energy of the electron beam between 2.1~keV and 4.3~keV and correlating the energies with spectral line emergence. The spectra were calibrated by separate spectra of highly ionized iron produced in the EBIT. Identification of the observed lines was aided by collisional-radiative modeling of the EBIT plasma. Good quantitative agreement was obtained between the modeling results and the experimental observations. Our line identifications complement recent results for W$^{40+}$-W$^{45+}$ observed in a tokamak plasma by P\{u}tterich {\it et al} (\jpb {\bf 38}, 3071, 2005). For most lines we agree with their assignment of ionization stage. Additionally, we present new identifications for some allowed and forbidden lines of W$^{39+}$, W$^{44+}$, W$^{46+}$, and W$^{47+}$. The uncertainties of our wavelengths range from 0.002 nm to 0.010 nm.
Journal of Physics B-Atomic Molecular and Optical Physics


collisional-radiative modeling, EBIT, EUV spectra, highly-charged ions, tungsten


Ralchenko, Y. , Reader, J. , Pomeroy, J. , Tan, J. and Gillaspy, J. (2007), Spectra of W<sup>39+</sup>-W<sup>47+</sup> in the 12 nm to 20 nm Region Observed With an EBIT Light Source, Journal of Physics B-Atomic Molecular and Optical Physics (Accessed May 28, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created October 14, 2007, Updated February 17, 2017