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Mass Absorption Coefficient of Tungsten and Tantalum, 1450 eV to 2350 eV: Experiment, Theory, and Application



Zachary H. Levine, S Grantham, Charles S. Tarrio, D Paterson, I McNulty, T M. Levin, A L. Ankudinov, J J. Rehr


The mass absorption coefficient of tungsten and tantalum was measured with soft x-ray photons from 1450 eV to 2350 eV using an undulator source. This includes the M3, M4, and M5 absorption edges. X-ray absorption fine structure was calculated within a real-space multiple scattering formalism; the predicted structure was observed for tungsten and to a lesser degree tantalum as well.Separately, the effects of dynamic screening were observed as shown by an atomic calculation within the relativistic time-dependent local-density approximation.Dynamic screening effects influence the spectra at the 25 % level and are observed for both tungsten and tantalum. We applied these results to characterize spatially-resolved spectra of a tungsten integrated circuit interconnect obtained using a scanning transmission x-ray microscope. The results indicate tungsten fiducial markers were deposited into silica trenches with a depths of 50% and 60% of the markers' heights.
Journal of Research (NIST JRES) -
108 No. 1


integrated circuit interconnect, M-sub-3 edge, M-sub-4 edge, M-sub-5 edge, mass absorption, microspectroscopy, tantalum, transmission, tungsten


Levine, Z. , Grantham, S. , Tarrio, C. , Paterson, D. , McNulty, I. , Levin, T. , Ankudinov, A. and Rehr, J. (2003), Mass Absorption Coefficient of Tungsten and Tantalum, 1450 eV to 2350 eV: Experiment, Theory, and Application, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 23, 2024)
Created January 1, 2003, Updated February 17, 2017