ANALYSIS OF QUASI-CONTINUUM BANDS AND LINE SPECTRA OF HIGHLY IONIZED W and Au

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Abstract
The spectra of heavy elements (Z > 50) observed in laser-produced plasmas, vacuum sparks and Tokamaks are characterized by a strong quasi-continuum band emitted in the 40-100 Å range. This band originates from the blending of a great number of lines emitted in the Ɗ n=0, n=4 transitions. Indeed, the Unresolved Transition Array (UTA) computations show that for about twenty adjacent ionization States, the mean wavelength of the main resonance transitions remains in a very small wavelength range. The results of these computations are given here for tungsten and gold. The computations rely on new UTA formulae which include the effect of configuration mixing. This work extends the previous results obtained for the rare-earths spectra

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