Abstract

Candidate photopumping materials for resonant photoexcitation x-ray laser schemes were examined to determine spectral line position and radiant line intensity. Improved spectroscopic techniques have permitted several comparative measurements to be made with greater sensitivity and resolution than that of earlier work. A cylindrically focused 0.527-μm laser beam was used to generate the plasma source emission by irradiating thin foil targets. Selected wavelength regions in the 10–17-Å range were studied for possible line coincidences between K-series transitions in F, Ne, and O with emission from transition-metal targets. Within the measurement accuracy of ±2 mÅ, exact spectral line coincidences were found for Mn with the F H-β line at 12.643 Å and for both Mn and Cr with the F He-β line at 14.458 Å. The Mn line at 12.643 has been identified, using ab initio atomic-structure calculations, as the 1D21F3 transition in Be-like Mn xxii. This line was found to yield 2–5 mJ into 2π sr with 20 J of laser energy on target. Spectral identifications and wavelengths for Be-like Ti, Cr, Mn, Fe, and Co lines, for Li-like Ti, Cr, and Mn lines, and for N-like Mn lines also resulted from this work.

© 1985 Optical Society of America

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