Abstract

Nonresonance spectral lines of Mg xii and Mg xi emitted by magnesium laser-produced plasmas have been observed in the extreme-vacuum-ultraviolet region and their transitions classified. As many as eight beams of the Omega laser system of the Laboratory for Laser Energetics at the University of Rochester were linearly focused onto magnesium-coated flat targets to produce linear plasma radiation sources from 3 to 6 mm long. The spectra were photographed end-on with a grazing-incidence spectrograph. The identified Mg xii lines are classified as 2s–3p, 2p–3d, 2s–4p, 2p–4d, and 3d–4f transitions. The identified Mg xi lines are classified as 1s2s–1s3p, 1s2p–1s3d, 1s2p–1s4d, 1s3p–1s4d, and 1s3d–1s4f. Ionization differentiation is based on comparing the present data with other magnesium spectra emitted from plasmas produced by different sources or differing in the ionization conditions. Transition classification is based on comparing the experimental wavelengths with the calculated values and studying the correlation between observed line intensities and the calculated oscillator strengths.

© 1990 Optical Society of America

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