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Forbidden lines from highly charged, metastable ion beams

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Abstract

Forbidden lines have been observed in emission from intense, continuous beams of metastable, highly charged ions produced by an electron cyclotron resonance ion source. The lines are magnetic dipole transitions between levels in the ground configurations of ions with incomplete 2p or 3d subshells. Wavelength measurements have been made for lines from the 2p5 ions Ar9+, K10+, and Ca11+, the 2p4 ions K11+ and Ca12+, and the 2p ions Ar13+ and K14+. Measurements have also been made of lines from transitions between levels of the 3d9,8,7 ions Nb14,15,16+. All the lines lie in the visible spectrum. The technique makes use of a position-sensitive photomultiplier at the exit of a 0.25-m spectrometer.

© 1987 Optical Society of America

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