Abstract

The term analysis of complex doubly ionized spectra is made more difficult by the large number of neutral and singly ionized lines that accompany the desired spectra as well as the lack of precision in wavelengths and intensities obtained from conventional spectrographs. To overcome these difficulties, we used a Fourier-transform spectrometer to obtain the spectra of uranium in a hollow cathode filled with a helium–argon mixture or neon. The separation of ion stages was based on the intensity variation of the doubly ionized lines between the two spectra. The wavelength accuracy permitted the first reported determination of energy levels in doubly ionized uranium. We report 22 low-lying odd levels and 36 high-lying even levels. The Fourier-transform spectrometer is a useful and appropriate instrument for starting the analysis of complex ionized spectra because of its wavelength and intensity accuracy.

© 1984 Optical Society of America

Study of the emission intensities of doubly ionized uranium (U iii) in a hollow-cathode discharge

K. N. Piyakis and J. M. Gagné
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Optogalvanic study of doubly ionized uranium (U iii) in a hollow-cathode discharge

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Optogalvanic measurement of isotope shifts of doubly ionized uranium (U iii) made using natural-U samples

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Energy levels of neutral californium (²⁴⁹Cf i) and singly ionized californium (²⁴⁹Cf ii)

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