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Reference lines in the optogalvanic spectra of uranium and thorium over the wavelength range 694–755 nm

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Abstract

The optogalvanic spectra of uranium and thorium are convenient sources of lines with which to calibrate wavemeters for high-resolution laser spectroscopy. We used hollow-cathode lamps for both uranium and thorium to observe the spectra, using a single-frequency cw dye laser operating over the wavelength range 694–755 nm. Eight uranium and seven thorium lines were measured with an accuracy of a few parts in 108 with our Fabry–Perot wavemeter. The estimated uncertainty of the measurements is 0.0002 cm-1 for both species. The results were compared with several previous measurements of these lines and were found to be in good agreement with values determined by Fourier-transform spectroscopy.

© 2002 Optical Society of America

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