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Isotope Shift in the First Spectrum of Silicon (Si i)

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Abstract

Isotope shifts of 30Si relative to 28Si have been observed in eleven ultraviolet lines of the neutral silicon spectrum. The spectra of two highly enriched samples of elemental silicon were excited separately in two hollow-cathode discharge tubes cooled in liquid nitrogen. An externally mounted Fabry-Perot interferometer, used in connection with a medium Hilger, quartz-prism spectrograph, provided the high resolution necessary for these observations. The magnitudes of the observed shifts vary from Δν~0.011±0.001 cm−1 for the (3p2 3P–4s 3P0) transition to Δν~0.115±0.002 cm−1 for the (3p2 3P–3a 3D0) transition.

© 1962 Optical Society of America

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