Abstract

The isotope shift in the 283.3-nm resonance line of mass-separated radioactive 202Pb was measured by absorption spectroscopy with the use of our 9.1-m focal-length Czerny–Turner spectrometer. The value of the shift, relative to 208Pb, is −208(3) × 10−3 cm−1. A signal-averaging scanning technique was used to record the spectrum. Isotonic comparisons with the relative isotope shifts in mercury and thallium indicate a possible effect on the isotope shift of the unpaired proton in thallium.

© 1983 Optical Society of America

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