Isotope Shift in the Spectrum of W I

Abstract

By use of samples enriched in W 183 and W 180 respectively and of natural tungsten the isotope shift in the spectrum of W I was measured, and the ratio of the shift of the neighboring even isotopes was determined. The result is \begin{aligned} \varDelta\nu(186-184):\varDelta\nu(184-182):\varDelta\nu(182-180){=}83{\pm}2:100:66{\pm}5. \end{aligned} Discrepant result of other observers is considered to be due to the neglect of the disturbing effect of the W 183 -components.