WAVELENGTHS AND ENERGY-LEVELS OF NEUTRAL KR-84 AND LEVEL SHIFTS IN ALL KR EVEN ISOTOPES

Interferometrically-measured wavelengths of 109 lines of neutral Kr-84 are compared with those of Kr-86. Sixty energy levels of neutral Kr-8 4 derived from those wavelengths and 25 Kr-86-Kr-84 isotope shifts pre viously measured are given along with their shifts from the energy lev els of Kr-86. Twenty levels of each of Kr-82, Kr-80, and Kr-78 are als o evaluated using isotope-shift information in the literature. The dif ferences between the experimentally observed shifts and the normal mas s shift leave large negative residuals which are accounted for by ioni zation energy differences and by the specific mass shift. It appears t hat the volume effect causes only a very small, if any, energy level s hift.