Abstract
Using lead fluoride/cryolite multilayer coatings, one can get highly efficient Fabry–Perot interferometers. This allows the use of two etalons in series, even for studying the weak forbidden line λ = 2656 Å. The first acts as a filter; the second, used in a conventional photoelectric Fabry–Perot spectrometer device, gives a precise 199Hg−201Hg isotope-shift measurement. The measured shift is 187.3 ± 0.8 mK.
© 1965 Optical Society of America
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