The hyperfine structure of the spectrum of Ru I was studied, and a displacement effect of the order of 0.015 cm -1 between even isotopes having the difference of two neutron numbers was found in the lines corresponding to the transition 5 s –5 p . The spins of the odd isotopes were found to be 9/2≧ I /≧5/2, the nuclear magnetic moments being negative.
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Kiyoshi Murakawa (1953) studied this question.
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