4

July 1, '50

Measurement of the resonance frequencies of Re¹⁸⁵ & Re¹⁸⁷ relative to that of Na²³

ν(Na²³) = 7526.1 (1 ± 7 x 10^-5) Kc (1/4M NaCl + 1M MnSO₄

Schüler & Korsching's value 1.01069 ± 0.00043
obtained from the hfs of λ 4889 in ReI spectrum.