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The ratios of the Larmor frequencies of  10  B and  2  H and of  11  B and  10  B have been measured with the NMR method and a magnetic moment has been calculated for  10  B in the B (OH) 4  -  -ion. For this, an investigation of the dependence of the NMR signals of  10  B and  2  H on the concentration of some boron salts in solutions of H 2 O and D 2 O was necessary. Using hyperfine interaction constants from literature, the hyperfine structure anomaly  10  ∆  11  of boron in the  2  P 1/2  atomic ground state has been calculated. A difference in the magnetic shielding between the isotopes  10  B and  11  B in different compounds could not be detected.

Fourier-Kernresonanzuntersuchungen an 10 B und 11 B in wäßriger Lösung / Fourier Transform NMR Studies of 10 B and 11 B in Aqueous Solutions