Open AccessThe gyromagnetic effect for paramagnetic substances. II.—Results on salts of the iron group
Publication year - 1931
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1931.0139
Subject(s) - paramagnetism , magnetic moment , gyromagnetic ratio , dysprosium , ion , chemistry , ground state , g factor , spin (aerodynamics) , moment (physics) , condensed matter physics , nuclear magnetic resonance , atomic physics , physics , inorganic chemistry , thermodynamics , magnetic field , quantum mechanics , organic chemistry
In a previous paper (referred to hereafter as Part I) a method for measuring the gyromagnetic ratio for paramagnetic substances was described. Owing to the smallness of the angular moment produced by a change in the magnetic moment of a paramagnetic substance, a low frequency resonance method was employed to build up the amplitude to a measurable magnitude. An account of the method of measurement and elimination of errors was given in detail. The results of experiments on one paramagnetic substance, Dy+++ in dysprosium oxide (Dy2 O3 ), showed the Landé splitting factor for this ion to be 1·28, which indicates that the magnetic moment arises from both orbital and spin contributions. This agrees well with the theoretical value 1·33, corresponding to the state6 H15/2 deduced by Hund as the most probable ground state of this ion. The present contribution deals with results on salts of the iron group. The magnetic susceptibilities range from 10-5 to 10-4 compared with 2·4 × 10-4 in the case of the Dy2 O3 previously used. This necessitates a greater sensitivity than that used in Part I, and the means employed to achieve this are described below.