Zeeman effect of 14N nuclear quadrupole resonance with polycrystalline samples

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Abstract
A theory of the Zeeman effect of 14N nuclear quadrupole resonance with polycrystalline samples is presented. A method for the identification of lines and the measurement of asymmetry parameters is described. The linewidth is taken into account and plays an important role. The results are general and apply for arbitrary angles between the radio‐frequency magnetic field and the Zeeman magnetic field, and for any value for the asymmetry parameter between 0.005 and 0.993. No such results exist in the literature, since the only particular case reported so far is invalidated in its quantitative aspects by an error as demonstrated in this paper. The method is shown to be useful when only one line of a pair is known, when several lines have to be identified, or when attempts are made to assign the lines in ν+, ν− pairs. The results have been experimentally verified in several cases.