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Nuclear magnetic resonance spectra of Cue3 and AlZ7, Gaaa and In115 have been recorded in ternary IB-III-VI, semiconductors, which crystallize in the tetragonal chalcopyrite structure. Nuclear electric quadrupole coupling constants have been determined and are discussed in connection with the structural parameters of these compounds, which were determined by X-ray diffraction.Es wurden die Kernresonanzspektren von Cus3 und AP7, Ga60 und In115 in den ternaren IB-III-VI,-Halbleitern, die in der tetragonalen Chalkopyrit-Struktur kristallisieren, bestimmt. Die elektrischen Kern-Quadrupol-Kopplungskonstanten wurden bestimmt und werden in Verbindung mit den Strukturparametern dieser Verbindungen diskutiert, die durch Rontgenbeugung bestimmt wurden.

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The Electron-Spin-Resonance of Mn 2+ -ions in synthetic cubic and hexagonal ZnS crystals has been observed at X-band frequencies. At 300 °K the following values for the parameters of the Spin-HAMiLTONian resulted for cubic ZnS: #=2,0024 + 0,0003 , a=+0,000787 ± 0,000006 cm" 1 , A = -0,00640±0,00001 cm" 1 . A weak superhyperfine structure due to an interaction of the 3d-electrons of the Mn 2+ -ion with the surrounding Zn 67 -nuclei was also resolved. The influence of stacking faults in cubic ZnS crystals on the position and linewidth of the Mn 2+ -spectrum was investigated in detail.For hexagonal ZnS we found at 300 °K:g" =2,0018±0,0003 , a-F= +0,000768±0,00001 cm" 1 , a= +0,000735 ±0,00001 cm" 1 , A = -0,00649 ± 0,00001 cm" 1 , D--0,01309±0,00003 cm" 1 , P= +0,000010±0,000002 cm" 1 . The quadrupole coupling constant P was determined from forbidden Am = ±1 transitions. A strong decrease of the spin-lattice relaxation time of the Mn 2+ -ion was observed in photoconducting ZnS crystals under uv-illumination at 77 °K. Über die Elektronen-Spin-Resonanz (ESR) von