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PARAMAGNETIC RESONANCE SPECTRA OF NO2 TRAPPED IN ALKALI HALIDES,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY
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The impurity NO2 has been introduced into certain alkali-halide crystals. Two configurations of the NO2 molecule have been detected. In the first configuration detectable at 77K the impurity appears to occupy a positive ion vacancy and except for a possible libratory motion is frozen into 110 planes of the lattice. In the second modification the NO2 molecule probably occupies a negative ion vacancy and is rotating even at 2K about its y axis the O---O direction. This axis is parallel to crystallographic 111 directions. An analysis of the 14N and 17O hyperfine data is offered. Author
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