Spectral editing in MAS NMR of aprotic solids. 31P-113Cd cross-polarization and heteronuclear double-quantum filtering studies in II-IV-V2 semiconductor alloys.
Magic-angle-spinning NMR spectra of aprotic solids, ceramics and glasses frequently suffer from poor site resolution due to wide chemical shift distribution effects. In such cases, cross-polarization and heteronuclear double-quantum filtering experiments involving nuclei other than 1H offer unique spectral editing capabilities. The utility of such assignment techniques for examining site populations in semiconductor alloys is demonstrated for the chalcopyrite systems CdGeAs2-xPx, CdSiAs2-xPx and ZnxCd1-xGeP2. The results permit a distinction between local and non-local effects on experimental chemical shift trends and reveal that compositional dependences observed in these alloys are dominated by non-local chemical shift contributions.
Department of Chemistry, University of California, Santa Barbara 93106.
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D000497:Alloys / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry; D007554:Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D010758:Phosphorus / Q000737:chemistry; D011789:Quantum Theory; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry
D000497:Alloys; D007554:Isotopes; D002104:Cadmium; D010758:Phosphorus; D012825:Silicon