Nuclear magnetic double resonance studies of the effect of deuterium substitution upon 1 J(31P-H) in dimethyl phosphite |
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| Authors: | W. McFarlane D.S. Rycroft |
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| Affiliation: | Chemistry Department , Sir John Cass School of Science and Technology, City of London Polytechnic , Jewry Street, London, E.C.3 |
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| Abstract: | A study of the absorption of light by pairs of exchange coupled manganese ions in the perovskite fluorides KMgF3 and KZnF3 has been made using the technique of high resolution phosphorescence excitation spectroscopy. Transitions to the following pair states have been observed: 6 A 1g 4 T 1g a ; 6 A 1g 4 E g a ; 6 A 1g 4 A 1g ; 6 A 1g 4 E g b ; 4 T 1g a 4 T 1g a ; 4 E g a 4 T 1g a and 4 A 1g 4 T 1g a . Quantitative estimates of intensities have been made for some of these transitions as well as estimates of the effective exchange parameters. A detailed analysis of the transition 6 A 1g 6 A 1g → 6 A 1g 4 A 1g provides confirmation of the Tanabe mechanism of exchange induced absorption of light by pairs of transition metal ions. It is shown that absence of MCD in this pair absorption is predicted by the Tanabe mechanism. |
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