A1 Refereed original research article in a scientific journal
DEUTERON NMR-SPECTRUM OF ND4VO3 AND SOME OTHER AMMONIUM-COMPOUNDS
Authors: YLINEN EE, LALOWICZ ZT, SAGNOWSKI SF, PUNKKINEN M, KOIVULA E, INGMAN LP
Publisher: ELSEVIER SCIENCE BV
Publication year: 1992
Journal:: Chemical Physics Letters
Journal name in source: CHEMICAL PHYSICS LETTERS
Journal acronym: CHEM PHYS LETT
Volume: 192
Issue: 5-6
First page : 590
Last page: 594
Number of pages: 5
ISSN: 0009-2614
DOI: https://doi.org/10.1016/0009-2614(92)85521-B
Abstract
Deuteron NMR absorption line shape and its temperature dependence were studied in ND4VO3 especially in the temperature range from 60 to 90 K, where the only molecular motion important for NMR is the reorientation about one threefold axis of ND4. Computer fits of the model by Lalowicz and Sagnowski to our experimental spectra gave the activation energy E(a) = 8.3 kJ/mol. Besides ND4VO3 the low-symmetry samples (ND4)2Cr2O7, (ND4)2Ce(NO3), and ND4ClO4 have, above the line-width transition region, a doublet as their absorption curve, which gradually narrows to a single line with a rising temperature. Various contributions to the magnitude of the doublet separation are discussed.
Deuteron NMR absorption line shape and its temperature dependence were studied in ND4VO3 especially in the temperature range from 60 to 90 K, where the only molecular motion important for NMR is the reorientation about one threefold axis of ND4. Computer fits of the model by Lalowicz and Sagnowski to our experimental spectra gave the activation energy E(a) = 8.3 kJ/mol. Besides ND4VO3 the low-symmetry samples (ND4)2Cr2O7, (ND4)2Ce(NO3), and ND4ClO4 have, above the line-width transition region, a doublet as their absorption curve, which gradually narrows to a single line with a rising temperature. Various contributions to the magnitude of the doublet separation are discussed.
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