A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
DEUTERON NMR-SPECTRUM OF ND4VO3 AND SOME OTHER AMMONIUM-COMPOUNDS
Tekijät: YLINEN EE, LALOWICZ ZT, SAGNOWSKI SF, PUNKKINEN M, KOIVULA E, INGMAN LP
Kustantaja: ELSEVIER SCIENCE BV
Julkaisuvuosi: 1992
Lehti:: Chemical Physics Letters
Tietokannassa oleva lehden nimi: CHEMICAL PHYSICS LETTERS
Lehden akronyymi: CHEM PHYS LETT
Vuosikerta: 192
Numero: 5-6
Aloitussivu: 590
Lopetussivu: 594
Sivujen määrä: 5
ISSN: 0009-2614
DOI: https://doi.org/10.1016/0009-2614(92)85521-B
Tiivistelmä
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.
Turun yliopiston Tutkimustietojärjestelmän portaali