2H-NMR study of ammonium ion rotational tunneling and reorientation in (ND4)2SnCl6 single crystal: II.T levels structure

Autor:	Eero Ylinen, L.P. Ingman, Matti Punkkinen, Z. T. Lalowicz
Rok vydání:	1990
Předmět:	Physics Isotope Condensed Matter Physics Molecular physics Spectral line Electronic Optical and Magnetic Materials Ion symbols.namesake chemistry.chemical_compound Tunnel effect chemistry symbols General Materials Science Ammonium Hamiltonian (quantum mechanics) Single crystal Quantum tunnelling
Zdroj:	Zeitschrift f�r Physik B Condensed Matter. 80:103-112
ISSN:	1434-6036 0722-3277
DOI:	10.1007/bf01390655
Popis:	In the preceding paper (Z. Phys. B — Condensed Matter66, 363 (1987)) we had shown that2H-NMR spectra of ND4+ in a cubic potential were separable into components originating fromA, E andT symmetry species. Separations of theA andE doublets supply currently an unique way to measure theA−T tunneling splitting up to about 10 MHz. Now we analyse tunneling effects and angular dependence ofT spectral components. Calculated spectra show angular dependence which varies withT levels structure. The spectra depend on theT−T splittings, allowing their evaluation up to about 1 MHz. The threeT levels of ND4+ in (ND4)2SnCl6 are found to be split asymmetrically by 91.5 kHz and 49.5 kHz at 4.2 K. The isotope reduction for theT level splittings amounts to about 670, in contrast to a factor 100 found for theA−T splitting.
Databáze:	OpenAIRE
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