A1 Refereed original research article in a scientific journal
Ammonium tunnel levels and spin-rotational wavefunctions in (NH4)(2)S2O8
Authors: Kankaanpaa M, Ylinen EE, Punkkinen M
Publisher: ACADEMIC PRESS INC
Publication year: 2001
Journal:: Solid State Nuclear Magnetic Resonance
Journal name in source: SOLID STATE NUCLEAR MAGNETIC RESONANCE
Journal acronym: SOLID STATE NUCL MAG
Volume: 19
Issue: 1-2
First page : 19
Last page: 28
Number of pages: 10
ISSN: 0926-2040
DOI: https://doi.org/10.1006/snmr.2000.0019
Abstract
Proton spin-lattice relaxation in a single crystal of (NH4)(2)S2O8 was studied as a function of resonance frequency at various constant temperatures between 4.2 and 30 K. Two T-1 minima were found, one at 8.6 MHz and the other at 4.3 MHz. They are related to the splitting between the lowest T level and the A level, equal to 8.6 MHz nearly independently of temperature below 25 K. Together with the large tunnel splitting of 269 MHz, determined earlier by Clough ct nl. (Chem. Phys. 152, 343 (1991)) our results define the spin-rotational wavefunction of the lowest T level very accurately, although those of the two higher T levels remain largely undetermined, (C) 2001 Academic Press.
Proton spin-lattice relaxation in a single crystal of (NH4)(2)S2O8 was studied as a function of resonance frequency at various constant temperatures between 4.2 and 30 K. Two T-1 minima were found, one at 8.6 MHz and the other at 4.3 MHz. They are related to the splitting between the lowest T level and the A level, equal to 8.6 MHz nearly independently of temperature below 25 K. Together with the large tunnel splitting of 269 MHz, determined earlier by Clough ct nl. (Chem. Phys. 152, 343 (1991)) our results define the spin-rotational wavefunction of the lowest T level very accurately, although those of the two higher T levels remain largely undetermined, (C) 2001 Academic Press.
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