Ammonium tunnel levels and spin-rotational wavefunctions in (NH4)(2)S2O8



: Kankaanpaa M, Ylinen EE, Punkkinen M

Publisher: ACADEMIC PRESS INC

: 2001

Solid State Nuclear Magnetic Resonance

SOLID STATE NUCLEAR MAGNETIC RESONANCE

: SOLID STATE NUCL MAG

: 19

: 1-2

: 19

: 28

: 10

: 0926-2040

DOI: https://doi.org/10.1006/snmr.2000.0019


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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