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Ammonium Tunnel Levels and Spin-Rotational Wavefunctions in (NH4)2S2O8

✍ Scribed by M. Kankaanpää; E.E. Ylinen; M. Punkkinen

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 104 KB
Volume: 19
Category: Article
ISSN: 0926-2040
DOI: 10.1006/snmr.2000.0019

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✦ Synopsis

Proton spin-lattice relaxation in a single crystal of (NH 4 ) 2 S 2 O 8 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 et al. (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.

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