NH3 DYNAMICS IN ZN(NH3)(4)I-2 AND ZN(NH3)(4)BR-2 INVESTIGATED BY INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING

Authors
ALTORFER F ESSMANN R
Citation
F. Altorfer et R. Essmann, NH3 DYNAMICS IN ZN(NH3)(4)I-2 AND ZN(NH3)(4)BR-2 INVESTIGATED BY INCOHERENT QUASI-ELASTIC NEUTRON-SCATTERING, Physica. B, Condensed matter, 234, 1997, pp. 61-63
Citations number
3
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
234
Year of publication
1997
Pages
61 - 63
Database
ISI
SICI code
0921-4526(1997)234:<61:NDIZAZ>2.0.ZU;2-0
Abstract
We report on studies of NH3 dynamics in Zn(NH3)(4)I-2 and Zn(NH3)(4)Br -2 by means of incoherent quasielastic neutron scattering in the tempe rature range from 150 to 300 K. Quasielastic experiments were carried out on the Fermi chopper time-of-flight spectrometer at NIST. The Lore ntzian full-widths at half-maximum, f(w), of the quasielastic line fol low an Arrhenius law and increase from 0.39 [0.25] meV at 150 K to 1.3 3 [0.80] meV at 300 K. We find an activation energy E-a for the NH3 re orientations of 32(1) and 30(3) meV for Zn(NH3)(4)I-2 and Zn(NH3)(4)Br -2, respectively.