Dynamics of liquid ammonia from cold neutron scattering

Thaper, C. L. ; Dasannacharya, B. A. ; Goyal, P. S. (1974) Dynamics of liquid ammonia from cold neutron scattering Pramana - Journal of Physics, 2 (3). pp. 148-157. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/2/3/148-157...

Related URL: http://dx.doi.org/10.1007/BF02847325


The scattering of 4.1 Å neutrons by liquid ammonia has been measured at 218 K in the angular range of 30-90° using the Trombay rotating crystal spectrometer. The experimental data, after correcting for multiple scattering, have been compared with model calculations, and it is shown that it is possible to get detailed information about the rotational correlation function on the basis of neutron experiments alone. The model assumes Langevin diffusion for translational motions. Rotational motions are described by means of an orientational correlation function which has a gaseous behaviour for times up to τ0 and then changes over to a diffusive character with a rotational diffusion constant Dr. Within the framework of the model the correlation function can be described with Dr=0.28×1013sec-1 and τ 0=0.57×10-18sec. Corrections for multiple scattering and their dependence on model parameters are discussed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Liquid Ammonia; Neutron Inelastic Scattering; Rotational Correlation Function; Multiple Scattering
ID Code:10222
Deposited On:04 Nov 2010 06:53
Last Modified:16 May 2016 19:52

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