Collective dynamics of liquid potassium studied by inelastic neutron scattering

Dispersion curves of collective excitations have been obtained from the data on inelastic neutron scattering on liquid potassium at 340 and 550 K for the wave-vector transfer region of 1.0 < = Q < = 1.3 A exp -1 . Experimental points were described in the frame of a model for longitudinal coll...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1996-10, Vol.234-236, p.359-361
Main Authors: Novikov, A G, Savostin, V V, Shimkevich, A L, Zaezjev, M V
Format: Article
Language:English
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Summary:Dispersion curves of collective excitations have been obtained from the data on inelastic neutron scattering on liquid potassium at 340 and 550 K for the wave-vector transfer region of 1.0 < = Q < = 1.3 A exp -1 . Experimental points were described in the frame of a model for longitudinal collective modes. In using the values of model parameters omega sub E and r sub o , the shear modulus and the high-frequency sound velocity have been evaluated. The latter seems to exceed the adiabatic sound velocity beyond the hydrodynamic limit (Q > 0.1 A exp -1 ) near the melting point due to the effects of shear relaxation. This is the characteristic feature of liquid alkali metals.
ISSN:0921-4526