Volume 53, Number 1, January 2001
|Page(s)||34 - 39|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Microscopic dynamics of liquid hydrogen
CNR, Istituto di Elettronica Quantistica
Via Panciatichi 56/30, I-50127 Firenze, Italy
2 CNR, Gruppo Nazionale di Struttura della Materia Viale dell'Università 11, I-00185 Roma, Italy
3 Rutherford Appleton Laboratory, ISIS Neutron Facility Chilton, Didcot, Oxon, OX11 0QX, UK
Accepted: 20 October 2000
We have measured the almost-pure incoherent scattering function of liquid para-hydrogen using neutron inelastic scattering. The experiment was carried out on TOSCA, a time-of-flight, inverse geometry, crystal analyser spectrometer, operating on the pulsed-neutron source ISIS (UK). Since the instrument kinematic region is close to a line in the (k, E)-plane, we have actually measured the projection of on this line. The measured cross-section gives a direct experimental access to the microscopic dynamic of the centre-of-mass motion of molecular hydrogen. The data have been analysed using the Gaussian approximation and have been compared with the results of a novel Quantum Mechanical Molecular Dynamics simulation technique. The results are encouraging, but claim for further developments of the theoretical approach, as well as for more extensive experimental data.
PACS: 61.12.Ex – Neutron scattering techniques (including small-angle scattering) / 64.70.Dv – Solid-liquid transitions / 67.90.+z – Other topics in quantum fluids and solids; liquid and solid helium
© EDP Sciences, 2001
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