TY - JOUR
T1 - Collective Excitations in Liquid Hydrogen Observed by Coherent Neutron Scattering
AU - da Costa Carneiro, Kim
AU - Nielsen, M.
AU - McTague, J. P.
PY - 1973
Y1 - 1973
N2 - Coherent scattering of neutrons by liquid parahydrogen shows the existence of well-defined collective excitations in this liquid. Qualitative similarity with the scattering from liquid helium is found. Furthermore, in the range of observed wave vectors, 0.7 Å-1 ≤κ≤3.1 Å-1, extending from the first through the third Brillouin zones in the solid, S(κ,ω) is remarkably similar to the scattering law expected from a polycrystal. For κ≤2.3 Å-1 the observed spectra satisfy the one-phonon sum rule with mean square displacement 〈u2〉=1.0 Å2.
AB - Coherent scattering of neutrons by liquid parahydrogen shows the existence of well-defined collective excitations in this liquid. Qualitative similarity with the scattering from liquid helium is found. Furthermore, in the range of observed wave vectors, 0.7 Å-1 ≤κ≤3.1 Å-1, extending from the first through the third Brillouin zones in the solid, S(κ,ω) is remarkably similar to the scattering law expected from a polycrystal. For κ≤2.3 Å-1 the observed spectra satisfy the one-phonon sum rule with mean square displacement 〈u2〉=1.0 Å2.
U2 - 10.1103/PhysRevLett.30.481
DO - 10.1103/PhysRevLett.30.481
M3 - Journal article
SN - 0031-9007
VL - 30
SP - 481
EP - 485
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
ER -