Open AccessFirst observation of inelastic X‐ray scattering from condensed 4 He using high energy resolution
Author(s) -
Schell N.,
Simmons R. O.,
Burkel E.
Publication year - 1996
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049596008941
Subject(s) - desy , spectrometer , scattering , inelastic scattering , helium , storage ring , melting point , resolution (logic) , atomic physics , liquid helium , materials science , physics , nuclear physics , optics , beam (structure) , artificial intelligence , computer science , composite material
Recently, the suitability of inelastic X‐ray scattering for the investigation of solid and fluid 4 He has been demonstrated. For the test experiments an energy resolution of the order of 10–15 meV was used at the backscattering spectrometer INELAX at the storage ring DORIS of DESY, Hamburg. Lattice excitations were observed for momentum transfers along the c axis of h.c.p. helium crystals which were grown in situ at pressures of 54–63 MPa and at temperatures of 4.2–6.4 K. At 10 K above the melting point, energy‐loss signals could also be detected from the liquid helium at equivalent momentum transfers.