title: First observation of inelastic X-ray scattering from condensed (4)He using high energy resolution.
abstract: 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.
authors.forename: N
authors.initials: N
authors.lastname: Schell
authors.forename: R O
authors.initials: RO
authors.lastname: Simmons
authors.forename: E
authors.initials: E
authors.lastname: Burkel