Sökning: "inelastic neutron scattering"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden inelastic neutron scattering.

1. 1. Neutron Scattering at 96 MeV

   Författare :Angelica Öhrn; Jan Blomgren; Robert Haight; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; neutron; elastic scattering; inelastic scattering; differential cross section; optical model potential; Wick s limit; angular distribution; pre-equilibrium; Kärnfysik; Physics; Fysik;

   Sammanfattning : Data on elastic scattering of 96 MeV neutrons from 56Fe, 89Y and 208Pb in the angular interval 10-70° are presented. The previously published data on 208Pb have been extended, as a new method has been developed to obtain additional information at the most forward angles. LÄS MER

3. 2. Experimental Studies of Neutron Emission Induced by Heavy-Ion Scattering

   Författare :Pawel Nadel-Turonski; Leif Nilsson; Adriaan van den Berg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; neutron; inelastic scattering; heavy ions; position sensitive silicon detectors; storage ring; cluster-jet target; differential cross section; Kärnfysik; Nuclear physics; Kärnfysik;

   Sammanfattning : A beam of 250A MeV 17O ions was scattered from argon and xenon targets. The large excess of fast neutrons compared with statistical model calculations that was observed earlier for xenon, was confirmed and found for argon as well. LÄS MER

4. 3. Neutron spectroscopy studies of vibrational and diffusional dynamics in organometal halide and oxyhydride perovskites

   Författare :Rasmus Lavén; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Metal halide perovskites; perovskites; phonons; quasielastic neutron scattering; inelastic neutron scattering; oxyhydrides; hydrogen dynamics.; diffusion;

   Sammanfattning : This thesis deals with inelastic and quasielastic neutron scattering studies on the dynamical properties of the organometal halide perovskite system MA1-xFAxPbI3 (MA = methylammonium; FA = formamidinium) and of the layered perovskite-type oxyhydride SrVO2H. These materials systems are of high interest for their excellent photovoltaic performance (MA1-xFAxPbI3) and hydride-ion conductivity (SrVO2H) and concomitant promise for various technological devices; however, the local structure and dynamics underpinning these materials properties remain unclear. LÄS MER

5. 4. Neutron spectroscopy and computational studies of hydride-ion dynamics in oxide- and nitride-hydride materials

   Författare :Lucas Fine; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Oxide-hydride; phonons; inelastic neutron scattering; hydride-ions; quasielastic neutron scattering; density functional theory.; nitride-hydride; diffusion;

   Sammanfattning : This thesis presents studies of the hydride-ion dynamics in the nitride- and oxide­hydride materials Ca3CrN3H and BaTiO3-xHx (with x < 0.2). LÄS MER

7. 5. Dynamical properties of metal halide and oxyhydride perovskites

   Författare :Rasmus Lavén; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; perovskite; quasielastic neutron scattering; phonon; inelastic neutron scattering; diffusion; oxyhydride; hydrogen dynamics; Metal halide perovskite; hydride ion.;

   Sammanfattning : This thesis concerns investigations on the dynamical properties of two classes of energy-relevant materials, namely metal halide and oxyhydride perovskites, using neutron scattering techniques. These two classes of materials share the same aspect of a perovskite-type crystal structure but are different in terms of their functional properties and concomitant promise for various technological applications. LÄS MER