Results 261 to 270 of about 1,010,863 (285)

Quasielastic Electron Scattering and Vacuum Polarization

Physical Review Letters, 1989
The longitudinal response function for quasielastic electron scattering from /sup 12/C and /sup 40/Ca at a momentum transfer q = 550 MeV is calculated in a relativistic random-phase approximation (RPA). The particle-hole response is calculated exactly in the finite system while vacuum-polarization effects are included in a local-density approximation ...
Jorge Piekarewicz, Charles Horowitz
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Scaling in quasielastic electron scattering

AIP Conference Proceedings, 1988
The inclusive (e, e’) cross section on various nuclei in the quasielastic region (Q2/2Mν∼1) has recently been measured in the range 0.25≤Q2≤3.1. Analysis of these data in the plane‐wave impulse approximation allows extraction of a scaling function related to the nucleon momentum distribution.
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Parity-violating quasielastic electron scattering

Physical Review C, 1993
The parity-violating asymmetry [ital A] is calculated for quasielastic electron scattering. We use a relativistic mean field model of the nuclear matter response. A Lorentz scalar mean field (which reduces the nucleon's mass) decreases [vert bar][ital A][vert bar] by a relatively large amount.
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Quasielastic light scattering microscope spectrometer

Applied Optics, 1987
We have developed a quasielastic light scattering microscope spectrometer from a commercially available instrument. The coherence requirements of microscope spectrometers have been examined, and our system performs in agreement with theory. Microscopic scattering volumes can be studied while still minimizing spatial averaging effects on the intensity ...
Francis D. Carlson, Roy B. Tishler, Paul S. Blank   +2 more
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Quasielastic scattering by dilute polymer solutions

Journal of Polymer Science Part B: Polymer Physics, 1976
AbstractThe scattering law S(k,w) for dilute polymer solutions is obtained from Kirkwood's diffusion equation via the projection operator technique. The width Ω(k) of S(k,w) is obtained for all k without replacing the Oseen tensor by its average (as is done in the Rouse–Zimm model) using the “spring‐bead” model ignoring memory effects.
H. Gurol, Z. Akcasu
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A quasielastic light scattering detector for chromatographic analysis

Review of Scientific Instruments, 1993
Very sensitive laser light scattering equipment has been designed to be used in conjunction with chromatographic column separation. The system is prealigned and fully computer controlled. It gives the hydrodynamic radius of the eluting particles on line during separation.
P. Lago, ROVATI, Luigi, L. Cantu, M. Corti   +3 more
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Dynamics of collagen hydration by quasielastic neutron scattering

Physica B: Condensed Matter, 2000
Abstract QENS spectra from 52% H 2 O-hydrated collagen fibres ( T =276–321 K) were modelled by three-component scattering laws including small central peak broadenings. These give diffusion coefficients for mobile H 2 O of ∼5×10 −6  cm 2 /s, with activation energy ∼2 kcal/mol. The broad components relate to localised modes.
Middendorf, H.D., Traore, A., Foucat, Loic, Renou, J.P., Ferrand, M.   +4 more
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Positron differential quasielastic scattering by molecules

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2002
Abstract An overview of relative differential cross section (DCS) measurements in the range 30–135° for quasielastic scattering (elastic scattering plus rotational and vibrational excitations) of 4–200 eV positrons by N 2 , O 2 , CO, CO 2 , N 2 O and CH 4 , along with recent measurements for C 2 H 2 and S 6 is reported. For N 2 , O 2 , CO and CH 4
C. K. Kwan, D. A. Przybyla, W. E. Kauppila, T. S. Stein   +3 more
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Quasielastic light scattering from rutile

Physical Review B, 1999
Quasielastic light scattering consisting of two components has been observed in single crystals of rutile (TiO{sub 2}). The broad component with a linewidth of 330 GHz at 297 K becomes narrower with decreasing temperature. In contrast, the narrow component, which has a linewidth of 1.1 GHz at 297 K, broadens as the temperature decreases.
Seishiro Saikan, Masayuki Yoshizawa, M. Grimsditch, Akitoshi Koreeda   +3 more
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Quasielastic and Inelastic Neutron Scattering

1982
The neutron is a heavy particle compared to photons and therefore scattering spectroscopy using neutrons covers a unique range of frequency-spatial correlations. For inelastic experiments the far infra-red spectroscopic range up to ∼1000 cm-1 may be observed with sizeable wave vector transfers and phonon dispersion curves mapped out.
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