Physics Reports vol.291 by PDF

ISBN-10: 9290830727

ISBN-13: 9789290830726

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In a symmetric setup where both field integrals before and after the 1t-coil are identical, the neutron spin turns by another phase angle ~2 = ~1=2Nx+A~1. The spin transformation at the x-coil compensates the residual angles A~l and in front of the second x/2-coil the neutron spin points again into ist original perpendicular direction, independent of its velocity. The second x/2-coil projects this perpendicular component of the polarization into the forward direction and than at the supermirror analyzer the total polarization is recovered.

In this chapter we first outline some principles of quasielastic incoherent neutron scattering and give some examples for incoherent scattering functions. Thereafter, we focus on the dynamics of lipid molecules in a lipid bilayer discussing fast dynamical processes like intramolecular dynamics and protrusion motion as well as slow processes like transla- 32 tional diffusion. Finally we briefly present first results on the water dynamics in between the lipid bilayers. 1 Incoherent neutron scattering Since the scattering amplitudes for the two different relative spin orientations of neutron and proton are grossly different, due to the spin disorder of the proton spins neutron scattering from an ensemble of protons is overwhelmingly incoherent and measures directly the selfcorrelation function of protonic motion.

0 .. . . .. .. o DPPC, 45°-0rien. • DPPC, 135°-0rien. 5 ... t).. -', .. ""~" -......... ~ .... •. •. 1S: The EISF for a DPPC sample containing 12% water at T=60oC (Tc=52°C) for both orientations of the sample with respect to the neutron beam. The dashed and solid lines are explained in the text. The insert sketches schematically the different mobility ranges for protons starting from the head (narrow range) to the tail. In order to get an idea on the extend of the protonic motion, in a first attempt each proton was associated with a spherical volume over which it can diffuse.

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Physics Reports vol.291

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