Pulsed Neutron Scattering |
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Page 21
... spread in position . This spread gives rise to a phase mismatch which causes all Bragg reflections to be reduced in intensity . Equation ( 1.16 ) is modified to do ( 2π ) 3 ΦΩ Vcell · Σd ( Q - t ) | F ( t ) | 2 e - 2w . τ ( 1.21 ) 2W is ...
... spread in position . This spread gives rise to a phase mismatch which causes all Bragg reflections to be reduced in intensity . Equation ( 1.16 ) is modified to do ( 2π ) 3 ΦΩ Vcell · Σd ( Q - t ) | F ( t ) | 2 e - 2w . τ ( 1.21 ) 2W is ...
Page 336
... spread ΔΟΞ 2 1/2 ( až x } + x2n2 + a } n22 ) 1 ( a 2 + x2 + 4 n 2 ) 1 / 2 This gives rise to the scattered wave - vector spread Ak1 = k1 cot 0 0 · A The spread in incident energy is determined by distance and timing errors over the ...
... spread ΔΟΞ 2 1/2 ( až x } + x2n2 + a } n22 ) 1 ( a 2 + x2 + 4 n 2 ) 1 / 2 This gives rise to the scattered wave - vector spread Ak1 = k1 cot 0 0 · A The spread in incident energy is determined by distance and timing errors over the ...
Page 376
... spread at the sample is determined only by the rotor pulse length . It is typically 10 μs at 100 meV energies . ( ii ) Inverted geometry spectrometers give a spread of times At , depending on the spread of energy transfers m 1/2 2 L 1 1 ...
... spread at the sample is determined only by the rotor pulse length . It is typically 10 μs at 100 meV energies . ( ii ) Inverted geometry spectrometers give a spread of times At , depending on the spread of energy transfers m 1/2 2 L 1 1 ...
Common terms and phrases
absorption accelerator atoms background beam tube beryllium Bragg reflection calculated cell collimation count-rate counter bank cross-section crystal monochromator curve defined density depends detector diffraction diffractometer direct geometry distribution dose E₁ effective efficiency elastic electron linac energy transfer epithermal equation fast neutrons figure of merit fission function given gives Harwell hydrogen incident beam incident energy incident flight path incident neutron intensity k₁ L₁ linac magnetic Maxwellian measured neutron beam neutron scattering neutron source nuclear nuclei phonon polarization proton pulse width pulsed neutron pulsed reactor pulsed source Q values Qmax radiation range ratio reciprocal lattice reciprocal space reflector resolution element resonance rotor sample scattered flight path scattering angle scattering length scattering vector Section shielding shown in figure shows single crystal slit solid angle spallation spectrometer spectrum spin target thermal thickness time-of-flight transmission typical vanadium velocity vibrational wave-vector wavelength y-rays Δι ΦΩ
References to this book
Polymers and Neutron Scattering Julia S. Higgins,Henri C. Benoît,Henri Benoît No preview available - 1996 |