Use of resonance epithermal neutron scattering for the study of condensed matter

Thesis/Dissertation · Sun Dec 31 23:00:00 EST 1978

OSTI ID:6181948

Word, R E

Resonant epithermal neutron scattering studies provide a new regime for the study of the properties of condensed matter. The differenital scattering cross section is developed in a resonant correlation function formalism involving the positions of two scattering centers at four different times. The resonant correlation functions contain information which cannot be obtained from a study of the Van Hove correlation functions for thermal neutron scattering, and these resonant correlation functions enable one to observe phenomena which are beyond neutron scattering. It is shown that the lowest order correction to the short collision time limit yields a force density correlation function. Resonant neutron scattering provides a means of determining the amplitudes of specific anharmonic phonon interactions of cubic order. When this method is turned to the study of diffusion, one obtains higher order diffusive propagators which give the conditional probabilities for diffusion over two distinct intervals of time. The resonant selection of virtual excited states enables one to observe the diffusion of molecules in definite states of vibrational excitation.

• OSTI ID: 6181948
• Country of Publication: United States
• Language: English

Related Subjects

645500* -- High Energy Physics-- Scattering Theory-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CORRELATION FUNCTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIFFUSION
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
FERMIONS
FUNCTIONS
HADRONS
INELASTIC SCATTERING
MOLECULES
NEUTRONS
NUCLEONS
PHONONS
QUASI PARTICLES
RESONANCE SCATTERING
SCATTERING
THERMAL NEUTRONS
VIBRATIONAL STATES