X-ray scattering from K-shell electrons at intermediate momentum transfer
The inelastic scattering of x rays from K-shell electrons has been investigated for momentum transfers which are approximately equal to the initial state electronic momenta. Spectra of x rays scattered from a copper foil were measured with a fluorescence-coincidence technique for incident x-ray energies of 70 and 62 keV. The fluorescence-coincidence technique isolated those x rays scattered from the K-shell by detecting scattered x rays in coincidence with K-shell fluorescence x rays. Inelastic scattering spectra calculated with a non-relativistic one-electron model were in good agreement in both spectral shape and absolute scattering strength with the experimental spectra for final x-ray energies above 35 keV. Below this energy has found that secondary x-ray emission processes dominated the signal measured with the coincidence technique. Secondary x-ray emission processes are those which involve more than one copper atom and are primarily a result of x-ray emission by photo-electrons created in the foil target by the incident beam. The author presents here estimates of the strength of these secondary emission processes as function of sample thickness. These estimates are important in interpreting results of measurements of the inelastic scattering cross section in the spectral region where the final x-ray energy is much smaller than the incident energy, a region in which the cross section is expected to diverge. The use of the fluorescence-coincidence motivated a theoretical study of parametric scattering, an x-ray process in which two emitted x rays carry off all of the incident x-ray energy and no energy is lost to a recoil electron or atomic excitation.
- Research Organization:
- David Taylor Model Basin, Carderock, MD (USA)
- OSTI ID:
- 6091637
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
PHOTON COLLISIONS
PHOTONS
COLLISIONS
COINCIDENCE METHODS
ELECTRONS
ENERGY LEVELS
FLUORESCENCE
FOILS
INELASTIC SCATTERING
MOMENTUM TRANSFER
PHOTON EMISSION
SURFACES
THICKNESS
X RADIATION
X-RAY SPECTRA
COUNTING TECHNIQUES
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
FERMIONS
IONIZING RADIATIONS
LEPTONS
LUMINESCENCE
MASSLESS PARTICLES
METALS
RADIATIONS
SCATTERING
SPECTRA
TRANSITION ELEMENTS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)