Compton scattering of 279.2-keV<i>γ</i>rays by<i>K</i>-shell electrons

Basavaraju, G.; Kane, P.P.; George, S.

doi:10.1103/physreva.36.655

Cited by 19 publications

(3 citation statements)

References 34 publications

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“…Low-energy continua have been unambiguously observed, whose dramatic changes in shape and intensity follow qualitatively those of Raman-Compton profiles, a fact which cannot be attributed, as discussed above, to any bremsstrahlung or experimental effects. These continua, whose absolute intensities are in rough agreement with theory, are, however, much broader than theoretically predicted, as in the case of K scattering 8,9 for thick targets, a fact that cannot be explained for the moment, and that cannot be attributed to any outermost-shell effect (M) whose intensity has been previously studied by Kodre and Shafroth. 10 Details on theoretical calculations, polarization effects, absolute cross-section measurements, and the effect of outermost electrons will be soon presented in a more exhaustive paper on Raman-Compton scattering.…”

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confidence: 63%

Infrared divergence of the resonant Raman-Compton scattering

et al. 1989

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The infrared divergence of the resonant Raman-Compton scattering has been studied in collisions of photons on atomic L electrons in the intermediate-momentum-transfer regime. Low-energy continua emitted by Zr atoms, excited, in the vicinity of the K edge, by the monochromatized x rays delivered by the LURE Synchrotron Radiation Facility, have been observed on very thin targets and compared with the theoretically predicted infrared divergence of the Raman scattering. The characteristic change in shape of these continua has been studied over a wide energy range below the Zr K edge.PACS numbers: 32.80. Cy, 32.30.Rj While the Raman scattering in molecules is a wellknown effect and a well-established technique, this process has only very recently be considered in the x-ray regime where inner-core excitations are involved. In such a case, where autoionizing levels are considered, this process exhibits a very different behavior, allowing the study of new effects through some yet unconsidered terms of the theory. In this process, schematically described in Fig. 1, an incoming photon hv\ is inelastically scattered by an atom, which is excited in the final state of the collision. When the intermediate (virtual) state V is close to a discrete (real) level, this process is resonant. When considering inner-core excitation, two decay processes of the virtual level may be taken into account: (a) The first is the well-known Raman scattering [ Fig. 1(a)] where the target atom is excited, and the incoming photon scattered at a lower energy. This process, in which a monoenergetic scattered line is emitted, has only quite recently been observed on an atomic discrete level. x This process is resonant on both sides of the discrete level; in the final state the atom is excited, with an L electron being promoted to an empty outermost level, (b) The second is the Raman-Compton scattering [ Fig. 1 (b)] where, in the decay channel, the available energy is shared between a photon and an electron (autoionizing level); continuum photon (and electron) energy spectra are then observed, (Is) ionization limit V hv r (ls)(np) hv. (2p)~ (np) hv~ hv. (2p) (a) Raman (b) Raman-Compton FIG. 1. Resonant Raman-Compton effect: (a) Raman scattering (inelastic scattering of a photon) and (b) RamanCompton scattering (the energy given to the atom is, in the final state, shared between an electron and a photon).whose maximum energy edges are equal to the total available energy («Av/-2^). This process is then asymmetrically resonant near the ionization energy level (the energy difference between the virtual level and the U ionization limit will be denoted by e), and in the final state the atom is ionized in the L shell.The virtual level decays by either (a) or (b). In the case of solid targets where the outermost excited electrons are not located in discrete energy states but in broad bands, these two processes cannot be experimentally separated and only complex continuum spectra are observed.In the example considered in Fig. 1, which is among the most typic...

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confidence: 63%

Infrared divergence of the resonant Raman-Compton scattering

et al. 1989

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“…Limited by the scope of this work, only a few representative examples are presented. For more examples, the readers can resort to references [28,36,57,[79][80][81][82][83][84][85].…”

Section: Comparisons Between Theoretical Calculations and Experimenta...mentioning

confidence: 99%

“…For this reason, it is not that valuable to plot the In the subfigure (a), the SM result is calculated by Bergstrom et al [54], the RIA result is given by Qiao et al [42], and experimental measurements are given by Rullhusen and Schumacher [83]. In the subfigures (b) and (c), the theoretical SM results are given through combined works of Bergstrom et al and Gavrila [28,63], the RIA result is given by Bergstrom et al [28], and the experimental measurements are given by Basavaraju et al [84] and Manninen et al [85], respectively. In subfigure (c), the LET results are calculated by Bergstrom et al [28].…”

Section: Comparisons Between Theoretical Calculations and Experimenta...mentioning

confidence: 99%

An Overview of the Compton Scattering Calculation

2021

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The Compton scattering process plays significant roles in atomic and molecular physics, condensed matter physics, nuclear physics and material science. It could provide useful information on the electromagnetic interaction between light and matter. Several aspects of many-body physics, such us electronic structures, electron momentum distributions, many-body interactions of bound electrons, etc., can be revealed by Compton scattering experiments. In this work, we give a review of ab initio calculation of Compton scattering process. Several approaches, including the free electron approximation (FEA), impulse approximation (IA), incoherent scattering function/incoherent scattering factor (ISF) and scattering matrix (SM) are focused on in this work. The main features and available ranges for these approaches are discussed. Furthermore, we also briefly introduce the databases and applications for Compton scattering.

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Compton profile study of tin

Ahuja

Khera

Mathur

et al. 2006

Physica Status Solidi (b)

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In this paper we report the Compton profile of β-tin, measured at an intermediate resolution, using 661.65-keV γ-radiation from a 137 Cs source. We have also computed the Compton profiles for α-and β-tin using the CRYSTAL03 code. The Compton profiles within the framework of linear combination of atomic orbitals (LCAO) using Hartree -Fock (HF), density functional (DF) and pseudopotential-HF schemes embodied in the CRYSTAL03 code have been reported for both phases. Good accordance of the experiment for β-tin with the corresponding theoretical profiles has been observed for the LCAO-HF and DF schemes. A real-space analysis of the experimental Compton profile shows the metal-like behavior of β-tin.

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Compton scattering of 279.2-keVγrays byK-shell electrons

Abstract: Coincidence techniques have been employed in a detailed study of Compton scattering of 279.2-keV y rays by K-shell electrons of tin and gold. Double-differential

Cited by 19 publications

References 34 publications

Infrared divergence of the resonant Raman-Compton scattering

Infrared divergence of the resonant Raman-Compton scattering

An Overview of the Compton Scattering Calculation

Compton profile study of tin

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