Inelastic scattering of X-rays and gamma rays by inner shell electrons

Kane, P.P.

doi:10.1016/0370-1573(92)90050-a

Cited by 102 publications

(55 citation statements)

References 311 publications

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“…This is of advantage in cases where the coherent-elastic scattering process (Rayleigh scattering) is discussed together with the incoherent scattering process (also called Compton Scattering), where one bound electron is ejected from the electron cloud into the continuum. This process then resembles the one discovered by Compton [1] except for the appearance of binding effects [3]. The term Raman scattering is used in the case where the atom or nucleus does not return to the initial state but no particle emission is taking place.…”

Section: Introductionmentioning

confidence: 77%

“…Irrespective of this, there seems to be a conservation of the integrated photoabsorption strength when going from free to bound nucleons [147]. 3 He (open circles) and 4 He (grey squares) [146]. The solid line represents the universal curve for complex nuclei.…”

Section: Photoabsorption By the Nucleusmentioning

confidence: 99%

“…The Ansatz (4.20) implies that we attributed an electric dipole characteristic to this high-energy limit. 3 In section 8 the properties of Eq. (4.20) are discussed within the framework of fixed-t dispersion relations.…”

Section: The Interpolation Betweenmentioning

confidence: 99%

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Compton scattering by nuclei

et al. 2000

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The concept of Compton scattering by even-even nuclei from giant-resonance to nucleon-resonance energies and the status of experimental and theoretical researches in this field are outlined. The description of Compton scattering by nuclei starts from different complementary approaches, namely from second-order S-matrix and from dispersion theories. Making use of these, it is possible to incorporate into the predicted nuclear scattering amplitudes all the information available from other channels, viz. photon-nucleon and photon-meson channels, and to efficiently make use of models of the nucleon, the nucleus and the nucleon-nucleon interaction. The total photoabsorption cross section constrains the nuclear scattering amplitude in the forward direction. The specific information obtained from Compton scattering therefore stems from the angular dependence of the nuclear scattering amplitude, providing detailed insight into the dynamics of the nuclear and nucleon degrees of freedom and into the interplay between them. Nuclear Compton scattering in the giant-resonance energy-region provides information on the dynamical properties of the in-medium mass of the nucleon. Most prominently, the electromagnetic polarizabilities of the nucleon in the nuclear medium can be extracted from nuclear Compton scattering data obtained in the quasideuteron energy-region. In our description of this latter process special emphasis is laid upon the exploration of many-body and two-body effects entering into the nuclear dynamics. Recent results are presented for two-body effects due to the mesonic seagull amplitude and due to the excitation of nucleon internal degrees of freedom accompanied by meson exchanges. Due to these studies the inmedium electromagnetic polarizabilities are by now well understood, whereas the understanding of nuclear Compton scattering in the ∆-resonance range is only at the beginning. Furthermore, phenomenological methods how to include retardation effects in the scattering amplitude are discussed and compared with model predictions.

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Section: Introductionmentioning

confidence: 77%

Section: Photoabsorption By the Nucleusmentioning

confidence: 99%

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Compton scattering by nuclei

et al. 2000

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“…The MO calculations for the HF molecule are performed for the equilibrium distance between the nuclei of hydrogen atoms and fluorine R 0 = 1.733 a.u. [35].…”

Section: Resultsmentioning

confidence: 99%

Iteration Scheme for Solving the System of Coupled Integro-Differential Equations for Excited and Ionized States of Molecular Systems

2017

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Investigation of the interaction of electromagnetic radiation with molecular systems provides most of the information on their structure and properties. Interpretation of experimental data is directly determined by the knowledge of the structure of energy levels and its change in the transition of these systems to an excited state. A key task of the methods for calculating the molecular orbitals of excited states is to accurately describe the emerging vacancies of the molecular core, leading to radial relaxation of the electron density. We propose an iterative scheme for solving a system of coupled integro-differential equations for obtaining molecular orbitals of electron configurations with excited/ionized deep and subvalent shells in a single-center representation. The numerical procedure of the iterative scheme is reduced to solving a boundary value problem based on a combination of the three-point difference scheme of Numerov and Thomas algorithm. To increase the rate of convergence of the computational procedure, an accurate account is taken of the behavior of the electron density near the nuclei of the molecular system. The realization of the algorithm of the computational scheme is considered on the example of a diatomic hydrogen fluoride molecule. The energy characteristics of the ground and ionized states of the molecule are estimated, and also the spatial distribution of the electron density is presented for the example of the σ-symmetry shell.

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“…The scattering experiments were conducted in a reflection geometry arrangement (Kane, 1992) by allowing 59.54 keV g-rays from 300 mCi 241 Am to undergo incoherent scattering by the scatterer foils. Thin elemental foils of six rare earth elements Pr, Sm, Gd, Dy, Ho and Yb were used as scatterers.…”

Section: Methodsmentioning

confidence: 99%