Compton scatter profiles for warm dense matter

Sahoo, Sudhakar; Gribakin, G. F.; Naz, Ghazala; Kohanoff, Jorge; Riley, David

doi:10.1103/physreve.77.046402

Cited by 29 publications

(45 citation statements)

References 28 publications

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“…5,6 In recent years, this technique has been applied to the study of many "disordered" systems; [7][8][9][10][11] nevertheless, its main field of application still remains that of crystalline compounds, whose intrinsic anisotropy constitutes a source of additional information. [12][13][14][15][16][17] The importance of comparing accurate experimental and theoretical EMDs is clear from the above: this is precisely the aim of this study, which concerns the prototypical case of crystalline silicon.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced transitions in solid nitrogen: Role of dispersive interactions

et al. 2011

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Availability: This is the author's manuscriptCompton profiles of crystalline silicon with a high statistical accuracy and high-resolution (0.11 a.u. in full width at half-maximum) are measured along the three main crystallographic directions and are compared to the predictions of ab initio simulations performed at different levels of theory, within and beyond one-electron approximations. The analysis of the Fourier transform of the Compton profiles reveals the failure of the density matrix extracted from single-determinantal models in reproducing some fine features of the electron momentum density of crystalline materials that can be attributed to the instantaneous Coulomb correlation of the electronic motions. The use of a post-Hartree-Fock periodic scheme allows such features to be satisfactorily reproduced.

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Section: Introductionmentioning

confidence: 99%

Pressure-induced transitions in solid nitrogen: Role of dispersive interactions

et al. 2011

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“…Unprecedentedly ultraintense x-ray pulses enable us to study nonlinear x-ray physics [13,14,15,16], including nonlinear two-photon x-ray Compton scattering [17,18]. The features of ultraintense and ultrashort XFEL pulses are useful to create warm dense matter [19], and the inelastic x-ray scattering technique has been developed to measure characteristics (density and temperature) of high energy density plasma [20,21,22,23]. One of the most prominent applications of XFELs is x-ray imaging of biological macromolecules at atomic resolution [24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Compton spectra of atoms at high x-ray intensity

Son

Geffert

Santra

2017

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Compton scattering is the nonresonant inelastic scattering of an xray photon by an electron and has been used to probe the electron momentum distribution in gas-phase and condensed-matter samples. In the low x-ray intensity regime, Compton scattering from atoms dominantly comes from bound electrons in neutral atoms, neglecting contributions from bound electrons in ions and free (ionized) electrons. In contrast, in the high x-ray intensity regime, the sample experiences severe ionization via x-ray multiphoton multiple ionization dynamics. Thus, it becomes necessary to take into account all the contributions to the Compton scattering signal when atoms are exposed to high-intensity x-ray pulses provided by x-ray free-electron lasers (XFELs). In this paper, we investigate the Compton spectra of atoms at high xray intensity, using an extension of the integrated x-ray atomic physics toolkit, xatom.As the x-ray fluence increases, there is a significant contribution from ionized electrons to the Compton spectra, which gives rise to strong deviations from the Compton spectra of neutral atoms. The present study provides not only understanding of the fundamental XFEL-matter interaction but also crucial information for single-particle imaging experiments, where Compton scattering is no longer negligible.

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“…It is based on a chemical picture of atoms, where bound states have welldefined energies and are well-separated from free electrons. This formal separation allows the use of a separated form for the scattering signal proposed by Chihara [17,24,25]:…”

Section: Description Of Modelsmentioning

confidence: 99%

“…Gregori's code was obtained and used to help design experiments to be fielded on Z and ZBeamlet. We have also pursued development of an independent theoretical code, following and extending work done on quantum mechanical approaches to scattering by Eisenberger [26,27], Sahoo [25] and Johnson [28]. Instead of basing these scattering calculations on a chemical picture of the atoms parameterized by Z f , this approach uses the wavefunctions generated by a self-consistent-field atomic model to calculate directly the quantum mechanical scattering cross sections.…”

Section: Description Of Modelsmentioning

confidence: 99%

X-ray thomson scattering measurements of warm dense matter.

Bailey¹,

Ao²,

Harding³

et al. 2012

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Warm dense matter exists at the boundary between traditional condensed matter and plasma physics and poses significant challenges to theoretical understanding. It is also critical for applications, including z-pinch and inertial fusion laboratory experiments and in astrophysical objects such as white dwarfs and giant planet interiors. The modern generation of high energy density facilities has made it possible to create warm dense conditions in the laboratory. Creating warm dense matter is challenging, but thorough understanding also requires accurate detailed diagnostics. This report describes research aimed at combining x-ray Thomson scattering, a powerful diagnostic for warm dense matter, with extreme environments created at the Z facility. Significant advances in in-house Sandia capability have been achieved, including x-ray scattering theory, instrumentation, and experiment design, execution, and interpretation. This work has set the stage for novel x-ray scattering investigations of warm dense matter at the Z facility in the near future.4

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Compton scatter profiles for warm dense matter

Cited by 29 publications

References 28 publications

Pressure-induced transitions in solid nitrogen: Role of dispersive interactions

Pressure-induced transitions in solid nitrogen: Role of dispersive interactions

Compton spectra of atoms at high x-ray intensity

X-ray thomson scattering measurements of warm dense matter.

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