Electronic structure of warm dense silicon dioxide

Engelhorn, K.; Recoules, V.; Cho, B. I.; Barbrel, B.; Mazevet, S.; Krol, Denise M.; Falcone, R. W.; Heimann, Philip

doi:10.1103/physrevb.91.214305

Cited by 18 publications

(12 citation statements)

References 37 publications

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“…This measurement was compared with EOS models used to determine the structural properties of both terrestrial and icy giant planets with abundance of complex silicates where the dissociation and metallization of SiO 2 are of great interest. A similar experiment was carried out at the Advanced Light Source synchrotron by Engelhorn et al on SiO 2 isochorically heated by a short-pulse laser [182] .…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 86%

Experimental methods for warm dense matter research

Falk

2018

High Pow Laser Sci Eng

112

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The study of structure, thermodynamic state, equation of state (EOS) and transport properties of warm dense matter (WDM) has become one of the key aspects of laboratory astrophysics. This field has demonstrated its importance not only concerning the internal structure of planets, but also other astrophysical bodies such as brown dwarfs, crusts of old stars or white dwarf stars. There has been a rapid increase in interest and activity in this field over the last two decades owing to many technological advances including not only the commissioning of high energy optical laser systems, z-pinches and X-ray free electron lasers, but also short-pulse laser facilities capable of generation of novel particle and X-ray sources. Many new diagnostic methods have been developed recently to study WDM in its full complexity. Even ultrafast nonequilibrium dynamics has been accessed for the first time thanks to subpicosecond laser pulses achieved at new facilities. Recent years saw a number of major discoveries with direct implications to astrophysics such as the formation of diamond at pressures relevant to interiors of frozen giant planets like Neptune, metallic hydrogen under conditions such as those found inside Jupiter’s dynamo or formation of lonsdaleite crystals under extreme pressures during asteroid impacts on celestial bodies. This paper provides a broad review of the most recent experimental work carried out in this field with a special focus on the methods used. All typical schemes used to produce WDM are discussed in detail. Most of the diagnostic techniques recently established to probe WDM are also described. This paper also provides an overview of the most prominent examples of these methods used in experiments. Even though the main emphasis of the publication is experimental work focused on laboratory astrophysics primarily at laser facilities, a brief outline of other methods such as dynamic compression with z-pinches and static compression using diamond anvil cells (DAC) is also included. Some relevant theoretical and computational efforts related to WDM and astrophysics are mentioned in this review.

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Section: X-ray Absorption Spectroscopymentioning

confidence: 86%

Experimental methods for warm dense matter research

Falk

2018

High Pow Laser Sci Eng

112

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“…Models still need improvements in order to describe in detail the changes in the XANES spectra, mainly because the time resolution of these experiments was intrinsically limited by the X-ray probe duration. Ultrafast X-ray absorption experiments done at the Advanced Light Source synchrotron radiation facility have unraveled the electronic structure of warm dense Copper and Silicon dioxide [270,271], but they required specific techniques to reduce the synchrotron pulse duration that are not practical or efficient. XANES experiments using the XFEL beam as a probe for shocked compressed matter were performed at LCLS-MEC near the Molybdenum LIII edge (2.520 keV) [272], and the iron K-edge [273].…”

Section: Electron-ion Thermalization In Warm Dense Mattermentioning

confidence: 99%

Applications of laser wakefield accelerator-based light sources

Albert

Thomas

2016

Plasma Phys. Control. Fusion

271

132

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Laser-wakefield accelerators (LWFAs) were proposed more than three decades ago, and while they promise to deliver compact, high energy particle accelerators, they will also provide the scientific community with novel light sources. In a LWFA, where an intense laser pulse focused onto a plasma forms an electromagnetic wave in its wake, electrons can be trapped and are now routinely accelerated to GeV energies. From terahertz radiation to gamma-rays, this article reviews light sources from relativistic electrons produced by LWFAs, and discusses their potential applications. Betatron motion, Compton scattering and undulators respectively produce X-rays or gamma-rays by oscillating relativistic electrons in the wakefield behind the laser pulse, a counterpropagating laser field, or a magnetic undulator. Other LWFA-based light sources include bremsstrahlung and terahertz radiation. We first evaluate the performance of each of these light sources, and compare them with more conventional approaches, including radio frequency accelerators or other laser-driven sources. We have then identified applications, which we discuss in details, in a broad range of fields: medical and biological applications, military, defense and industrial applications, and condensed matter and high energy density science.

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“…Figure 4 shows the O K XANES spectra for the investigated SiNW arrays and comparison with the XANES O K spectrum for the 40 nm thermally grown SiO 2 reference film. The lowest energy feature at ~533 eV originates from the silicon oxide irregularities compared with the stoichiometric SiO 2 30,31 . This feature is more pronounced for both “initial” SiNW arrays (15 and 45), e.g.…”

Section: Resultsmentioning

confidence: 99%

Surface deep profile synchrotron studies of mechanically modified top-down silicon nanowires array using ultrasoft X-ray absorption near edge structure spectroscopy

Turishchev

Parinova

Pisliaruk

et al. 2019

Sci Rep

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Atomic, electronic structure and composition of top-down metal-assisted wet-chemically etched silicon nanowires were studied by synchrotron radiation based X-ray absorption near edge structure technique. Local surrounding of the silicon and oxygen atoms in silicon nanowires array was studied on as-prepared nanostructured surfaces (atop part of nanowires) and their bulk part after, first time applied, in-situ mechanical removal atop part of the formed silicon nanowires. Silicon suboxides together with disturbed silicon dioxide were found in the composition of the formed arrays that affects the electronic structure of silicon nanowires. The results obtained by us convincingly testify to the homogeneity of the phase composition of the side walls of silicon nanowires and the electronic structure in the entire length of the nanowire. The controlled formation of the silicon nanowires array may lead to smart engineering of its atomic and electronic structure that influences the exploiting strategy of metal-assisted wet-chemically etched silicon nanowires as universal matrices for different applications.

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Electronic structure of warm dense silicon dioxide

Cited by 18 publications

References 37 publications

Experimental methods for warm dense matter research

Experimental methods for warm dense matter research

Applications of laser wakefield accelerator-based light sources

Surface deep profile synchrotron studies of mechanically modified top-down silicon nanowires array using ultrasoft X-ray absorption near edge structure spectroscopy

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