Log in

Relevant bibliographies by topics / Nonlinear x-ray physics / Journal articles

Journal articles on the topic 'Nonlinear x-ray physics'

To see the other types of publications on this topic, follow the link: Nonlinear x-ray physics.

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Nonlinear x-ray physics.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Eichmann, U., H. Rottke, S. Meise, J. E. Rubensson, J. Söderström, M. Agåker, C. Såthe, et al. "Photon-recoil imaging: Expanding the view of nonlinear x-ray physics." Science 369, no. 6511 (September 24, 2020): 1630–33. http://dx.doi.org/10.1126/science.abc2622.

Full text

Abstract:

Addressing the ultrafast coherent evolution of electronic wave functions has long been a goal of nonlinear x-ray physics. A first step toward this goal is the investigation of stimulated x-ray Raman scattering (SXRS) using intense pulses from an x-ray free-electron laser. Earlier SXRS experiments relied on signal amplification during pulse propagation through dense resonant media. By contrast, our method reveals the fundamental process in which photons from the primary radiation source directly interact with a single atom. We introduce an experimental protocol in which scattered neutral atoms rather than scattered photons are detected. We present SXRS measurements at the neon K edge and a quantitative theoretical analysis. The method should become a powerful tool in the exploration of nonlinear x-ray physics.

APA, Harvard, Vancouver, ISO, and other styles

2

Rohringer, Nina. "X-ray Raman scattering: a building block for nonlinear spectroscopy." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (April 2019): 20170471. http://dx.doi.org/10.1098/rsta.2017.0471.

Full text

Abstract:

Ultraintense X-ray free-electron laser pulses of attosecond duration can enable new nonlinear X-ray spectroscopic techniques to observe coherent electronic motion. The simplest nonlinear X-ray spectroscopic concept is based on stimulated electronic X-ray Raman scattering. We present a snapshot of recent experimental achievements, paving the way towards the goal of realizing nonlinear X-ray spectroscopy. In particular, we review the first proof-of-principle experiments, demonstrating stimulated X-ray emission and scattering in atomic gases in the soft X-ray regime and first results of stimulated hard X-ray emission spectroscopy on transition metal complexes. We critically asses the challenges that have to be overcome for future successful implementation of nonlinear coherent X-ray Raman spectroscopy. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

APA, Harvard, Vancouver, ISO, and other styles

3

NAZARKIN, A., I. USCHMANN, E. FÖRSTER, and R. SAUERBREY. "NONLINEAR OPTICS WITH HARD X-RAYS: HARMONIC GENERATION AND RAMAN SCATTERING IN PERFECT CRYSTALS." Modern Physics Letters B 20, no. 08 (March 30, 2006): 385–400. http://dx.doi.org/10.1142/s0217984906010834.

Full text

Abstract:

Based on dynamical diffraction theory, we study nonlinear processes in the hard X-ray region. First, we consider the process of frequency doubling in perfect crystals in the general case where the process of Bragg rescattering of the generated harmonic field should be taken into account. The optimum conversion conditions for the Bragg and Laue interaction geometry are determined and the efficiency is calculated. Secondly, we consider the modulation of X-ray diffraction by a wave of coherent optical phonons produced by an intense laser pulse. We show that in the optimum regime the modulation period of the X-ray beam may be even shorter than the period of the excited optical phonons, as a result of higher order Raman scattering. Generation of extremely short X-ray pulses using this technique is discussed. Our results suggest that synchronous interaction schemes analogous to the schemes long known in nonlinear optics can significantly increase the efficiency of nonlinear processes in the hard X-ray region.

APA, Harvard, Vancouver, ISO, and other styles

4

Blumensath, Thomas, and Richard Boardman. "Non-convexly constrained image reconstruction from nonlinear tomographic X-ray measurements." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2043 (June 13, 2015): 20140393. http://dx.doi.org/10.1098/rsta.2014.0393.

Full text

Abstract:

The use of polychromatic X-ray sources in tomographic X-ray measurements leads to nonlinear X-ray transmission effects. As these nonlinearities are not normally taken into account in tomographic reconstruction, artefacts occur, which can be particularly severe when imaging objects with multiple materials of widely varying X-ray attenuation properties. In these settings, reconstruction algorithms based on a nonlinear X-ray transmission model become valuable. We here study the use of one such model and develop algorithms that impose additional non-convex constraints on the reconstruction. This allows us to reconstruct volumetric data even when limited measurements are available. We propose a nonlinear conjugate gradient iterative hard thresholding algorithm and show how many prior modelling assumptions can be imposed using a range of non-convex constraints.

APA, Harvard, Vancouver, ISO, and other styles

5

Kettle, B., A. Aquila, S. Boutet, P. H. Bucksbaum, G. Carini, Y. Feng, E. Gamboa, et al. "Anomalous two-photon Compton scattering." New Journal of Physics 23, no. 11 (November 1, 2021): 115008. http://dx.doi.org/10.1088/1367-2630/ac3553.

Full text

Abstract:

Abstract X-ray free-electron lasers can generate radiation pulses with extreme peak intensities at short wavelengths. This enables the investigation of laser–matter interactions in a regime of high fields, yet at a non-relativistic ponderomotive potential, where ordinary rules of light–matter interaction may no longer apply and nonlinear processes are starting to become observable. Despite small cross-sections, first nonlinear effects in the hard x-ray regime have recently been observed in solid targets, including x-ray-optical sum-frequency generation (XSFG), x-ray second harmonic generation (XSHG) and two-photon Compton scattering (2PCS). Nonlinear interactions of bound electrons in the x-ray range are fundamentally different from those dominating at optical frequencies. Whereas in the optical regime nonlinearities are predominantly caused by anharmonicities of the atomic potential in the chemical bonds, x-ray nonlinearities far above atomic resonances are expected to be due to nonlinear oscillations of quasi-free electrons, including inner-shell atomic electrons. While the quasi-free-electron model agrees reasonably well with the experimental data for XSFG and XSHG, 2PCS measurements have led to unexpected results: the energy of the nonlinearly scattered photons from non-relativistic electrons shows a substantial unexpected red shift in addition to the Compton shift that is well beyond that predicted by a nonlinear quantum electrodynamics model for free electrons. A potential explanation for the spectral broadening is based on a previously unexplored scattering process that involves the whole atom rather than just quasi-free electrons. A first simulation that includes the atomic binding potential was successful in describing a broadening of the spectrum of the nonlinearly scattered photons to longer wavelengths for soft x-rays. However, the same model does not show any broadening at hard x-ray wavelengths, which is in agreement with other simulation approaches. To this point no calculation has been able to reproduce the experimentally observed broadening. Here we present further experimental data of 2PCS for an extended parameter range using additional diagnostics. In particular, we present measurements of the electron momentum distribution during the interaction that strongly suggest that the spectral broadening is not caused by an increased plasma temperature. We extend our measurement of the magnitude of the red shift in beryllium to 1.9\enspace \mathrm{k}\mathrm{e}\mathrm{V}$?> > 1.9 k e V in addition to the Compton shift expected for free electrons and expand the measurement of the angular distribution to include forward scattering angles. We also present first measurements of 2PCS from diamond.

APA, Harvard, Vancouver, ISO, and other styles

6

Chakraborty, B., AK Sur, and SN Paul. "Nonlinear Instability of Ion-cyclotron Whistlers in the Ionosphere." Australian Journal of Physics 41, no. 1 (1988): 100. http://dx.doi.org/10.1071/ph880100.

Full text

Abstract:

The papers in this special issue of the Australian Journal of Physics were presented at an International Symposium on X-ray Powder Diffractometry in Fremantle, Western Australia, in August 1987. The Symposium, with 160 participants, followed the Fourteenth Congress of the International Union of Crystallography in Perth.

APA, Harvard, Vancouver, ISO, and other styles

7

Maksimenko, Anton. "Nonlinear extension of the x-ray diffraction enhanced imaging." Applied Physics Letters 90, no. 15 (April 9, 2007): 154106. http://dx.doi.org/10.1063/1.2721378.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Wang, Bo, Yu-Ting Wang, Fu-Ting Yi, Tian-Chong Zhang, Jing Liu, and Yue Zhou. "Fabrication of absorption gratings with X-ray lithography for X-ray phase contrast imaging." International Journal of Modern Physics B 32, no. 13 (May 11, 2018): 1850163. http://dx.doi.org/10.1142/s0217979218501631.

Full text

Abstract:

Grating-based X-ray phase contrast imaging is promising especially in the medical area. Two or three gratings are involved in grating-based X-ray phase contrast imaging in which the absorption grating of high-aspect-ratio is the most important device and the fabrication process is a great challenge. The material with large atomic number Z is used to fabricate the absorption grating for excellent absorption of X-ray, and Au is usually used. The fabrication process, which involves X-ray lithography, development and gold electroplating, is described in this paper. The absorption gratings with 4 [Formula: see text]m period and about 100 [Formula: see text]m height are fabricated and the high-aspect-ratio is 50.

APA, Harvard, Vancouver, ISO, and other styles

9

Bennett, Kochise, Yu Zhang, Markus Kowalewski, Weijie Hua, and Shaul Mukamel. "Multidimensional resonant nonlinear spectroscopy with coherent broadband x-ray pulses." Physica Scripta T169 (June 16, 2016): 014002. http://dx.doi.org/10.1088/0031-8949/t169/1/014002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Shkolnikov, P. L., and A. E. Kaplan. "Feasibility of x-ray resonant nonlinear effects in plasmas." Optics Letters 16, no. 15 (August 1, 1991): 1153. http://dx.doi.org/10.1364/ol.16.001153.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Zhao, Qile, Xu Ma, Angela Cuadros, Tianyi Mao, and Gonzalo R. Arce. "Single-snapshot X-ray imaging for nonlinear compressive tomosynthesis." Optics Express 28, no. 20 (September 18, 2020): 29390. http://dx.doi.org/10.1364/oe.392054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Conti, C., A. Fratalocchi, G. Ruocco, and F. Sette. "Nonlinear optics in the X-ray regime: nonlinear waves and self-action effects." Optics Express 16, no. 12 (May 23, 2008): 8324. http://dx.doi.org/10.1364/oe.16.008324.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Dzelzainis, T., G. Nersisyan, D. Riley, L. Romagnani, H. Ahmed, A. Bigongiari, M. Borghesi, et al. "The TARANIS laser: A multi-Terawatt system for laser-plasma investigations." Laser and Particle Beams 28, no. 3 (July 30, 2010): 451–61. http://dx.doi.org/10.1017/s0263034610000467.

Full text

Abstract:

AbstractThe multi-Terawatt laser system, terawatt apparatus for relativistic and nonlinear interdisciplinary science, has been recently installed in the Centre for Plasma Physics at the Queen's University of Belfast. The system will support a wide ranging science program, which will include laser-driven particle acceleration, X-ray lasers, and high energy density physics experiments. Here we present an overview of the laser system as well as the results of preliminary investigations on ion acceleration and X-ray lasers, mainly carried out as performance tests for the new apparatus. We also discuss some possible experiments that exploit the flexibility of the system in delivering pump-probe capability.

APA, Harvard, Vancouver, ISO, and other styles

14

Basor, Estelle L., and Yang Chen. "The x-ray problem revisited." Journal of Physics A: Mathematical and General 36, no. 13 (March 19, 2003): L175—L180. http://dx.doi.org/10.1088/0305-4470/36/13/101.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Balyan, M. K. "X-ray third-order nonlinear asymmetric diffraction in the transmission geometry." Physica Scripta 96, no. 12 (September 7, 2021): 125006. http://dx.doi.org/10.1088/1402-4896/ac2186.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Cucchetti, E., M. E. Eckart, P. Peille, F. S. Porter, F. Pajot, and E. Pointecouteau. "Multi-parameter Nonlinear Gain Correction of X-ray Transition Edge Sensors for the X-ray Integral Field Unit." Journal of Low Temperature Physics 193, no. 5-6 (April 17, 2018): 931–39. http://dx.doi.org/10.1007/s10909-018-1912-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Krishna, N. Murali, Lydia S. Lingam, and Keshav N. Shrivastava. "Theory of Detection of X-Rays by Superconductors." Modern Physics Letters B 11, no. 19 (August 20, 1997): 849–59. http://dx.doi.org/10.1142/s0217984997001055.

Full text

Abstract:

Two new processes occur in a superconducting film when it is used as a detector of X-rays. One of these processes is the scattering of the X-ray by a single electron which gives rise to the broadening of the X-ray line. Another process describes the breaking of a Cooper pair by the X-ray which also contributes to the width of the X-ray. The line arising from the single electron process depends on T4 whereas that arising from the pair breaking process varies almost as T6 at low temperatures. Lines occur at ℏωq ± 2Δ, and at ℏωq where ℏωq is the energy of the X-ray and 2Δ is the gap of the superconductor.

APA, Harvard, Vancouver, ISO, and other styles

18

UESAKA, MITSURU, FUMITO SAKAMOTO, ATSUSHI FUKASAWA, HARUYUKI OGINO, TOMOHIKO YAMAMOTO, DE MENG, KATSUHIRO DOBASHI, et al. "MULTI-BEAM COMPTON SCATTERING MONOCHROMATIC TUNABLE HARD X-RAY SOURCE." International Journal of Modern Physics B 21, no. 03n04 (February 10, 2007): 559–71. http://dx.doi.org/10.1142/s0217979207042367.

Full text

Abstract:

Compton scattering hard X-ray source which consists of an X-band (11.424 GHz) electron linear accelerator and YAG laser is under construction at Nuclear Professional School, the University of Tokyo (UTNS). Monochromatic hard X-rays are required for variety of medical and biological applications. Our scheme of the hard X-ray source is to produce a monochromatic hard X-ray via collision between 35 MeV electron beam and 2.5 J/10 nsec Nd : YAG laser. In order to increase the efficiency of the X-ray yield, we adopt a laser pulse circulation system. In our case, the laser pulse circulation system can increase the X-ray intensity of up to 50 times. Main features of our scheme are to produce monochromatic tunable hard (10-40 keV) X-rays with the intensities of 108-109 photons/sec. In addition, X-ray energy can be changed with rapidly by 40 ms by introducing two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and optical switch. This quick energy change is indispensable to living specimens and very difficult by a large SR light source and others. We designed a laser pulse circulation system to increase the X-ray yield 10 times higher (up to 108 photons/RF pulse, 109 photons/sec). It can be proved that the laser total increases 10 times higher by principle experiment with lower energy laser (25 mJ/pulse). Dual-energy X-ray CT and subtraction X-ray CT are available to determine 3D distribution of atomicc number density and electron density, and specified atomic distribution, respectively. Here, the construction status of the X-band beam line and the application plan of the hard X-ray will be reported.

APA, Harvard, Vancouver, ISO, and other styles

19

SAKAI, FUMIO, TERUNOBU NAKAJYO, TATSUYA YANAGIDA, and SHINJI ITO. "A COMPACT THOMSON X-RAY SOURCE AT SHI." International Journal of Modern Physics B 21, no. 03n04 (February 10, 2007): 465–72. http://dx.doi.org/10.1142/s0217979207042252.

Full text

Abstract:

A compact, high-brightness x-ray source has been developed through Thomson scattering between photons and relativistic electrons. 33keV energy photons (maximum) were generated in a 165-degree interaction configuration with 38MeV electrons and 800nm-wavelength Ti :sapphire laser light. The number of total photons generated at an interaction point was 106 photons/pulse for a 0.8nC electron bunch charge and 150mJ laser pulse energy. In a 90-degree interaction configuration, 105 photons/pulse total photons were obtained (maximum). Transverse profiles of x-ray intensity and energy were measured by an x-ray CCD camera. These experiment profiles agreed with the analytical results. Imaging using this x-ray source was demonstrated as an application. X-ray images for some objects were taken with various lengths between the objects and the camera. As a result, the refraction contrast images were observed with 17keV x-rays.

APA, Harvard, Vancouver, ISO, and other styles

20

Moribayashi, Kengo, Takashi Kagawa, and Dong Eon Kim. "Application of x-ray nonlinear processes to the measurement of 10 fs to sub-ps of x-ray pulses." Journal of Physics B: Atomic, Molecular and Optical Physics 38, no. 13 (June 15, 2005): 2187–94. http://dx.doi.org/10.1088/0953-4075/38/13/011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Ebrahimpour, Zeinab, Marcello Coreno, Luca Giannessi, Massimo Ferrario, Augusto Marcelli, Federico Nguyen, Seyed Javad Rezvani, Francesco Stellato, and Fabio Villa. "Progress and Perspectives of Spectroscopic Studies on Carbon K-Edge Using Novel Soft X-ray Pulsed Sources." Condensed Matter 7, no. 4 (December 6, 2022): 72. http://dx.doi.org/10.3390/condmat7040072.

Full text

Abstract:

The development of novel coherent and brilliant sources, such as soft X-ray free electron laser (FEL) and high harmonic generation (HHG), enables new ultrafast analysis of the electronic and structural dynamics of a wide variety of materials. Soft X-ray FEL delivers high-brilliance beams with a short pulse duration, high spatial coherence and photon energy tunability. In comparison with FELs, HHG X-ray sources are characterized by a wide spectral bandwidth and few- to sub-femtosecond pulses. The approach will lead to the time-resolved reconstruction of molecular dynamics, shedding light on different photochemical pathways. The high peak brilliance of soft X-ray FELs facilitates investigations in a nonlinear regime, while the broader spectral bandwidth of the HHG sources may provide the simultaneous probing of multiple components. Significant technical breakthroughs in these novel sources are under way to improve brilliance, pulse duration, and to control spectral bandwidth, spot size, and energy resolution. Therefore, in the next few years, the new generation of soft X-ray sources combined with novel experimental techniques, new detectors, and computing capabilities will allow for the study of several extremely fast dynamics, such as vibronic dynamics. In the present review, we discuss recent developments in experiments, performed with soft X-ray FELs and HHG sources, operating near the carbon K-absorption edge, being a key atomic component in biosystems and soft materials. Different spectroscopy methods such as time-resolved pump-probe techniques, nonlinear spectroscopies and photoelectron spectroscopy studies have been addressed in an attempt to better understand fundamental physico-chemical processes.

APA, Harvard, Vancouver, ISO, and other styles

22

Petrosyan, A. M., S. S. Terzyan, V. M. Burbelo, and R. P. Sukiasyan. "Investigation of Some New Nonlinear Optical Crystals by Means of NQR, IR and X-Ray Diffraction Methods." Zeitschrift für Naturforschung A 53, no. 6-7 (July 1, 1998): 528–36. http://dx.doi.org/10.1515/zna-1998-6-741.

Full text

Abstract:

Abstract Some new analogues of the nonlinear optical crystal L-arginine phosphate monohydrate (LAP) (Arg • HIO3 , Arg • 2HIO3 , Lys • HIO3 , Lys • 2HIO3 , Lys • 3HIO3 , Bet • 3HIO3) were obtained and investigated by means of IR, NQR, X-ray diffraction and SHG methods. The importance of this class of crystals for revealing new nonlinear optical crystals is pointed out.

APA, Harvard, Vancouver, ISO, and other styles

23

DOLOCAN, ANDREI, and J. FRISO VAN DER VEEN. "X-RAY PROPAGATION IN TAPERED PLANAR WAVEGUIDE." International Journal of Modern Physics B 17, no. 11 (April 30, 2003): 2213–57. http://dx.doi.org/10.1142/s0217979203018156.

Full text

Abstract:

The present paper focuses on the tapered planar waveguide solution for an initial given wave form. The algorithm is constructed in distributions space such that the calculations can be actually computed by taking some hypothesis regarding the mode series which appear. The whole argument leads to the conclusion that the wave is compressed towards the waveguide in the direction of tilting, leading thereafter to a focusing phenomena. We present two alternative constructions in order to compute the convolution which gives the wave inside the waveguide. The hypothesis are providing results in good approximation with the real evolution of the field within the definition domain.

APA, Harvard, Vancouver, ISO, and other styles

24

Li, Yao, Tong Su, Lizhi Sheng, Neng Xu, and Baosheng Zhao. "Simulation and experiment of X-ray communication in re-entry dusty plasma region." Modern Physics Letters B 34, no. 04 (December 20, 2019): 2050057. http://dx.doi.org/10.1142/s0217984920500578.

Full text

Abstract:

Compared with the other wireless communication band, X-ray carrier has the merits of lower wavelength, higher frequency and photon energy, which could provide a novel method to solve the communication problems of re-entry blackout region. In this paper, transmission characteristics of X-ray carrier in the re-entry dusty plasma medium were analyzed first, simulation results indicate that dusty particles were more likely to impede the microwave signal than X-ray carrier. Then an alkali metal plasma source was designed to simulate the re-entry dusty plasma sheath for simplification. Transmission co-efficiency under different X-ray energy were tested, which pointed out that X-ray signal would obtain more than 79.4% transmission co-efficiency on condition of dynamic and dusty plasma medium. Finally, we give our proposal and potential capability of X-ray communication in the re-entry plasma condition.

APA, Harvard, Vancouver, ISO, and other styles

25

Thilak, T., M. Basheer Ahamed, and P. Murugakoothan. "Physical and optical study of potassium-doped meta-Nitroaniline crystal (mNAK)." Journal of Nonlinear Optical Physics & Materials 23, no. 01 (March 2014): 1450012. http://dx.doi.org/10.1142/s021886351450012x.

Full text

Abstract:

A nonlinear optical crystal of potassium-doped meta-Nitroaniline (mNAK) was grown by slow evaporation method using methanol as solvent. The growth mechanism was understood by chemical etching studies. The presence of potassium in the crystal was identified by energy-dispersive X-ray diffraction. Lattice parameters for the title crystal were determined by single-crystal X-ray diffraction and powder X-ray diffraction techniques, and the functional groups in the crystal were revealed by Fourier transform infrared study. Optical properties of the crystal were evaluated by UV-Vis-NIR transmission and absorption spectra in the range of 200–1000 nm. Thermal stability of the crystal was studied by thermo gravimetric analysis and differential thermal analysis. Mechanical properties of the crystal were analyzed using Vicker's microhardness technique. Second harmonic generation efficiency of the crystal was examined using pulsed Nd :YAG laser. Finally, the third-order nonlinear optical properties of the crystal were measured using single-beam Z-scan technique.

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Zhongmiao, Yuefeng Jing, Xu Kang, Tong Ding, and Jun Liu. "X-ray radiographs reconstruction based on nonlinear least squares with deconvolution." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 929 (June 2019): 134–41. http://dx.doi.org/10.1016/j.nima.2019.03.040.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

ALBERT, FELICIE, RAHUL SHAH, KIM TA PHUOC, FREDERIC BURGY, JEAN-PHILIPPE ROUSSEAU, ANTOINE ROUSSE, ALEXANDER PUKHOV, and SERGEI KISELEV. "DEVELOPMENT OF LASER BASED SYNCHROTRON X-RAY SOURCE." International Journal of Modern Physics B 21, no. 03n04 (February 10, 2007): 497–507. http://dx.doi.org/10.1142/s021797920704229x.

Full text

Abstract:

By focusing an ultraintense laser onto a helium gaz jet, a collimated beam of ultrafast broadband X-ray radiation can now be generated. The X-ray radiation results from the betatron oscillations of relativistic electrons in the laser created plasma channel. Thus, just as in a synchrotron, the spectral and flux properties of the X-ray beam can be linked to the electron beam through the plasma wiggler strength. The radiation has been observed within 1-10 keV with filters and presents a divergence of as low as 20 mrad. In addition, this source possesses the unique properties to be ultrafast and perfectly synchronized with the laser system, which opens the way toward new types of pump probe experiments.

APA, Harvard, Vancouver, ISO, and other styles

28

Tomassini, Paolo, A. Bacci, J. Cary, M. Ferrario, A. Giulietti, Danilo Giulietti, L. A. Gizzi, et al. "Linear and Nonlinear Thomson Scattering for Advanced X-ray Sources in PLASMONX." IEEE Transactions on Plasma Science 36, no. 4 (August 2008): 1782–89. http://dx.doi.org/10.1109/tps.2008.927428.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

WANG, J. T., C. ZHANG, A. FITZGERALD, Y. FU, and S. HALL. "X-RAY RADIATION EFFECTS ON THE DIELECTRIC PROPERTIES OF PZT CERAMICS." International Journal of Modern Physics B 21, no. 18n19 (July 30, 2007): 3433–36. http://dx.doi.org/10.1142/s021797920704469x.

Full text

Abstract:

We have systematically studied the X-ray radiation effects on PZT thin ceramic disk provided by CTS Communications Components, Inc using the X-ray beam line in the Center for Advanced Micro-Structure and Devices (CAMD) in Baton Rouge, Louisiana. The photo energies of the X-ray range from 2000 eV to 8000 eV. The beam size is 10.0 cm ×1.0 cm .We measure the dielectric constant in situ with different dose of the radiation in one sample and in different samples. The dielectric constants as a function of radiation dose are presented in the paper. It demonstrates the effects on the dielectric constant. Unexpectedly, we also found that X-ray radiation on the PZT disk generates charges on the surface of the samples. We measured the surface voltage due to the X-ray radiation with different radiation dose at the same temperature for these samples. This founding may have application potential for photoelectric devices. This is just a preliminary study. More thorough investigations are needed.

APA, Harvard, Vancouver, ISO, and other styles

30

CHAKRABORTY, PURUSHOTTAM. "LAYERED SYNTHETIC MICROSTRUCTURES AS OPTICAL ELEMENTS FOR THE EXTREME ULTRAVIOLET AND SOFT X-RAYS." International Journal of Modern Physics B 05, no. 13 (August 10, 1991): 2133–228. http://dx.doi.org/10.1142/s0217979291000845.

Full text

Abstract:

In recent years, the availability of intense continuous radiation sources, such as electron synchrotrons and laser-induced hot plasmas, has given rise to a renewed interest in soft x-ray and x-uv reflectivity measurements. Such studies were, for a long time, hindered because of mainly two reasons. First, it was really difficult to generate soft x-rays in the laboratories and second, there was no possibility for practical implementation and design of optical systems, such as focusing elements, mirrors, etc. associated with that particular wavelength region. Soft x-rays, with wavelength range usually from 10 to about 200 angstroms, can produce images of higher resolution than visible light due to their shorter wavelength. For years, physicists have wanted to construct an x-ray microscope that would exploit the ability of soft x-rays to detect small structures. The need for such an instrument is clear. The resolution of light microscopes is limited by the comparatively long wavelength of visible light. Although transmission electron microscopes have much higher resolution, they are weak in penetrating power and are, therefore, limited to very thin specimens. Therefore, transmission electron microscopy involves extreme care in sample preparation. Such preparations which might alter the very structure of a biological sample, would not be required in x-ray microscopy. The difficulties in constructing an x-ray microscope, however, have proved to be irresistible, because of the fact that soft x-rays cannot be brought together to form an image. In other words, soft x-rays cannot be made reflected from any known single surface at normal or near-normal incidence. The only possibility that existed until now employs grazing incidence, the only form of focusing x-ray optics. But their quality (resolution) has been limited because they must be machined in the form of a paraboloid or hyperboloid. Lenses of the kind used in ordinary optical microscopes cannot be made for use at wavelengths less than about 1000 angstroms. There are two reasons for this. First, there is only a tiny difference in the refractive indices among the different materials at soft x-ray wavelengths. Second, soft x-rays are strongly absorbed by all materials and cannot penetrate any conceivable lens, used in ordinary optical microscopes or telescopes. A major advance in x-ray optics holds a great promise both in the fields of high resolution scanning x-ray microscopy, lithography and substantial improvements in the quality of x-ray telescopes. Recent improvements in the techniques for quality control of evaporated and sputtered films have led to the interest in the controlled fabrication of multilayered structures known as 'Layered Synthetic Microstructures', to be used as mirrors for the extreme ultraviolet and soft x-ray regions. These can be produced with virtually any layer spacing greater than approximately 10 angstroms and they have a considerably high diffraction efficiency at normal or near-normal incidence. This remarkable enhancement in normal-incidence reflectivities at x-uv domain of the electromagnetic spectrum leads to another innovative application of these microstructures, i.e. the production of x-ray lasers with high gain-length products, where the enhanced normal-incidence reflectivity of the multilayers has been applied for multiple pass gain of the laser media by increasing the effective path lengths of the plasma columns. The present article covers the theoretical considerations, development and different techniques of controlled fabrication of layered synthetic microstructures along with their potential applications in the fields of x-ray spectroscopy, microscopy, x-ray laser production and lithography.

APA, Harvard, Vancouver, ISO, and other styles

31

CUI, S. F., Z. H. MAI, C. Y. WANG, L. S. WU, J. T. OUYANG, and J. H. LI. "X-RAY ANALYSIS OF Si1−xGex/Si SUPERLATTICES." Modern Physics Letters B 05, no. 23 (October 10, 1991): 1591–97. http://dx.doi.org/10.1142/s0217984991001891.

Full text

Abstract:

We present the studies on the correlation between the structural parameters of the well and the barrier in Si 1−x Ge x/ Si quantum well superlattices by using X-ray grazing incidence diffraction (GID) under total external reflection conditions and the conventional X-ray double-crystal diffraction. Both the coherent growth and the partial relaxed growth in the interfaces between the two components of the superlattices were found by the GID technique. The GID technique gave the valuable information that the relaxation occurs in the interfaces between the two components of the superlattices which cannot be distinguished by other analytical tools. This shows the potential of the depth-controlled analysis for superlattices by the GID technique.

APA, Harvard, Vancouver, ISO, and other styles

32

Hsu, Rebekah Min-Fang, Kai-Jan Lin, Cheng Tien, and Lin-Yan Jang. "X-Ray Absorption Fine Structure Study in FeTiO3." Modern Physics Letters B 11, no. 16n17 (July 20, 1997): 745–48. http://dx.doi.org/10.1142/s0217984997000918.

Full text

Abstract:

X-ray absorption fine structure XAFS spectroscopy has been used to determine the valence system for the Fe atom in ilmenite, FeTiO3 . This is the first XAFS data in FeTiO3 to our knowledge. The α- Fe2O3 data served as the standard in determining the ionization of the Fe atom in FeTiO3 . Observation of intensity and k-space are consistent. There was no evidence of mixed valence on comparing the FeTiO3 near edge X-ray absorption spectrum with α- Fe2O3 data. The absorption spectra suggest that iron is in the trivalent state in ilmenite.

APA, Harvard, Vancouver, ISO, and other styles

33

JIANG, S. S., and Y. QIU. "THE SIMULATION OF MODULATED PENDELLÖSUNG FRINGES OF PERFECT CRYSTALS FOR SPHERICAL X-RAY WAVE." Modern Physics Letters B 03, no. 04 (March 20, 1989): 319–23. http://dx.doi.org/10.1142/s0217984989000510.

Full text

Abstract:

The modulation in Pendellösung fringe visibility in perfect crystal is due to the interference between σ and π polarization states of X-ray wave. It is simulated by superposition of two polarization states by computer based on spherical X-ray wave dynamical theory and compared with fringe pattern on X-ray diffraction section topograph. It is found that the agreement between experimental result and theoretical calculation is satisfactory.

APA, Harvard, Vancouver, ISO, and other styles

34

Seres, J., E. Seres, C. Serrat, T. H. Dinh, N. Hasegawa, M. Ishino, M. Nishikino, K. Nakano, and S. Namba. "Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation." Journal of the Optical Society of America B 39, no. 4 (March 30, 2022): 1263. http://dx.doi.org/10.1364/josab.454902.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

ZAKAULLAH, M., IJAZ AKHTAR, S. F. MEHMOOD, A. WAHEED, and G. MURTAZA. "A COST EFFECTIVE X-RAY DETECTOR FOR PLASMA FOCUS DIAGNOSTICS." Modern Physics Letters B 14, no. 15 (June 30, 2000): 563–70. http://dx.doi.org/10.1142/s0217984900000732.

Full text

Abstract:

A time-resolved rugged X-ray detector (XRD) which may be used in intense radiation environment is developed. The detector is used to study the X-ray emission from a low-energy (2.3 kJ) Mather-type plasma focus energized by a 32 μF single capacitor, using hydrogen and argon (3:2) mixture as gas filling. In the detector, the electron emitter is made of nickel and aluminum. The sensitivity of the detector with nickel cathode is found to be very low. No signal could be recorded by masking the detector with even the 2 μm thick Al foil. When Al cathode is used in the XRD, the sensitivity of the detector increases abruptly. To stop the optical/ultraviolet radiation from approaching the active area, it is masked with 6 μm Al filter. It is found that an XRD with nickel cathode is not useful for X-ray detection in a low-energy plasma focus. However, due to its excellent response to vacuum ultraviolet radiation (≤600 Å), it may find application in the study of the axial rundown of current sheath, and its velocity. The X-ray emission from focus plasma is the highest at 0.5 mbar. With increase in pressure, the emission is dropped. At filling pressures of 2.0–2.5 mbar, the X-ray emission increases again. High X-ray emission at 0.5 mbar is due to interaction of energetic electrons in the current sheath with the anode surface, whereas moderately high emission at 2.0–2.5 mbar is caused by an axially moving shockwave.

APA, Harvard, Vancouver, ISO, and other styles

36

Johnson, Allan S., Timur Avni, Esben W. Larsen, Dane R. Austin, and Jon P. Marangos. "Attosecond soft X-ray high harmonic generation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (April 2019): 20170468. http://dx.doi.org/10.1098/rsta.2017.0468.

Full text

Abstract:

High harmonic generation (HHG) of an intense laser pulse is a highly nonlinear optical phenomenon that provides the only proven source of tabletop attosecond pulses, and it is the key technology in attosecond science. Recent developments in high-intensity infrared lasers have extended HHG beyond its traditional domain of the XUV spectral range (10–150 eV) into the soft X-ray regime (150 eV to 3 keV), allowing the compactness, stability and sub-femtosecond duration of HHG to be combined with the atomic site specificity and electronic/structural sensitivity of X-ray spectroscopy. HHG in the soft X-ray spectral region has significant differences from HHG in the XUV, which necessitate new approaches to generating and characterizing attosecond pulses. Here, we examine the challenges and opportunities of soft X-ray HHG, and we use simulations to examine the optimal generating conditions for the development of high-flux, attosecond-duration pulses in the soft X-ray spectral range. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

APA, Harvard, Vancouver, ISO, and other styles

37

Li, Wei, Ning-Juan Ruan, Xun Liu, and Feng Yan. "Error analysis of initial phase estimation for X-ray pulsar navigation system." Modern Physics Letters B 35, no. 17 (March 26, 2021): 2150287. http://dx.doi.org/10.1142/s0217984921502870.

Full text

Abstract:

In this paper, a nonlinear least squares estimator based on the extending cost function is derived, and its performance is analyzed in a Monte-Carlo simulation. Numerical results show that estimation error of the pulse time of arrival satisfies the normal distribution, the relation between the variance and the number of X-ray photon obtained by our simulation is compared with the analytical model. In addition, the effect of time bin size on the statically behavior of estimation error is also studied. This work holds great promise for designing the parameters of X-ray camera adopted in the pulsar navigation system.

APA, Harvard, Vancouver, ISO, and other styles

38

Liu, Shengjun, and Gundolf Schenk. "Data filtering method for correlated X-ray scattering (CXS)." Modern Physics Letters B 34, no. 02 (December 3, 2019): 2050018. http://dx.doi.org/10.1142/s0217984920500189.

Full text

Abstract:

Correlated X-ray scattering (CXS) which was explored to study the conformations of biological macromolecules in solution was studied further in this paper. In our experiment, three kinds of solution sample such as the Peg solution, the linear DNA from salmon sperm and the plasmid DNA were scattered by X-ray Free Electron Laser in Spring8 in Japan. And the X-ray scattering patterns with low rate of signal and noise were obtained. In order to improve the correlated signal, a cluster data filtering method for billions of scattering patterns was put forward. Finally, some of the scattering patterns with high artifacts which were related with potential sources of experimental set-up had been characterized and removed. In addition, different clusters were clarified so as to compute and analyze the angular autocorrelation of different clusters more effectively.

APA, Harvard, Vancouver, ISO, and other styles

39

Shen, Huimin, Yening Wang, Hengnan Zhou, Huaqing Wang, Zhongmin Niu, Zhifang Zhang, Huaixian Lu, Xuyu Zhang, and Jie Wu. "STUDY OF ANOMALIES ABOVE 90K IN POLYCRYSTALLINE YBa2Cu3O9−x BY X-RAY DIFFRACTION." International Journal of Modern Physics B 01, no. 02 (June 1987): 367–70. http://dx.doi.org/10.1142/s0217979287000499.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Wang, Xing, Zhongfeng Xu, and Limin Zhang. "Study of the angular distribution of W-L X-ray intensity ratios in photoionization." Modern Physics Letters B 30, no. 06 (March 7, 2016): 1650060. http://dx.doi.org/10.1142/s0217984916500603.

Full text

Abstract:

The angular distribution of W-[Formula: see text], [Formula: see text] and [Formula: see text] X-rays induced by 13.1 keV bremsstrahlung has been measured at different emission angles from 110[Formula: see text] to 140[Formula: see text] at intervals of 10[Formula: see text]. The investigation of angular dependence of [Formula: see text] X-ray intensity ratios by bremsstrahlung is barely found in previous works. The [Formula: see text] X-ray yield shows isotropic emission, while the measured [Formula: see text] and [Formula: see text] X-ray yields are found to be spatially anisotropic. At last, the anisotropy parameters for [Formula: see text] and [Formula: see text] X-rays have been derived.

APA, Harvard, Vancouver, ISO, and other styles

41

Zeng, Lingmin, Yeqing Chen, Wei He, and Liangqin Nong. "Nonlinear thermal expansion in Li2NiMn3O8." Powder Diffraction 23, no. 3 (September 2008): 224–27. http://dx.doi.org/10.1154/1.2959851.

Full text

Abstract:

A lattice thermal expansion study on Li2NiMn3O8, a high-voltage cathode material for lithium-ion batteries, was carried out by high-temperature X-ray diffraction from room temperature to 973 K. Rietveld refinement of a high-quality room-temperature diffraction pattern confirmed that Li2NiMn3O8 has the cubic Al2MgO4 spinel type of crystal structure. The analysis of the high-temperature X-ray diffraction patterns showed that the Li2NiMn3O8 structure remained stable and no phase transition was detected over the temperature range from 298 to 973 K. As expected, the value of lattice parameter a or unit cell volume V increases with increasing temperature. The increase in a or V is linear only in the low-temperature region and nonlinear over the entire temperature range from 298 to 973 K. Least-squares analysis of the data for a or V showed the thermal expansion of a or V for Li2NiMn3O8 can best be fitted by a 3-degree polynomial function of temperature. The linear thermal expansion coefficients for a and V averaged over the entire temperature range from 298 to 973 K were also calculated, and αTa=1.10×10−5 K−1; αTV=3.29×10−5 K−1.

APA, Harvard, Vancouver, ISO, and other styles

42

Zhang, Tong, Shengjie Zhao, Xu Ma, Angela P. Cuadros, Qile Zhao, and Gonzalo R. Arce. "Nonlinear reconstruction of coded spectral X-ray CT based on material decomposition." Optics Express 29, no. 13 (June 7, 2021): 19319. http://dx.doi.org/10.1364/oe.426732.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

SIEGRIST, T., and P. MARSH. "THERMAL VIBRATIONS IN Ba2YCu3O7 STUDIED BY X-RAY DIFFRACTION." Modern Physics Letters B 03, no. 03 (March 10, 1989): 195–99. http://dx.doi.org/10.1142/s0217984989000339.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

RAO, K. V. R., R. K. SINGHAL, D. C. JAIN, U. CHANDRA, H. S. CHAUHAN, N. L. SAINI, K. B. GARG, C. V. NARAS IHMA RAO, S. K. AGARWAL, and A. V. NARLIKAR. "X-RAY ABSORPTION STUDY OF YBa2(Cu1−xZnx)3O7." Modern Physics Letters B 03, no. 15 (October 1989): 1157–61. http://dx.doi.org/10.1142/s0217984989001771.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

CAMPOS, H. S., and W. A. KELLER. "SELF-CONSISTENT X-RAY DIFFRACTION PATTERNS OF PERFECT CRYSTAL." Modern Physics Letters B 03, no. 16 (November 10, 1989): 1221–24. http://dx.doi.org/10.1142/s0217984989001862.

Full text

Abstract:

We have developed a self-consistent X-ray scattering model for perfect crystal, which leads to obtain diffraction patterns similar to experimental findings. As an application of the model we carried out the calculations for the Si[333] reflection curve.

APA, Harvard, Vancouver, ISO, and other styles

46

Tay, B. K., X. Shi, S. P. Lau, Q. Zhang, H. C. Chua, J. R. Shi, E. C. Lim, and H. Y. Lee. "X-RAY REFLECTIVITY STUDY OF TETRAHEDRAL AMORPHOUS CARBON FILMS." International Journal of Modern Physics B 14, no. 02n03 (January 30, 2000): 181–87. http://dx.doi.org/10.1142/s0217979200000170.

Full text

Abstract:

Hydrogen-free amorphous carbon films were deposited at different deposition bais voltage on a single silicon wafer by a process known as Filtered Cathodic Vacuum Arc (FCVA). The influences of different deposition bias voltages on the microstructure and the properties of thin tetrahedral amorphous carbon (ta-C) films, such as surface roughness, film mass density and thickness, have been studied by means of the x-ray reflectivity technique (XRR) for the first time. The microstructure of these films deposited on silicon wafers was stimulated by a four-layer model consisting of a ta-C layer, a mixed ta-C:Si layer, Si-O layer and the silicon subtrate. The mixed ta-C:Si layer consisting of the mixture of ta-C and silicon simulates the carbon ion impinging / diffusion into the surface of the silicon substrate. The mass density and the roughness of the film are found to be dependent on the impinging ion bombardment energy. The mass density increases with increase in ion bombardment energy up to 100 eV. Beyond 100 eV, the mass density decreases with further increase in ion bombardment energy up to 100 eV. Beyond 100 EV, the mass density decreases with further increase in ion bombardment energy. The surface roughness decreases with increasing ion bambardment energy to a minimum value at 100 eV, after which it increases with further increase in ion bombardment energy. The thickness of the films obtained by XRR technique correlates well with the thickness measurement obtained by spectral reflectometry. The existence of the Si-O layer was verified by Auger depth profiling.

APA, Harvard, Vancouver, ISO, and other styles

47

BOWEN, MARSHALL A., and JOHN D. DOW. "X-RAY SPECTRA OF ORDERED AND DISORDERED BINARY COMPOUNDS." International Journal of Modern Physics B 02, no. 06 (December 1988): 1483–93. http://dx.doi.org/10.1142/s0217979288001311.

Full text

Abstract:

The X-ray photoemission, absorption, and emission spectra of a one-dimensional, one-orbital-per-site model of an ordered binary compound AB and its disordered counterparts A 1−x B 1−x B x A x are calculated. With increasing x, the band gap of this model changes from being large (insulating) to very small (semiconductive). Final-state interaction effects that produce electronic excitation of valence electrons across the gap are incorporated in a change-of-mean-field approximation. The spectra exhibit sidebands associated with disorder and distinctive features associated with the character of the one-electron states and excitonic states.

APA, Harvard, Vancouver, ISO, and other styles

48

KOTANI, A. "CORE-HOLE EFFECT IN THE Ce L3 X-RAY ABSORPTION SPECTRA OF CeO2 AND CeFe2: NEW EXAMINATION BY USING RESONANT X-RAY EMISSION SPECTROSCOPY." Modern Physics Letters B 27, no. 16 (June 6, 2013): 1330012. http://dx.doi.org/10.1142/s0217984913300123.

Full text

Abstract:

We consider two different resonant X-ray emission spectra for Ce compounds: Ce 3d to 2p X-ray emission (denoted by 3d-RXES) and valence to 2p X-ray emission (v-RXES), both of which follow the Ce 2p to 5d resonant excitation. We propose that the comparison of the 3d- and v-RXES spectra is a new powerful method of directly detecting the core-hole effect in the final state of Ce L 3 X-ray absorption spectra (XAS). We applied this method to recent experimental RXES spectra for CeO 2 and CeFe 2, and showed unambiguously that the core-hole effect should be essential in the XAS of both materials. This result is confirmed by theoretical calculations, which reproduce well the experimental RXES and XAS spectra. We conclude that the ground state of CeO 2 is in the mixed state of 4f0 and [Formula: see text] configurations, where [Formula: see text] is a ligand hole, instead of a pure 4f0 configuration which was proposed recently by first-principles energy band calculations. Also, we conclude that the double peaks observed in L 3 XAS of CeFe 2 are caused by the 4f0 and 4f1 configurations, which are mixed in the ground state but separated in energy by the large core-hole potential in the final state of XAS.

APA, Harvard, Vancouver, ISO, and other styles

49

Först, M., R. Mankowsky, H. Bromberger, D. M. Fritz, H. Lemke, D. Zhu, M. Chollet, et al. "Displacive lattice excitation through nonlinear phononics viewed by femtosecond X-ray diffraction." Solid State Communications 169 (September 2013): 24–27. http://dx.doi.org/10.1016/j.ssc.2013.06.024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Vinogradov, Aleksandr V. "Multilayer X-ray optics." Quantum Electronics 32, no. 12 (December 31, 2002): 1113–21. http://dx.doi.org/10.1070/qe2002v032n12abeh002354.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!