Study of energy dependent behaviour of half-lens polycapillary optics using synchrotron x-rays

2020 ◽  
Author(s):  
Ayushi Trivedi ◽  
Ajay Khooha ◽  
P. Mondal ◽  
S. R. Kane ◽  
M. K. Tiwari
Keyword(s):  
X Rays ◽  
Polycapillary Optics ◽  
Energy Dependent ◽  
Dependent Behaviour

The Electron Injection Function and Energy‐dependent Delays in Thick‐Target Hard X‐Rays

1998 ◽  
Vol 509 (2) ◽  
pp. 911-917 ◽  
Author(s):  
John C. Brown ◽  
Andrew J. Conway ◽  
Markus J. Aschwanden
Keyword(s):  
Electron Injection ◽  
Thick Target ◽  
X Rays ◽  
Energy Dependent ◽  
Injection Function

scholarly journals Magnetic X-Ray Circular Dichroism in Spin-Polarized Photoelectron Diffraction

1994 ◽  
Vol 375 ◽  
Author(s):  
G. D. Waddill ◽  
J. G. Tobin ◽  
X. Guo ◽  
S. Y. Tong
Keyword(s):  
Magnetic Structure ◽  
Multiple Scattering ◽  
Analytical Procedure ◽  
Structural Determination ◽  
X Rays ◽  
Circularly Polarized ◽  
X Ray ◽  
Photoelectron Diffraction ◽  
Spin Polarized ◽  
Energy Dependent

AbstractThe first structural determination with spin-polarized, energy-dependent photoelectron diffraction using circularly-polarized x-rays is reported for Fe films on Cu(001). Circularly-polarized x-rays produce spin-polarized photoelectrons from the Fe 2p doublet, and intensity asymmetries in the 2p3/2 level are observed. Fully spin-specific multiple scattering calculations reproduce the experimentally-determined energy and angular dependences. A new analytical procedure which focuses upon intensity variations due to spin-dependent diffraction is introduced. A sensitivity to local geometric and magnetic structure is demonstrated.

Overview of polycapillary X-ray optics

2002 ◽  
Vol 17 (2) ◽  
pp. 70-80 ◽  
Author(s):  
Paul J. Schields ◽  
David M. Gibson ◽  
Walter M. Gibson ◽  
Ning Gao ◽  
Huapeng Huang ◽  
...  
Keyword(s):  
Focal Spot ◽  
State Of The Art ◽  
Substantial Reduction ◽  
Spot Size ◽  
Source Size ◽  
Total External Reflection ◽  
X Rays ◽  
Focal Spot Size ◽  
Polycapillary Optics ◽  
X Ray

Polycapillary optics are utilized in a wide variety of applications and are integral components in many state of the art instruments. Polycapillary optics operate by collecting X-rays and efficiently propagating them by total external reflection to form focused and parallel beams. We discuss the general parameters for designing these optics and provide specific examples on balancing the interrelations of beam flux, source size, focal spot-size, and beam divergence. The development of compact X-ray sources with characteristics tailored to match the requirements of polycapillary optics allows substantial reduction in size, weight, and power of complete X-ray systems. These compact systems have enabled the development of portable, remote, and in-line sensors for applications in industry, science and medicine. We present examples of the utility and potential of these optics for enhancing a wide variety of X-ray analyses.

scholarly journals The Hϒ Line Spectrum of Intermediate Polars

1998 ◽  
Vol 11 (1) ◽  
pp. 385-385
Author(s):  
Y. Kim ◽  
K. Beuermann
Keyword(s):  
Spectral Range ◽  
Line Spectrum ◽  
Model Parameters ◽  
X Rays ◽  
X Ray ◽  
Rotational Modulation ◽  
Intermediate Polars ◽  
Dominant Process ◽  
Energy Dependent ◽  
Insight Into

By using of a model for the propagation of the emitted X-rays through the infalling material and the reemission of the energy deposited by photoabsorption in the optical (and UV) spectral range (Kim & Beuermann, 1995) we calculated Hϒ line spectrum of intermediate polars. Photoabsorption of X-rays by the infalling material is the dominant process in forming the observed energy-dependent rotational modulation of the X-ray flux. X-ray and optical modulations are sensitive to model parameters in different ways. In principle these dependences allow us to obtain improved insight into the geometry of intermediate polars. Some results of our calculation will be presented in this paper in comparison with the Hβ spectrum calculated by Kim & Beuermann (1996).

High-performance monochromator of parallel x-rays on the basis of Kumakhov polycapillary optics

2005 ◽  
Author(s):  
E. V. Likhoushina ◽  
M. A. Kumakhov ◽  
N. S. Ibraimov ◽  
S. V. Nikitina ◽  
A. A. Bolotokov ◽  
...  
Keyword(s):  
High Performance ◽  
X Rays ◽  
Polycapillary Optics

Modelling Photoelectron Effects In X-Ray Lithography

1993 ◽  
Vol 306 ◽  
Author(s):  
L. E. Ocola ◽  
F. Cerrina
Keyword(s):  
Monte Carlo ◽  
Spatial Distribution ◽  
Kinetic Energy ◽  
Monte Carlo Simulations ◽  
Energy Range ◽  
X Rays ◽  
X Ray ◽  
Atomic Species ◽  
Energy Dependent ◽  
X Ray Absorption

AbstractThe study of photoelectron effects in X-ray Lithography motivates the need for modeling codes to simulate these effects to have an estimate of the influence of x-ray generated photoelectrons in the exposure of resists. We have performed a series of Monte Carlo simulations to study the spatial distribution of photoelectrons in a resist, PMMA, and parametrized this distribution with a set of energy-dependent gaussians for monochromatic X-rays within an energy range of 0.5 KeV to 2.5 KeV. We discuss the effects of the the redistribution of the photoelectron kinetic energy as a function of the electrons generated by the x-ray absorption in various atomic species.

scholarly journals Energy-dependent orbital modulation of X-rays and constraints on emission of the jet in Cyg X-3

2012 ◽  
Vol 426 (2) ◽  
pp. 1031-1042 ◽  
Author(s):  
Andrzej A. Zdziarski ◽  
Chandreyee Maitra ◽  
Adam Frankowski ◽  
Gerald K. Skinner ◽  
Ranjeev Misra
Keyword(s):  
X Rays ◽  
Orbital Modulation ◽  
Energy Dependent

Site-specific electronic structures of ferrimagnetic Fe3O4 measured by resonant X-ray magnetic scattering

2014 ◽  
Vol 47 (4) ◽  
pp. 1387-1394 ◽  
Author(s):  
Maki Okube ◽  
Satoshi Sasaki
Keyword(s):  
Electronic Structures ◽  
Magnetic Moments ◽  
Energy Levels ◽  
Magnetic Scattering ◽  
Local Spin Density Approximation ◽  
X Rays ◽  
Fourier Synthesis ◽  
Site Specific ◽  
X Ray ◽  
Energy Dependent

Resonant magnetic scattering of circularly polarized synchrotron X-rays has revealed the site-specific magnetic moments at two non-equivalent Fe ion sites in Fe3O4. The energy-dependent peaks for the 026 and 266 reflections were attributed ferrimagnetically to the e and t 2 energy levels of Fe 3d at the A site, and to the t 2g and e g levels at the B site, respectively, having a sequence of t 2g, e, e g and t 2 in order of energy. This sequence agrees with the local spin-density approximation calculations in the literature [Anisimov, Elfimov, Hamada & Terakura, (1996). Phys. Rev. 54, 4387–4390], in which the spin-down band at the Fermi energy corresponds to t 2g . Resonant magnetic Fourier synthesis reveals the electron densities of the ferrimagnetic moments.

Magnetic dichroism inL2,3emission of Fe, Co, and Ni following energy-dependent excitation with circularly polarized x rays

1994 ◽  
Vol 50 (22) ◽  
pp. 16758-16761 ◽  
Author(s):  
L.-C. Duda ◽  
J. Stöhr ◽  
D. C. Mancini ◽  
A. Nilsson ◽  
N. Wassdahl ◽  
...  
Keyword(s):  
X Rays ◽  
Circularly Polarized ◽  
Magnetic Dichroism ◽  
Energy Dependent
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