Spectral change in X-ray absorption near edge structure of DNA thin films irradiated with monochromatic soft X-rays

AbstractX-rays at grazing incidence have a short, controllable penetration depth and are well suited as a probe of surface and interface structures. This paper examines the possibility applying grazing-incidence reflectivity and Extended X-Ray Absorption Fine Structure (EXAFS) measurements to such systems. Results are presented for an Al-Cu couple for which both high resolution reflectivity and interface EXAFS measurements are made. The latter results are the first interface specific EXAFS data to be reported. Distinct changes in both signals are observed upon annealing, demonstrating the potential of the techniques.

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Soft X-ray excited colour-centre luminescence and XANES studies of calcium oxide

Canadian Journal of Chemistry ◽

10.1139/v07-109 ◽

2007 ◽

Vol 85 (10) ◽

pp. 853-858 ◽

Cited By ~ 4

Author(s):

JY Peter Ko ◽

Franziskus Heigl ◽

Yun Mui Yiu ◽

Xing-Tai Zhou ◽

Tom Regier ◽

...

Keyword(s):

Calcium Oxide ◽

Density Functional ◽

X Rays ◽

Colour Centre ◽

Time Resolved ◽

Edge Structure ◽

Colour Centres ◽

X Ray ◽

Optical Luminescence ◽

X Ray Absorption

In this study, we show that colour centres can be produced by irradiating calcium oxide with soft X-rays from a synchrotron radiation source. Using the X-ray excited optical luminescence (XEOL) technique, two colour centres, F-centre, and F+-centre can be identified. These colour centres emit photons at characteristic wavelengths. In addition, by performing time-resolved XEOL (TRXEOL), we are able to reveal timing and decay characteristics of the colour centres. We also present X-ray absorption near-edge structure (XANES) spectra collected across oxygen K-edge, calcium L3,2-edge, and calcium K-edge. Experimental results are compared with density functional theory (DFT) calculations.Key words: calcium oxide, colour centre, synchrotron, X-ray excited optical luminescence, X-ray absorption near-edge structure.

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Photoluminescence and X-ray absorption near edge structure of Eu ions doped SiO2 thin films

Materials Science and Engineering B ◽

10.1016/s0921-5107(00)00732-7 ◽

2001 ◽

Vol 81 (1-3) ◽

pp. 179-181 ◽

Cited By ~ 3

Author(s):

F. Liu ◽

M. Zhu ◽

T. Liu

Keyword(s):

Thin Films ◽

Edge Structure ◽

X Ray ◽

X Ray Absorption

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Variation of electronic structures of CeAl2 thin films with thickness studied by X-ray absorption near-edge structure spectroscopy

Journal of Electron Spectroscopy and Related Phenomena ◽

10.1016/j.elspec.2006.01.004 ◽

2006 ◽

Vol 152 (1-2) ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

C.L. Dong ◽

K. Asokan ◽

C.L. Chang ◽

C.L. Chen ◽

P.C. Lee ◽

...

Keyword(s):

Thin Films ◽

Electronic Structures ◽

Edge Structure ◽

X Ray ◽

X Ray Absorption

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Electronic structure and x-ray-absorption near-edge structure of amorphous Zr-oxide and Hf-oxide thin films: A first-principles study

Journal of Applied Physics ◽

10.1063/1.1884268 ◽

2005 ◽

Vol 97 (7) ◽

pp. 073519 ◽

Cited By ~ 5

Author(s):

SungKwan Kim ◽

Yangsoo Kim ◽

Jongin Hong ◽

Isao Tanaka ◽

Kwangsoo No

Keyword(s):

Thin Films ◽

Electronic Structure ◽

First Principles ◽

Oxide Thin Films ◽

Edge Structure ◽

X Ray ◽

First Principles Study ◽

X Ray Absorption

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Effect of thickness and Si substrate morphology in La0.7Sr0.3MnO3/Si thin films

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273314084678 ◽

2014 ◽

Vol 70 (a1) ◽

pp. C1532-C1532

Author(s):

Hsiao-Tsu Wang ◽

Mau- Kuen Wu ◽

Yu-Cheng Shao ◽

Yu-Fu Wang ◽

Shang-Hsien Hsieh ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Electronic Structures ◽

Magnetic Circular Dichroism ◽

Magnetic Behavior ◽

Si Substrate ◽

Edge Structure ◽

X Ray ◽

X Ray Absorption ◽

Different Thickness

Investigation has been made on atomic, electronic structures and magnetic properties of La0.7Sr0.3MnO3 (LSMO) on Si substrate. The effect of different thickness of LSMO and different morphological [flat and nano-pyramid (NP)] of Si substrate are studied in present work. The result of Mn K-edge extended x-ray absorption fine structure indicates the more disorder of local atomic structure of first shell (Mn-O bound) in the thinner LSMO/Si film. The Mn L3,2-edge x-ray absorption near-edge structure shows the presence of Mn2+ ion on the sample. Furthermore, the Mn L3,2-edge x-ray magnetic circular dichroism reveals that the thinner film (LSMO/Si) has highest magnetic moment, in comparison to that of thick LSMO/Si and LSMO/Si-NP samples. This finding suggests that the appearance Mn2+ may play an important role in magnetic behavior of hetero-junction LSMnO/Si and Si-NP.

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Implementation of cryogenic tender X-ray HR-XANES spectroscopy at the ACT station of the CAT-ACT beamline at the KIT Light Source

Journal of Synchrotron Radiation ◽

10.1107/s1600577521012650 ◽

2022 ◽

Vol 29 (1) ◽

Author(s):

Bianca Schacherl ◽

Tim Prüssmann ◽

Kathy Dardenne ◽

Kirsten Hardock ◽

Volker Krepper ◽

...

Keyword(s):

Light Source ◽

High Energy ◽

Xanes Spectroscopy ◽

Nuclear Waste Repository ◽

X Rays ◽

Edge Structure ◽

X Ray ◽

Analyzer Crystal ◽

Institute Of Technology ◽

X Ray Absorption

The ACT experimental station of the CAT-ACT wiggler beamline at the Karlsruhe Institute of Technology (KIT) Light Source is dedicated to the investigation of radionuclide materials with radioactivities up to 1000000 times the exemption limit by various speciation techniques applying monochromatic X-rays. In this article, the latest technological developments at the ACT station that enable high-resolution X-ray absorption near-edge structure (HR-XANES) spectroscopy for low radionuclide loading samples are highlighted – encompassing the investigation of actinide elements down to 1 p.p.m. concentration – combined with a cryogenic sample environment reducing beam-induced sample alterations. One important part of this development is a versatile gas tight plexiglass encasement ensuring that all beam paths in the five-analyzer-crystal Johann-type X-ray emission spectrometer run within He atmosphere. The setup enables the easy exchange between different experiments (conventional X-ray absorption fine structure, HR-XANES, high-energy or wide-angle X-ray scattering, tender to hard X-ray spectroscopy) and opens up the possibility for the investigation of environmental samples, such as specimens containing transuranium elements from contaminated land sites or samples from sorption and diffusion experiments to mimic the far field of a breached nuclear waste repository.

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