Chemical effects on L X-ray intensity ratios of U and Th

2002 ◽  
Vol 80 (8) ◽  
pp. 925-930 ◽  
Author(s):  
A Küçükönder
Keyword(s):  
High Resolution ◽  
Gamma Rays ◽  
Detector System ◽  
X Ray ◽  
Chemical Effects ◽  
Intensity Ratios ◽  
Experimental Values

The chemical effects on the Lβ/Lα, Ll /Lα, and Lγ/Lα X-ray intensity ratios of U and Th were investigated. Vacancies were produced by heavily filtered 241Am gamma rays. A high-resolution Si(Li) detector system was used in the experiments. The experimental values are given with the theoretical values of the pure U and Th elements. PACS Nos.: 32.30Rj

USE OF HIGH-RESOLUTION X-RAY SPECTROMETER FOR THE STUDY OF CHEMICAL EFFECTS IN X-RAY SPECTRA

1996 ◽  
Vol 06 (01n02) ◽  
pp. 51-57 ◽  
Author(s):  
M. BUDNAR ◽  
M. KAVČIČ ◽  
T. TADIĆ ◽  
I. BOGDANOVIĆ ◽  
M. JAKŠIĆ ◽  
...  
Keyword(s):  
High Resolution ◽  
Atomic Physics ◽  
X Ray ◽  
Chemical Effects ◽  
Intensity Ratios

In the contribution the high-resolution X-ray spectrometer, originally constructed for the atomic physics research, is presented. Test measurements of Lβ and Lγ intensity ratios on In and Te compounds were performed. The applicability of the spectrometer for detection of chemical effects in X-ray spectra of compounds is discussed.

Observing the Chemical State of Elements With Z=21 To 28 From L Alpha1 To L L Ratios With Energy Dispersive Spectroscopy (EDS)

1999 ◽  
Vol 5 (S2) ◽  
pp. 590-591
Author(s):  
A. Sandborg ◽  
R. Anderhalt
Keyword(s):  
High Resolution ◽  
Atomic Number ◽  
Energy Dispersive Spectroscopy ◽  
Emission Spectra ◽  
Outer Electron ◽  
Number Range ◽  
X Ray ◽  
Chemical Effects ◽  
Intensity Changes ◽  
Electron Shells

It is well known that chemical bonding affects elemental x-ray emission spectra. The spectra of low atomic number elements show energy shifts which depend on the bonding of the element. To observe these shifts, a high resolution wavelength dispersive (WDS) x-ray spectrometer is required. Intensity variations of the L series can be observed with an EDS system which also show chemical effects.The L Alphal and the L L radiations are produced from a vacancy in the L III shell. Normally the L L line is about 5 to 6% of the intensity of the L Alphal line. However, in the atomic number range of Z=21 to 28, it is easily observed that the L L line becomes more intense. The L Alphal is no longer present at Z=20. These intensity changes are due to the outer electron shells of these atoms being unfilled. The L Alphal comes from the L3-M5 transition, while the L L comes from L3-M1 transition. The M5 (3d level) of the M shell is partially filled for Z=21 to 28; empty for Z<21and full for Z> 28. Holliday observed a Ti LL which was 17% greater than the Ti L Alphal.

WE-C-L100J-04: The Solid State X-Ray Image Intensifier (SSXII): A Next-Generation High-Resolution Fluoroscopic Detector System

2007 ◽  
Vol 34 (6Part20) ◽  
pp. 2585-2585
Author(s):  
S Rudin ◽  
A Kuhls ◽  
C Keleshis ◽  
D Kim ◽  
G Yadava ◽  
...  
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Image Intensifier ◽  
Detector System ◽  
Next Generation ◽  
X Ray

Photon-Induced L-Shell X-Ray Production Cross Sections for Lanthanides at 59.54 keV

2017 ◽  
Vol 890 ◽  
pp. 223-226 ◽  
Author(s):  
Rıdvan Durak ◽  
Ferdi Akman ◽  
Abdulhalik Karabulut
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Production Cross ◽  
Theoretical Data ◽  
Experimental Results ◽  
X Rays ◽  
X Ray ◽  
Reflection Geometry ◽  
Experimental Values ◽  
Annular Source

The Ll, Lα and Lβ X-ray production cross sections for Pr, Nd, Sm, Eu, Gd and Tb elements were determined using a reflection geometry. The excitation was performed with a 241Am radioactive annular source and the L X-rays emitted from targets were counted with a high-resolution Si (Li) detector. The experimental values were compared with other available experimental results and theoretical data. An agreement is observed between the measured and other experimental results or theoretical data.

Chemical effects on Lα/Lβ X-ray intensity ratios of Ba, La and Ce

1998 ◽  
Vol 53 (1) ◽  
pp. 151-154 ◽  
Author(s):  
E. Baydaş ◽  
N. Ekinci ◽  
E. Büyükkasap ◽  
Y. Şahin
Keyword(s):  
X Ray ◽  
Chemical Effects ◽  
Intensity Ratios

scholarly journals High-Resolution X-Ray Spectroscopy of Galactic Supernova Remnants

2014 ◽  
Vol 1 (1) ◽  
pp. 200-204
Author(s):  
Satoru Katsuda ◽  
Hiroshi Tsunemi
Keyword(s):  
High Resolution ◽  
Supernova Remnants ◽  
Line Emission ◽  
Collisionless Shock ◽  
Reverse Shock ◽  
X Ray ◽  
Upper Limit ◽  
Hot Plasma ◽  
Forward Shock ◽  
Intensity Ratios

High-resolution X-ray spectroscopy of Galactic supernova remnants (SNRs), based on grating spectrometers onboard XMM-Newton and Chandra, has been revealing a variety of new astrophysical phenomena. Broadened oxygen lines for a northwestern compact knot in SN 1006 clearly show a high oxygen temperature of ~300 keV. The high temperature together with a lower electron temperature (<em>kT<sub>e</sub></em> ~ 1 keV) can be reasonably interpreted as temperature non-equilibration between electrons and oxygen behind a collisionless shock. An ejecta knot in the Puppis A SNR shows blueshifted line emission by ~ 1500kms<sup>-1</sup>. The line widths are fairly narrow in contrast to the SN 1006's knot; an upper limit of 0.9 eV is obtained for O VIII Lyα, which translates to an oxygen temperature of <em>kT<sub>O</sub></em> &lt; 30 keV. The low temperature suggests that the knot was heated by a reverse shock whose velocity is 4 times slower than that of a forward shock. Anomalous intensity ratios in O VII Heα lines, i.e., a stronger forbidden line than a resonance line, is found in a cloud-shock interaction region in Puppis A. The line ratio can be best explained by the charge-exchange emission that should arise at interfaces between the cold/warm clouds and the hot plasma. There are several other targets for which we plan to analyze high-quality grating data prior to the operation of the soft X-ray spectrometer onboard Astro-H.

High Resolution Spectroscopy of Dite Tokamak in the 10Å Region

1988 ◽  
Vol 102 ◽  
pp. 91-94
Author(s):  
J. Dunn ◽  
R. Barnsley ◽  
K.D. Evans ◽  
N.J. Peacock
Keyword(s):  
Fine Structure ◽  
High Resolution ◽  
Spectral Region ◽  
Intensity Ratio ◽  
High Resolution Spectroscopy ◽  
X Ray ◽  
Experimental Values

AbstractAn account is given of the X-Ray emission from the DITE tokamak in the spectral region 4Å–10Å measured by a Johann curved crystal photographic spectrometer. This high resolution instrument has been used for detailed line identifications eg. of L-shell transitions in the Fe spectrum at wavelengths ∼8Å and of the He-like ion spectra of Al, Si and Ar. The fine structure has been resolved for H-like Mg, Al and Si. Departures from the statistical value of 0.5 forβ, the intensity ratio of the Lyman-αdoublet, have been observed. Experimental values for the fine structure separation are presented for these medium Z metals.

Chemical State Analysis using a Gearless Two-Crystal X-Ray Spectrometer

1991 ◽  
Vol 35 (A) ◽  
pp. 393-399
Author(s):  
Tokuzo Konishi ◽  
Kazuo Nishihagi ◽  
Kazuo Taniguchi
Keyword(s):  
High Resolution ◽  
Systematic Study ◽  
Chemical State ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Analyzer Crystal ◽  
Chemical Effects ◽  
Scanning Range ◽  
State Analysis

A two-crystal spectrometer for chemical state analysis by high-resolution x-ray fluorescence spectrometry employs hall-screw and slide mechanisms rather than gears to obtain a 2θ scanning range of 40° -147°; a Δ2θ scanning step of 10−4 deg under vacuus; a 2θ resolution of 10−4 deg in determination of an intercrystal angle with encoder-based measurement; and servomechanical control of position. The spectrometer, although simple in structure, is a powerful instrument for chemical state analysis, as demonstrated by its high resolution, precision, and stability; as demonstrated in the determination of the Kα1 lines of first transition metals with Si(220) as analyzer crystal, and in its application to a systematic study of the chemical effects on Ni Kα1 and Kα2.

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