scholarly journals Soft X-ray absorption spectroscopy in the low-energy region explored using an argon gas window

2020 ◽  
Vol 27 (4) ◽  
pp. 959-962
Author(s):  
Masanari Nagasaka
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Region ◽  
Low Energy ◽  
X Rays ◽  
Argon Gas ◽  
X Ray ◽  
First Order ◽  
Helium Gas ◽  
Transmission Window ◽  
X Ray Absorption

The soft X-ray region below 200 eV is important for investigating chemical and biological phenomena since it covers K-edges of Li and B and L-edges of Si, P, S and Cl. Helium gas is generally used as the soft X-ray transmission window for soft X-ray absorption spectroscopy (XAS) under atmospheric conditions. However, the helium gas window cannot be applied to XAS in the low-energy region since transmitted soft X-rays mostly consist of high-order X-rays due to the low transmission of first-order X-rays. In this study, the argon gas window is proposed as a new soft X-ray transmission window in the low-energy region. High-order X-rays are removed by the absorption of the Ar L-edge (240 eV), and first-order X-rays become the major contribution of transmitted soft X-rays in the low-energy region. Under atmospheric argon conditions, the double-excitation Rydberg series of helium gas (60 eV), Si L-edge XAS of an Si3N4 membrane (100 eV) and S L-edge XAS of dimethyl sulfoxide gas (170 eV) are successfully measured, indicating that the argon gas window is effective for soft X-ray transmission in the low-energy region from 60 eV to 240 eV.

${\rm{MeV}}\mbox{-}\left( {\rm{C}} \right)_{\rm{2}}^{\rm{ + }} $-ION-INDUCED Cu K X-RAY EMISSION

1995 ◽  
Vol 05 (01) ◽  
pp. 21-25
Author(s):  
Xia Zonghuang ◽  
Wang Qian ◽  
Shen Dingyu ◽  
Li Shuozhong
Keyword(s):  
Energy Region ◽  
Ion Beams ◽  
Low Energy ◽  
Broad Peak ◽  
X Rays ◽  
Experimental Uncertainty ◽  
X Ray ◽  
Copper Target ◽  
Ionization Effect

Cu K X-ray spectra for a copper target bombarded with ion beams of 1.4 [Formula: see text] ions, 2. 8 [Formula: see text] ions, and 3.0 MeV-Si+ ions have been measured with a Si(Li) detector. It is found that the Cu K X-ray spectrum for [Formula: see text] ion bombardments is almost same as that for C+ ion bombardments, whereas the spectrum for Si+ ion bombardments has a broad peak of MO X-rays in the low-energy region. The values of Kα/Kα+β for the Cu K X-rays are very close each other within the experimental uncertainty in these three cases. Thus, no multi-ionization effect is observed in the K X-ray emission by [Formula: see text] beam bombardments.

Time-resolved soft x-ray absorption spectroscopy of silicon using femtosecond laser plasma x rays

1999 ◽  
Vol 75 (16) ◽  
pp. 2350-2352 ◽  
Author(s):  
Hidetoshi Nakano ◽  
Yoshinori Goto ◽  
Peixiang Lu ◽  
Tadashi Nishikawa ◽  
Naoshi Uesugi
Keyword(s):  
Femtosecond Laser ◽  
Absorption Spectroscopy ◽  
Laser Plasma ◽  
X Rays ◽  
Time Resolved ◽  
X Ray ◽  
Femtosecond Laser Plasma ◽  
X Ray Absorption

Detecting sp2-bonded carbon in diamond using optically detected X-ray absorption spectroscopy

2011 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
G. O. Jones ◽  
O. R. Roberts ◽  
G. T. Williams ◽  
D. P. Langstaff ◽  
N. R. J. Poolton ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Transmitted Light ◽  
X Rays ◽  
Lateral Variation ◽  
X Ray ◽  
Local Bonding ◽  
Optical Luminescence ◽  
Optically Detected ◽  
X Ray Absorption ◽  
Absorption Contrast

Optically detected X-ray absorption spectroscopy (ODXAS) and X-ray excited optical luminescence (XEOL) have been applied in parallel to the study of local bonding in luminescent diamonds. Imaging ODXAS and XEOL reveal correlations between lateral variation in colour (transmitted light and luminescence) and local carbon bonding in selected samples showing strong optical absorption contrast. Dark regions of the crystals viewed in transmitted light correlate with a lower total luminescence yield when excited with soft X-rays of photon energy ~280 eV. ODXAS reveals a higher proportion of sp2-bonded carbon species in darker (less luminescent) regions associated with graphitic micro-inclusions.

DYNAMIC OBSERVATION OF LASER-ABLATED CARBON PARTICLES USING TIME-RESOLVED X-RAY ABSORPTION SPECTROSCOPY

1996 ◽  
Vol 03 (01) ◽  
pp. 191-195 ◽  
Author(s):  
A. MIYASHITA ◽  
T. OHYANAGI ◽  
O. YODA ◽  
K. MURAKAMI
Keyword(s):  
Absorption Spectroscopy ◽  
Ablation Plume ◽  
Time Resolved ◽  
X Ray ◽  
Carbon Particles ◽  
Dynamic Observation ◽  
Helium Gas ◽  
Gas Environment ◽  
Small Clusters ◽  
X Ray Absorption

Time- and space-resolved characteristics of laser-ablated carbon particles were studied by x-ray absorption spectroscopy. Absorption peaks from the 1s→2p transition of neutral carbon atom ( C 0), C −, C +, and C 2+ ions were observed, An absorption peak from 1s→π* and a broad absorption maximum from the 1s→σ* transition of small clusters were also observed. Neutral carbon, C −, C +, and small carbon clusters were emitted from the sample long after laser irradiation. Spatial distributions of laser-ablated carbon particles in the localized helium-gas environment were measured. In the helium-gas environment, the ablation plume was depressed by the helium cloud generated on the top of the ablation plume.

scholarly journals Oxygen binding by Helix pomatia α-haemocyanin studied by X-ray-absorption spectroscopy

1983 ◽  
Vol 209 (2) ◽  
pp. 373-377 ◽  
Author(s):  
R Torensma ◽  
J C Phillips
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Helix Pomatia ◽  
Oxygen Binding ◽  
X Rays ◽  
X Ray ◽  
X Ray Absorption

The X-ray absorption spectra of haemocyanin from Helix pomatia were obtained by using X-rays from synchrotron radiation. Cu K-edges were recorded at four conditions, namely fully oxygenated, 85% oxygenated, 12% oxygenated and fully deoxygenated. The percentage oxygenation calculated from the edge-shift of the partially oxygenated samples did not agree with the percentage oxygenation as determined by u.v. measurements. Two intermediates in the oxygenation process are presented to explain the observed dissimilarities.

Distribution and speciation of bromine in mammalian tissue and fluids by X-ray fluorescence imaging and X-ray absorption spectroscopy

Metallomics ◽  
2015 ◽  
Vol 7 (5) ◽  
pp. 756-765 ◽  
Author(s):  
Melanie J. Ceko ◽  
Katja Hummitzsch ◽  
Nicholas Hatzirodos ◽  
Wendy Bonner ◽  
Simon A. James ◽  
...  
Keyword(s):  
Fluorescence Imaging ◽  
Absorption Spectroscopy ◽  
X Rays ◽  
Mammalian Tissue ◽  
X Ray ◽  
Mammalian Tissues ◽  
X Ray Absorption

The first study of bromine speciation and distribution in mammalian tissues using X-rays shows bromine present predominantly as bromide.

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