A novel intensity interferometer for synchrotron radiation in the vacuum ultraviolet and soft x-ray regions

2000 ◽  
Vol 71 (3) ◽  
pp. 1256-1263 ◽  
Author(s):  
RenZhong Tai ◽  
Yasuhiro Takayama ◽  
Noriko Takaya ◽  
Tsuneaki Miyahara ◽  
Shigeru Yamamoto ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
X Ray ◽  
Intensity Interferometer

A study of the response of Y3Al5O12:Ce phosphor powder screens in the vacuum ultraviolet and soft X-ray regions using synchrotron radiation

2000 ◽  
Vol 7 (4) ◽  
pp. 215-220 ◽  
Author(s):  
A. Baciero ◽  
K. J. McCarthy ◽  
M. A. Acedo ◽  
L. Rodriguez-Barquero ◽  
J.  Avila ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Phosphor Powder ◽  
X Ray

scholarly journals In situremoval of carbon contamination from a chromium-coated mirror: ideal optics to suppress higher-order harmonics in the carbonK-edge region

2015 ◽  
Vol 22 (6) ◽  
pp. 1359-1363 ◽  
Author(s):  
Akio Toyoshima ◽  
Takashi Kikuchi ◽  
Hirokazu Tanaka ◽  
Kazuhiko Mase ◽  
Kenta Amemiya
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Higher Order ◽  
Second Order ◽  
Edge Region ◽  
Carbon Contamination ◽  
X Ray ◽  
Photon Factory ◽  
First Order ◽  
Edge Absorption

Carbon-free chromium-coated optics are ideal in the carbonK-edge region (280–330 eV) because the reflectivity of first-order light is larger than that of gold-coated optics while the second-order harmonics (560–660 eV) are significantly suppressed by chromiumL-edge and oxygenK-edge absorption. Here, chromium-, gold- and nickel-coated mirrors have been adopted in the vacuum ultraviolet and soft X-ray branch beamline BL-13B at the Photon Factory in Tsukuba, Japan. Carbon contamination on the chromium-coated mirror was almost completely removed by exposure to oxygen at a pressure of 8 × 10−2 Pa for 1 h under irradiation of non-monochromated synchrotron radiation. The pressure in the chamber recovered to the order of 10−7 Pa within a few hours. The reflectivity of the chromium-coated mirror of the second-order harmonics in the carbonK-edge region (560–660 eV) was found to be a factor of 0.1–0.48 smaller than that of the gold-coated mirror.

In situremoval of carbon contamination from optics in a vacuum ultraviolet and soft X-ray undulator beamline using oxygen activated by zeroth-order synchrotron radiation

2012 ◽  
Vol 19 (5) ◽  
pp. 722-727 ◽  
Author(s):  
Akio Toyoshima ◽  
Takashi Kikuchi ◽  
Hirokazu Tanaka ◽  
Jun-ichi Adachi ◽  
Kazuhiko Mase ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Zeroth Order ◽  
Carbon Contamination ◽  
X Ray

scholarly journals Decay Kinetics of CeF3 under VUV and X-ray Synchrotron Radiation

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 914
Author(s):  
Irina Kamenskikh ◽  
Evgeny Tishchenko ◽  
Marco Kirm ◽  
Sergey Omelkov ◽  
Andrei Belsky ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Ionizing Radiation ◽  
Vacuum Ultraviolet ◽  
Dipole Interaction ◽  
Decay Kinetics ◽  
X Ray ◽  
Fast Detection ◽  
Nanostructured Composite ◽  
Diffusion Controlled ◽  
Frenkel Excitons

Characteristic dimensions and evolution times of regions of secondary electronic excitations created by the interaction of ionizing radiation with matter cannot be measured directly. At the same time these are essential parameters both for engineering of nanostructured composite materials defining optimal layer thickness and nanoparticles radii and for the development of optimized scintillators. The paper demonstrates how such spatial and temporal data can be extracted from luminescence decay kinetics excited by vacuum ultraviolet (VUV) and X-ray photons at modern sources of synchrotron radiation MAX IV and PETRA III. Specific features of energy-band structure of self-activated crystal CeF3 are discussed, and its potential for a super-fast detection of ionizing radiation evaluated. Diffusion-controlled dipole–dipole interaction of Frenkel excitons is demonstrated to account well for the luminescence non-exponential decay kinetics providing information on the scales of excited regions created by photons of different energy. For 20 eV photons the radius of excited regions is estimated to be 10 nm, and for 200 eV photons it increases to 18 nm. Effective radius of excited regions of complicated shape created by 19 keV is as large as 80 nm and the diffusion length of Frenkel excitons over radiative time is 14 nm.

scholarly journals Electronic excitations in ZnWO4 and ZnxNi1−x WO4 (x = 0.1 − 0.9) using VUV synchrotron radiation

Open Physics ◽  
2011 ◽  
Vol 9 (2) ◽  
Author(s):  
Aleksandr Kalinko ◽  
Alexey Kotlov ◽  
Alexei Kuzmin ◽  
Vladimir Pankratov ◽  
Anatoli Popov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Solid Solutions ◽  
Vacuum Ultraviolet ◽  
Localized States ◽  
Electronic Excitations ◽  
Photoluminescence Band ◽  
Excitation Spectra ◽  
X Ray ◽  
Electron Transitions ◽  
The One

AbstractThe photoluminescence spectra and luminescence excitation spectra of pure microcrystalline and nano-sized ZnWO4 as well as the ZnxNi1−x WO4 solid solutions were studied using vacuum ultraviolet (VUV) synchrotron radiation. The samples were also characterized by x-ray powder diffraction. We found that: (i) the shape of the photoluminescence band at 2.5 eV, being due to radiative electron transitions within the [WO6]6− anions, becomes modulated by the optical absorption of Ni2+ ions in the ZnxNi1−x WO4 solid solutions; and (ii) no significant change in the excitation spectra of Zn0.9Ni0.1WO4 is observed compared to pure ZnWO4. At the same time, a shift of the excitonic bands to smaller energies and a set of peaks, attributed to the one-electron transitions from the top of the valence band to quasi-localized states, were observed in the excitation spectrum of nano-sized ZnWO4.

scholarly journals Люминесценция примесных Pr-=SUP=-3+-=/SUP=--центров и дефектов в Sr-=SUB=-9-=/SUB=-Sc(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=-:Pr-=SUP=-3+-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 867
Author(s):  
В.А. Пустоваров ◽  
К.В. Ивановских ◽  
Ю.Е. Хатченко ◽  
В.Ю. Иванов ◽  
M. Bettinelli ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Vacuum Ultraviolet ◽  
Slow Component ◽  
Visible Spectrum ◽  
Luminescence Spectra ◽  
Decay Kinetics ◽  
X Ray ◽  
Spectroscopic Characteristics ◽  
Main Component ◽  
Kinetics Of

AbstractThe spectroscopic characteristics and luminescence decay kinetics of Sr_9Sc(PO_4)_7:Pr^3+(1%) were investigated using synchrotron radiation of ultraviolet (UV), vacuum ultraviolet (VUV) and X-ray ranges, as well as pulsed cathodoluminescence (PCL) methods at temperatures of 10, 90, and 295 K. The luminescence spectra contain three groups of bands and lines. In the UV range, the observed bands correspond to interconfigurational 5 d → 4 f transitions in Pr^3+ ions. In the visible spectrum, the wide luminescence band of defects dominates, as well as narrow lines associated with intraconfigurational 4 f → 4 f transitions in Pr^3+ ions. When excited by an electron beam (5 Hz), the main component with a decay time τ ∼ 17 ns dominates in the decay kinetics of the 5 d → 4 f luminescence. The decay kinetics of 5 d → 4 f luminescence upon excitation with high-frequency (τ ∼ 8 MHz) synchrotron radiation of the X-ray range contains a fast component (τ ∼ 15 ns) against the background of the slow component of the μs-range. An effective nonradiative energy transfer is observed from impurity centers to defects, as well as from the host to Pr^3+ ions and defects.

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