scholarly journals Photoelectron energy shift induced by microfocused x rays in micrometer-thick insulating layers

2003 ◽  
Vol 93 (11) ◽  
pp. 8982-8986 ◽  
Author(s):  
H. J. Shin ◽  
H. J. Song ◽  
M. K. Lee ◽  
G. B. Kim ◽  
C. K. Hong
Keyword(s):  
Energy Shift ◽  
X Rays ◽  
Photoelectron Energy

COMPOSITION AND OPTICAL CHARACTERISTICS OF ELECTROCHEMICALLY-SYNTHESIZED GaAs NANOCRYSTALS

2004 ◽  
Vol 03 (03) ◽  
pp. 281-292 ◽  
Author(s):  
J. NAYAK ◽  
S. VARMA ◽  
D. PARAMANIK ◽  
S. N. SAHU
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Energy Shift ◽  
Electrochemical Technique ◽  
X Rays ◽  
Emission Analysis ◽  
X Ray ◽  
The Core ◽  
Infrared Luminescence ◽  
Binding Energy Shift

The synthesis of the GaAs nanoparticles, having sizes 7 nm to 15 nm, by a low cost electrochemical technique has been reported. The absence of any foreign impurity has been confirmed by the Proton-Induced X-rays Emission analysis. Rutherford Backscattering measurement has been performed in order to estimate the thickness of the nanoparticle-generated thin film as a function of the electrolysis current density. The X-ray Photoelectron Spectroscopic study confirms the formation of GaAs and exhibits the binding energy shift of the core shell electrons as an implication of the nanostructure effect. Very weak infrared luminescence due to the radiative recombination of the impurity bound exciton has been detected from yttrium-doped GaAs nanocrystals, even at room temperature.

KAONIC HELIUM MEASUREMENTS IN THE SIDDHARTA EXPERIMENT

2011 ◽  
Vol 26 (03n04) ◽  
pp. 601-603
Author(s):  
◽  
D. L. SIRGHI ◽  
M. BAZZI ◽  
G. BEER ◽  
L. BOMBELLI ◽  
...  
Keyword(s):  
Energy Shift ◽  
High Energy ◽  
Low Energy ◽  
Kaonic Hydrogen ◽  
X Rays ◽  
X Ray ◽  
Kaonic Deuterium ◽  
Theoretical Predictions ◽  
First Time ◽  
Hadronic Atom

The SIDDHARTA experiment (SIlicon Drift Detector for Hadronic Atom Research by Timing Application) had the aim to perform kaonic atoms X-ray transitions measurements, to better understand aspects of the low-energy QCD in the strangeness sector. The experiment combined the excellent low-energy kaon beam generated at DAΦNE, allowing to use gaseous targets, with excellent fast X-rays detectors: Silicon Drift Detectors. SIDDHARTA was installed on DAΦNE in autumn 2008 and took data till late 2009. Apart of the kaonic hydrogen and kaonic deuterium measurements, we have performed the kaonic helium transitions to the 2p level ( L -lines) measurements: for the first time in a gaseous target for helium4 and for the first time ever for kaonic helium3. The interest for such type of measurement was rather high, being it triggered by two reasons: the so-called "kaonic helium puzzle" (even if this was solved by KEK-PS E570 experiment, but a cross-check was useful) and some theoretical predictions of possible high energy shift (at the level of 10 eV). In this paper the preliminary results for the measurements to the 2p level ( L -series) for kaonic helium4 and kaonic helium3 are presented.

Energy shift of electronic X-rays emitted from pionic atoms

2005 ◽  
Vol 93 (9-10) ◽  
Author(s):  
Kazuhiko Ninomiya ◽  
Hironori Sugiura ◽  
Yoshitaka Kasamatsu ◽  
Hidetoshi Kikunaga ◽  
Koichi Takamiya ◽  
...  
Keyword(s):  
Energy Shift ◽  
X Rays ◽  
Pionic Atoms

SummaryThe electronic

scholarly journals Properties of PbS: Ni2+ Nanocrystals in Thin Films by Chemical Bath Deposition

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
O. Portillo Moreno ◽  
L. A. Chaltel Lima ◽  
M. Chávez Portillo ◽  
S. Rosas Castilla ◽  
M. Zamora Tototzintle ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
Morphological Changes ◽  
Energy Shift ◽  
Dark Conductivity ◽  
Interplanar Distance ◽  
Bandgap Energy ◽  
X Rays ◽  
Ni Doping ◽  
Crystalline Films

The growth of nanocrystalline PbS films by chemical bath deposition (CBD) onto glass at temperature is presented in this research. We report on the modification of structural, optical, and electrical nanostructures due to in situ Ni-doping. The morphological changes of the layers were analyzed using SEM, AFM, and TEM. XRD spectra displayed peaks at 2θ = [26.00, 30.07, 43.10, 51.00, 53.48], indicating growth on the zinc blende face. The grain size determined by X-rays diffraction of the undoped samples was 36 nm, whereas with the doped sample was 3.2–5 nm. By TEM, the doped PbS was found crystalline films in the range 3.5–5 nm. Optical absorption (OA), and forbidden bandgap energy shift disclose a shift in the range 2.1–3.8 eV. Likewise, the dependence of with the radius size and interplanar distance of the lattice is discussed. Raman spectroscopy (RS) exhibited an absorption band 135 cm−1 displaying only a PbS ZB structure. The thermal energy for the films was determined from the slope of dark conductivity (DC) and the energy was estimated to be 0.15 to 0.5 eV.

scholarly journals Femtosecond electronic structure response to high intensity XFEL pulses probed by iron X-ray emission spectroscopy

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Roberto Alonso-Mori ◽  
Dimosthenis Sokaras ◽  
Marco Cammarata ◽  
Yuantao Ding ◽  
Yiping Feng ◽  
...  
Keyword(s):  
Electronic Structure ◽  
High Intensity ◽  
Pulse Length ◽  
Rapid Evolution ◽  
Emission Spectra ◽  
Energy Shift ◽  
Spectral Energy ◽  
X Rays ◽  
Time Resolved ◽  
X Ray

Abstract We report the time-resolved femtosecond evolution of the K-shell X-ray emission spectra of iron during high intensity illumination of X-rays in a micron-sized focused hard X-ray free electron laser (XFEL) beam. Detailed pulse length dependent measurements revealed that rapid spectral energy shift and broadening started within the first 10 fs of the X-ray illumination at intensity levels between 1017 and 1018 W cm-2. We attribute these spectral changes to the rapid evolution of high-density photoelectron mediated secondary collisional ionization processes upon the absorption of the incident XFEL radiation. These fast electronic processes, occurring at timescales well within the typical XFEL pulse durations (i.e., tens of fs), set the boundary conditions of the pulse intensity and sample parameters where the widely-accepted ‘probe-before-destroy’ measurement strategy can be adopted for electronic-structure related XFEL experiments.

CHEMICAL EFFECTS OF X-RAYS

1992 ◽  
Vol 02 (02) ◽  
pp. 93-106 ◽  
Author(s):  
K. YOSHIHARA ◽  
J. IIHARA
Keyword(s):  
Energy Shift ◽  
Emission Probability ◽  
Chemical Effect ◽  
X Rays ◽  
Satellite Formation ◽  
X Ray ◽  
Chemical Effects ◽  
Production Techniques ◽  
Profile Change

Various aspects of chemical effects on X-ray spectra such as energy shift, emission probability change, satellite formation and peak profile change are reviewed in recent studies. Applicability of the chemical effect to analysis of practical samples is also discussed. Though the emphasis is laid on PIXE, other X-ray production techniques are also taken into consideration because new trends of X-ray production and measurement are growing.

Excitation of Plasmons with X-rays

1973 ◽  
Vol 28 (5) ◽  
pp. 550-553 ◽  
Author(s):  
Kessar D. Alexopoulos
Keyword(s):  
Dielectric Constant ◽  
Surface Plasmons ◽  
Scattered Radiation ◽  
Energy Shift ◽  
Short Review ◽  
X Rays ◽  
Scattering Angle ◽  
X Ray ◽  
Second Category ◽  
Colloidal Materials

A short review is given of plasma phenomena produced in solids by impinging X-rays. The first category refers to bulk plamons due to X-ray photons scattered on solids. They are observed through the appearance of a new component in the spectrum of the scattered radiation. The energy shift increases slightly with scattering angle but eventually the dispersion stops. A second category of phenomena consists in the light emitted by decaying surface plasmons. They are excited by photoelectrons produced in colloidal materials by X-rays. The spectrum shifts with the dielectric constant of the stabilizing medium.

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