scholarly journals High resolution X-ray emission spectra from picosecond laser irradiated Ge targets

2007 ◽  
Vol 25 (2) ◽  
pp. 245-252 ◽  
Author(s):  
J. Abdallah ◽  
D. Batani ◽  
T. Desai ◽  
G. Lucchini ◽  
A. Faenov ◽  
...  
Keyword(s):  
High Resolution ◽  
Laser System ◽  
Wavelength Region ◽  
Emission Spectra ◽  
Picosecond Laser ◽  
High Repetition Rate ◽  
Spectral Lines ◽  
X Ray ◽  
High Bulk ◽  
Better Than

Investigations of a high resolution X-ray emission spectrum in the range 0.66–0.75 nm obtained by irradiating a Germanium target with high-power p-polarized, 40 picosecond laser radiation at 532 nm wavelength was done. Spectra in the wavelength region of 2l-4l′ and 2l-5l′ L-shell transitions in F-like, Ne-like and Na-like germanium ions were recorded using the FSSR-2D spectrometer equipped with a spherically bent quartz crystal with a spectral resolution λ/Δλ better than 5000. Spectral lines were compared with theoretical values obtained using the LANL plasma kinetic code ATOMIC. Fair agreement between experimental and theoretical spectral lines has been observed, which allowed to measure enough high bulk electron temperature values of 560 eV and electron density of ∼1021 cm−3 in Ge plasma irradiated by rather small commercial high repetition rate Nd:YAG laser system.

scholarly journals Laser-produced plasma-wall interaction

2009 ◽  
Vol 27 (4) ◽  
pp. 725-731 ◽  
Author(s):  
O. Renner ◽  
R. Liska ◽  
F.B. Rosmej
Keyword(s):  
High Resolution ◽  
Laser System ◽  
Emission Spectra ◽  
Plasma Jets ◽  
Research Centre ◽  
High Dispersion ◽  
X Ray ◽  
Hot Plasma ◽  
Laser Produced Plasma ◽  
Wall Interaction

AbstractJets of laser–generated plasma represent a flexible and well-defined model environment for investigation of plasma interactions with solid surfaces (walls). The pilot experiments carried out on the iodine laser system (5–200 J, 0.44 µm, 0.25–0.3 ns, <1×1016 W/cm2) at the PALS Research Centre in Prague are reported. Modification of macroscopic characteristics of the Al plasma jets produced at laser-irradiated double-foil Al/Mg targets is studied by high-resolution, high-dispersion X-ray spectroscopy. The spatially variable, complex satellite structure observed in emission spectra of the Al Lyα group proves a formation of rather cold dense plasma at the laser-exploded Al foil, an occurrence of the hot plasma between both foils and subsequent thermalization, deceleration and trapping of Al ions in the colliding plasma close to the Mg foil surface. The spectra interpretation based on the collisional-radiative code is complemented by 1D and 2D hydrodynamic modeling of the plasma expansion and interaction of counter-propagating Al/Mg plasmas. The obtained results demonstrate a potential of high resolution X-ray diagnostics in investigation of the laser-produced plasma–wall interactions.

scholarly journals Main spectral features of meteors studied using a terawatt-class high-power laser

2019 ◽  
Vol 630 ◽  
pp. A127 ◽  
Author(s):  
M. Ferus ◽  
P. Kubelík ◽  
L. Petera ◽  
L. Lenža ◽  
J. Koukal ◽  
...  
Keyword(s):  
Experimental Data ◽  
Spectral Analysis ◽  
High Resolution ◽  
High Power ◽  
Laser System ◽  
Emission Spectra ◽  
Spectral Lines ◽  
Spectral Features ◽  
Low Resolution ◽  
Meteor Plasma

Context. Meteor spectra are commonly interpreted using data from databases and tables. Several studies have demonstrated very sophisticated calculations of elemental compositions of meteoroid bodies based on the computation of synthetic meteor spectra or on the spectral analysis of airglow plasma containing evaporated, atomized, and ionized meteoroid matter. However, considering accuracy, reliability of computations, lack of laboratory experimental data in this field, as well as the complicated physical structure of meteor plasma, such qualitative assignment or quantitative calculations are still extensively discussed in the scientific community. Even on the laboratory level, many studies have shown the high complexity of the acquisition and interpretation of the data that are recorded with techniques of emission spectroscopy that are in fashion and philosophy similar to the spectral analysis of meteor plasma, that is, detection and quantification of the elements that are ablated from complicated multicomponent matrices. Aims. The current study is focused on the application of terawatt-class laser-induced breakdown spectroscopy (TC-LIBS) of real samples of chondritic meteorites. We recorded emission spectra with high resolution and high precision that contain spectral lines that are typical for real meteoric spectra. Experimental data were compiled in a form that is convenient for the meteoric spectra interpretation and calibration. Methods. TC-LIBS was carried out by a high-power terawatt-class laser facility, the Prague Asterix Laser System (PALS). The spectra were simultaneously recorded by an echelle high-resolution spectrograph in the UV/VIS spectral ranges and by a low-resolution spectrograph that was used for real observation of meteor spectra. We also present calculated synthetic spectra based on data from the NIST atomic spectra database. Results. We assembled etalon qualitative tables of major meteoric spectral features that can be used both for the spectral wavelength calibration of low-resolution observational instruments and for the exact interpretation of meteor spectra. The data are compared with real meteor spectra.

Nano-probe x-ray analysis and high-resolution imaging on planar defects in high-pressure synthesized infinite-layer superconductor

1994 ◽  
Vol 52 ◽  
pp. 728-729
Author(s):  
Y. Y. Wang ◽  
H. Zhang ◽  
V. P. Dravid ◽  
H. Zhang ◽  
L. D. Marks ◽  
...  
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
Atomic Structure ◽  
Emission Spectra ◽  
High Resolution Electron Microscopy ◽  
Planar Defects ◽  
X Ray ◽  
Infinite Layer ◽  
Resolution Electron ◽  
Resolution Imaging

Azuma et al. observed planar defects in a high pressure synthesized infinitelayer compound (i.e. ACuO2 (A=cation)), which exhibits superconductivity at ~110 K. It was proposed that the defects are cation deficient and that the superconductivity in this material is related to the planar defects. In this report, we present quantitative analysis of the planar defects utilizing nanometer probe xray microanalysis, high resolution electron microscopy, and image simulation to determine the chemical composition and atomic structure of the planar defects. We propose an atomic structure model for the planar defects.Infinite-layer samples with the nominal chemical formula, (Sr1-xCax)yCuO2 (x=0.3; y=0.9,1.0,1.1), were prepared using solid state synthesized low pressure forms of (Sr1-xCax)CuO2 with additions of CuO or (Sr1-xCax)2CuO3, followed by a high pressure treatment.Quantitative x-ray microanalysis, with a 1 nm probe, was performed using a cold field emission gun TEM (Hitachi HF-2000) equipped with an Oxford Pentafet thin-window x-ray detector. The probe was positioned on the planar defects, which has a 0.74 nm width, and x-ray emission spectra from the defects were compared with those obtained from vicinity regions.

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.

HIGH RESOLUTION L X-RAY EMISSION SPECTRA OF Fe AND Cu INDUCED BY O.75 MeV/u ION IMPACT

1995 ◽  
Vol 05 (02n03) ◽  
pp. 203-209 ◽  
Author(s):  
H. KAGEYAMA ◽  
R. TAKAHASHI ◽  
D. HAMAGUCHI ◽  
T. AWATA ◽  
T. NAKAE ◽  
...  
Keyword(s):  
High Resolution ◽  
Lower Energy ◽  
Emission Spectra ◽  
Crystal Spectrometer ◽  
Transition Energies ◽  
X Ray ◽  
The Difference ◽  
Ion Impact ◽  
Electron Vacancy ◽  
Good Agreement

High resolution L x-ray emission spectra of Fe and Cu have been measured by 0.75 MeV/u H and He, and 0.73 MeV/u He, Si and Ar ion impacts with a crystal spectrometer. The x-ray transition energies in the Fe and Cu targets for Lι, Lη, Lα1,2, Lβ1 and Lβ3,4 diagram lines induced by light ion impacts are determined, which are in good agreement with those given in the reference. The difference in L x-ray emission spectra produced by H, He, Si and Ar ions is considered and the emission spectra for the Cu target are compared with the calculated ones based on the multiconfiguration Dirac-Fock method. The origin of the broadening of the Lα1,2 line to the lower energy for Si and Ar ion impacts is attributed to one 2p plus one 3d electron vacancy production.

Large-field high-resolution x-ray monochromatic microscope based on spherical crystals and high-repetition-rate laser-produced plasmas

1999 ◽  
Author(s):  
Tatiana A. Pikuz ◽  
Anatoly Y. Faenov ◽  
Moshe Fraenkel ◽  
Arie Zigler ◽  
Francesco Flora ◽  
...  
Keyword(s):  
High Resolution ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Large Field ◽  
X Ray ◽  
High Repetition ◽  
Spherical Crystals

High-resolution atomic structures of rubidium compounds in L X-ray spectral lines: a promising exploration for chemical analysis

2020 ◽  
Vol 35 (6) ◽  
pp. 1187-1198
Author(s):  
Harpreet Singh Kainth
Keyword(s):  
High Resolution ◽  
Chemical Analysis ◽  
Profile Analysis ◽  
Spectral Lines ◽  
Chemical Profile ◽  
X Ray ◽  
Atomic Structures ◽  
Materials Used ◽  
Xrf Spectroscopy

X-ray fluorescence (XRF) spectroscopy has made a significant impact on the chemical profile analysis of various materials used for industrial and medical purposes.

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