scholarly journals Angular Distribution of Characteristic Radiation Following the Excitation of He-Like Uranium in Relativistic Collisions

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 20
Author(s):  
Alexandre Gumberidze ◽  
Daniel B. Thorn ◽  
Andrey Surzhykov ◽  
Christopher J. Fontes ◽  
Dariusz Banaś ◽  
...  
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Theoretical Study ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Angular Distributions ◽  
Characteristic Radiation ◽  
Excitation Process ◽  
Excitation Processes ◽  
First Time

In this paper, we present an experimental and theoretical study of excitation processes for the heaviest stable helium-like ion, that is, He-like uranium occurring in relativistic collisions with hydrogen and argon targets. In particular, we concentrate on angular distributions of the characteristic Kα radiation following the K → L excitation of He-like uranium. We pay special attention to the magnetic sub-level population of the excited 1s2lj states, which is directly related to the angular distribution of the characteristic Kα radiation. We show that the experimental data can be well described by calculations taking into account the excitation by the target nucleus as well as by the target electrons. Moreover, we demonstrate for the first time an important influence of the electron-impact excitation process on the angular distributions of the Kα radiation produced by excitation of He-like uranium in collisions with different targets.

Electron–ion interactions for trapped highly charged Ge ions

2006 ◽  
Vol 84 (1) ◽  
pp. 67-81 ◽  
Author(s):  
G Machtoub ◽  
J.R. Crespo López-Urrutia ◽  
X Zhang ◽  
H Tawara
Keyword(s):  
Electron Beam ◽  
Cross Sections ◽  
Ion Trap ◽  
Dielectronic Recombination ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Theoretical Simulation ◽  
X Ray ◽  
New Information ◽  
Excitation Processes

A theoretical simulation of complex K X-ray spectra including those from dielectronic recombination and excitation processes is presented for trapped highly charged germanium ions ( Geq+, q = 27–30) interacting with a dense electron beam. We carried out numerical calculations of transition rates, level energies, transition wavelengths, resonance and collision strengths, and satellite intensity factors. Analytical results related to cross sections of B- through He-like Ge ions were obtained as well. The simulated spectra, including the contribution from different charge states of Ge27+–Ge30+, show good overall agreement over a wide electron energy range with the available X-ray measurements from the Heidelberg electron beam ion trap (EBIT). We have also predicted the electron impact excitation cross-section ratios for different transitions of Ge29+ and Ge30+ ions. It should be emphasized that the present analysis can also provide new information and clues of possible temperature measurements for EBIT and other plasma diagnostics.PACS No.: 32.30.Rj

A spectroscopic and theoretical study in the near-infrared region of low concentration aliphatic alcohols

2016 ◽  
Vol 18 (19) ◽  
pp. 13666-13682 ◽  
Author(s):  
Krzysztof B. Beć ◽  
Yoshisuke Futami ◽  
Marek J. Wójcik ◽  
Yukihiro Ozaki
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Near Infrared ◽  
Theoretical Study ◽  
Infrared Region ◽  
Second Order ◽  
Aliphatic Alcohols ◽  
Low Concentration ◽  
Near Infrared Region ◽  
First Time

The near-infrared (NIR) spectra of low-concentration (5 × 10−3 M) solutions in CCl4 of basic aliphatic alcohols, methanol, ethanol, and 1-propanol were, for the first time, calculated by second-order vibrational perturbation theory computations and were compared with the corresponding experimental data.

scholarly journals Effect of magnetic field on the expansion dynamics of laser-blow-off generated plasma plume: Role of atomic processes

2010 ◽  
Vol 28 (1) ◽  
pp. 121-127 ◽  
Author(s):  
Ajai Kumar ◽  
R.K. Singh ◽  
V. Prahlad ◽  
H.C. Joshi
Keyword(s):  
Magnetic Field ◽  
Variable Magnetic Field ◽  
Spectral Lines ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Processes ◽  
Atomic Analysis ◽  
First Time ◽  
The Magnetic Field

AbstractThe effect of a variable magnetic field on Li plasma produced by laser-blow-off technique has been studied experimentally. Enhancement in the intensity of the spectral lines from neutrals was observed, which varied with the magnetic field. The enhancement in emission from Li I was found to differ for the two different transitions viz. 670.8 nm (2s 2S1/2 ← 2p 2P3/2,1/2) and 610.3 nm (2p 2P1/2,3/2 ← 3d 2P3/2,5/2), which is more prominent for 670.8 nm. Conventionally, the enhancement in emission in the presence of the magnetic field has been explained in terms of radiative recombination. However, the atomic analysis by computing photon emissivity coefficients in the present case has revealed for the first time that it is due to electron impact excitation.

scholarly journals Model for Describing Emission Characteristics of Electron-Beam Evaporation Sources

1979 ◽  
Vol 6 (1) ◽  
pp. 9-12
Author(s):  
Miklós Szilágyi
Keyword(s):  
Experimental Data ◽  
Electron Beam ◽  
Angular Distribution ◽  
Simple Model ◽  
Electron Beam Evaporation ◽  
Angular Distributions ◽  
Emission Characteristics

The experimental data for the anistropic component of the angular distribution of electron-beam evaporation sources are usually described in terms of thecosnθdependence. In this paper a simple model for calculating angular distributions is presented. The generally used dependence appears as a particular case in the model.

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