Multicharged Xei+ ions formed after de-excitation of inner-shell vacancies in Xe atom

2004 ◽  
Vol 82 (10) ◽  
pp. 811-818 ◽  
Author(s):  
Adel M El-Shemi
Keyword(s):  
Main Product ◽  
Fluorescence Yield ◽  
Monte Carlo Algorithm ◽  
Hole State ◽  
Radiative Transitions ◽  
Charge State Distributions ◽  
Nonradiative Transitions ◽  
Shell Vacancy ◽  
Shell Ionization ◽  
Vacancy State

Multicharged Xe ions following de-excitation of K-, L1-, L2,3-, M1-, M2,3-, and M4,5-subshell vacancies are calculated using a Monte-Carlo algorithm to simulate the vacancy cascade development. Fluorescence yield (radiative) and Auger and Coster–Kronig yields (nonradiative) are evaluated. The decay of the K hole state through radiative transitions is found to be more probable than through nonradiative transitions in the first step of de-excitation. On the other hand, the decay of L and M vacancies through nonradiative transitions are more probable. Ions, mainly produced from Xe in the K-shell vacancy state, are found to be Xe7+, Xe8+, Xe9+, and Xe10+. The charged Xe8+ ions predominate in the charge state distributions. The main product from the L1-shell ionization is found to be Xe8+ and Xe9+ ions, while the Xe8+ ions predominate at the L2,3 hole states. The charged Xe6+, Xe7+, and Xe8+ ions come mainly from 3s1/2 and 3p1/2,3/2 ionization, while Xe in 3d3/2,5/2 hole states becomes mainly Xe4+ and Xe5+ ions. The present results are found to agree well with the experimental data.PACS No.: 32.40.Hd

Role of Non-Radiative Transitions in X-RAY Analysis

1990 ◽  
Vol 48 (2) ◽  
pp. 10-11
Author(s):  
János L. Lábár
Keyword(s):  
Excited Atom ◽  
Fluorescence Yield ◽  
Initial State ◽  
Radiative Process ◽  
X Ray ◽  
Radiative Processes ◽  
Radiative Transitions ◽  
The Given ◽  
Electron Shells

Radiative and non-radiative transitions present alternative ways for the excited atom to reduce its energy when the initial state is an atom singly ionised in one of its inner electron shells. Since the fluorescence yield gives the probability that the empty state in the inner (sub)shell is filled in by a radiative process, it seems that the generated x-ray intensities are independent of the non-radiative rearrangements from the point on where the value of fluorescence yield is given for the (sub)shell in question. In that way the intensity of an x-ray line would solely be dependent on the ionisation probability of the given (sub)shell and on the rates of the radiative transitions (determining the relative intensities of the lines originating from the same subshell). That image involves that the non-radiative processes only influence the value of the fluorescence yield. For the simplest case i.e. for the K shell it is true.

Relativistic calculation of the K-LL Auger spectrum

1959 ◽  
Vol 249 (1259) ◽  
pp. 555-573 ◽  
Keyword(s):  
Auger Spectrum ◽  
Relativistic Effects ◽  
Fluorescence Yield ◽  
Numerical Calculations ◽  
Approximate Estimate ◽  
Radiative Transitions ◽  
Relativistic Calculation ◽  
Electronic Computers ◽  
Good Agreement

Extensive relativistic calculations have been carried out for the K -L L Auger spectrum of mercury based on Moller’s semi-classical treatment for the interaction of radiation with electrons. Numerical calculations using electronic computers give, for the relative intensities and position of the different lines of the spectrum, values in very good agreement with observation and remove the discrepancies obtained earlier by Massey & Burhop for some of them. It is found that relativistic effects increase the Auger transitions by about 84% and decrease the radiative transitions by about 75%. An approximate estimate for the k-series fluorescence yield w k of 0.961 is also obtained.

scholarly journals X-Ray Satellite Lines

1984 ◽  
Vol 86 ◽  
pp. 36-36
Author(s):  
J. Dubau
Keyword(s):  
Transition Probabilities ◽  
Relativistic Effects ◽  
Radiative Transition ◽  
Electron System ◽  
Great Accuracy ◽  
Atomic Data ◽  
X Ray ◽  
Spectroscopic Diagnostics ◽  
Radiative Transitions ◽  
Shell Vacancy

Satellite lines are typical features of X-ray spectra. They correspond to radiative transitions involving an inner-shell vacancy. The most studied satellite lines are of the - type, i.e., (ls–2p) transition.With the advent of Space Astronomy, X-ray spectra emitted by very hot solar plasma have been obtained. By a simple comparison of different spectra, it appears that, for highly ionized atoms, some satellite lines have intensities as large as resonance lines intensities and, more particularly, this is the case for the ls2n. – ls 2pn satellite lines of the 1s2 – ls2p resonance lines.The analysis of the different population mechanisms responsible for the satellite lines and resonance lines emission has shown that different spectroscopic diagnostics could be derived from line ratios only if atomic data of great accuracy were available. There exists nowadays different atomic data programs adapted to X-ray satellite lines. They have in common to give a great amount of data simultaneously: wavelengths, autoionization and radiative transition probabilities. They take into account correlation and relativistic effects.After tackling the simple 3-electron system, the programs give now appropriate data for more complex systems but this required large computers because the lines become blended. It is therefore impossible to limit the calculation to the most intense lines.

Decay of the double–K-shell-vacancy state in silver atoms created in the decay ofCd109

1985 ◽  
Vol 31 (3) ◽  
pp. 1543-1550 ◽  
Author(s):  
V. Horvat ◽  
K. Ilakovac
Keyword(s):  
Shell Vacancy ◽  
Vacancy State ◽  
Silver Atoms

Computation of Ion Charge State Distributions After Inner-Shell Ionization In Ne, Ar And Kr Atoms Using Monte Carlo Simulation

2010 ◽  
Author(s):  
Adel M. Mohammedein ◽  
Adel A. Ghoneim ◽  
Jasem M. Al-Zanki ◽  
Ashraf H. El-Essawy ◽  
Abdul Aziz Bin Mohamed
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Charge State ◽  
Charge State Distributions ◽  
Inner Shell Ionization ◽  
Shell Ionization

L-shell ionization of atoms and their subsequent decay by radiative and non-radiative transitions

Pramana ◽  
1998 ◽  
Vol 50 (6) ◽  
pp. 669-681 ◽  
Author(s):  
P Venugopala Rao
Keyword(s):  
Subsequent Decay ◽  
Radiative Transitions ◽  
Shell Ionization

Calculation of Ion Charge State Distributions After Inner-Shell Ionization in Xe Atom

2010 ◽  
Author(s):  
Adel M. Mohammedein ◽  
Adel A. Ghoneim ◽  
Kandil M. Kandil ◽  
Ibrahim M. Kadad ◽  
Abdul Aziz Bin Mohamed
Keyword(s):  
Charge State ◽  
Charge State Distributions ◽  
Inner Shell Ionization ◽  
Shell Ionization
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