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Oscillator Strengths for Allowed Transitions in Li(II)

100%
Ateş Ş., Çelik G.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 2
169-175
EN
Electric dipole oscillator strengths have been computed for transitions between both multiplet and individual lines in the Li(II) ion. The weakest bound electron potential model theory has been used. We have employed both numerical Coulomb approximation wave functions and numerical non-relativistic Hartree-Fock wave functions in the determination of expectation values of radii. The necessary energy values have been taken from experimental ionization energies. The oscillator strengths calculated with parameters obtained by using the two different wave functions have been compared not only to each other but also to other data taken from literature. A good agreement with results in literature has been obtained.
2
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Calculations of Transition Probabilities for Some Excited Levels of Na I

100%
Çelik G., Ateş Ş.
Acta Physica Polonica A
|
2008
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vol. 113
|
issue 6
1619-1627
EN
Transition probabilities are calculated for individual and multiplet lines between some excited states in neutral sodium by using the weakest bound electron potential model theory. In the determination of parameters required for calculation of transition probabilities, we employed numerical non-relativistic Hartree-Fock wave functions for expectation values of radii in all levels. The necessary energy values were taken from experimental energy data in the literature. The obtained results were compared with accepted values taken from National Institute of Standards and Technology data and multi-configurational Hartree-Fock results given by Fischer. A good agreement was observed in related excited states.
3
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Radiative Lifetimes for Singly Ionized Beryllium

81%
Çelik G., Atalay B., Ateş Ş.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 3
705-709
EN
The theoretical lifetimes for singly ionized beryllium (Be II) have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory under the assumption of the LS coupling scheme. In the calculations, many states are considered. Some lifetime values for highly excited levels have been obtained using these methods. The lifetimes presented in this work have been compared with the early theoretical calculations and measurements presented in the literature. A good agreement with the results in the literature has been obtained.
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