Lifetimes of excited levels for atomic silicon

Ateş, Şule; Uğurtan, Hatice Hüda

doi:10.1007/s12648-012-0167-2

Cited by 10 publications

(7 citation statements)

References 42 publications

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“…And in past few years many elements in their atomic and ionic states were studied by this theory because of its semi-empirical nature. All these studies show remarkably good agreement in comparison with experimental results [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionsupporting

confidence: 65%

Precise Computation of Energy Levels and Radiative Lifetimes in the s, p, d, and f Sequence of Hydrogen Isotope, with Natural Line Widths

2019

JNSR

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Energy levels and Radiative lifetimes in Deuterium for the following: ns 2 S1/2(n≥2), np 2 P o (1/2,3/2)(n≥2), nd 2 D(3/2,5/2)(n≥3), and nf 2 F o (5/2,7/2)(n≥4) sequence have been evaluated with uncertainties in energies caused due to uncertainty principal. Theoretical calculations performed utilizing the Weakest Bound Electron Potential Model Theory (WBEPMT). Both sets of data show quite an excellent agreement with the experimental data listed at NIST. This theoretical computation is also a continuation of the work by Raza. S. et al. in Neutral Hydrogen. The high 'n' (principal quantum number) values for both sets of data are presented very first time by utilizing WBEPMT.

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Section: Introductionsupporting

confidence: 65%

Precise Computation of Energy Levels and Radiative Lifetimes in the s, p, d, and f Sequence of Hydrogen Isotope, with Natural Line Widths

2019

JNSR

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“…A good comparison of experimental and theoretical lifetimes is provided in Ref. [5], which illustrates that Si I lifetimes obtained with the Cowan code have significant deviations from the experiment and more accurate theories. In this paper we use CI-MBPT approach, which has not been applied to the Si I atom before.…”

Section: Introductionmentioning

confidence: 91%

Configuration-interaction many-body-perturbation-theory energy levels of four-valent Si i

Savukov

2015

Phys. Rev. A

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The mixed configuration-interaction many-body perturbation theory (CI-MBPT) method is accurate in divalent atoms. In more complex atoms, with the number of valence electrons it becomes progressively more difficult to saturate CI space. Here a four-valence electron atom, Si I, is considered. It is found that by using a relatively small cavity of 30 a.u. and by choosing carefully configuration space, it is possible to obtain quite accurate agreement between the theory and experiment. After subtraction of systematic shifts of 481 cm −1 and-426 cm −1 for the lowest even states and odd states respectively,the deviation between theory and experiment becomes at the level of 100 cm −1. This agreement is comparable to that in divalent atoms where the CI saturation has been achieved. It is anticipated that the approach can also give good results for atoms with more valence electrons to be considered in the future.

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“…Semiempirical methods that can accurately reproduce energy levels do not necessarily lead to accurate lifetimes and transitions rates, as illustrated in Ref. [7] where the lifetimes obtained with the Cowan code [8] showed significant deviations from those obtained experimentally and with ab initio theories.…”

Section: Introductionmentioning

confidence: 99%

Configuration-interaction plus many-body-perturbation-theory calculations of Si i transition probabilities, oscillator strengths, and lifetimes

Savukov

2016

Phys. Rev. A

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The precision of mixed configuration-interaction many-body perturbation theory (CI+MBPT) method is limited in multi-valence atoms by the large size of valence CI space. Previously, to study this problem, the CI+MBPT method was applied to calculations of energies in a four-valence electron atom, Si I. It was found that by using a relatively small cavity of 30 a.u. and by choosing carefully the configuration space, quite accurate agreement between theory and experiment at the level of 100 cm −1 can be obtained, especially after subtraction of systematic shifts for groups of states of the same J and parity. However, other properties are also important to investigate. In this work, the CI+MBPT method is applied to studies of transition probabilities, oscillator strengths, and lifetimes. A close agreement with accurate experimental measurements and other elaborate theories is obtained. The long-term goal is to extend CI+MBPT approach to applications in more complex atoms, such as lantanides and actinides.

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Lifetimes of excited levels for atomic silicon

Cited by 10 publications

References 42 publications

Precise Computation of Energy Levels and Radiative Lifetimes in the s, p, d, and f Sequence of Hydrogen Isotope, with Natural Line Widths

Precise Computation of Energy Levels and Radiative Lifetimes in the s, p, d, and f Sequence of Hydrogen Isotope, with Natural Line Widths

Configuration-interaction many-body-perturbation-theory energy levels of four-valent Si i

Configuration-interaction plus many-body-perturbation-theory calculations of Si i transition probabilities, oscillator strengths, and lifetimes

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