Stark shifts and widths of a hydrogen atom in Debye plasmas

Yu, A. C. H.; Ho, Y. K.

doi:10.1063/1.1867493

Cited by 42 publications

(22 citation statements)

References 21 publications

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“…2,3 For an atomic species embedded in a hot dense weakly coupled plasma in which the mean thermal energy of the plasma particles exceeds their electrostatic potential energy, the static screening of the intra-atomic potential(s) is described by the Debye screening model. 4 During the last two decades, this model has been employed in numerous theoretical studies [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] devoted to explore the influence of the so-called "Debye plasma" background on a variety of atomic phenomena (only a few representative studies are cited here).…”

Section: Introductionmentioning

confidence: 99%

Suppression of fine-structure splitting and oscillator strength of sodium D-line in a Debye plasma

Basu

Ray

2014

Physics of Plasmas

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We investigate theoretically the influence of static plasma screening on relativistic spin-orbit interaction-induced fine-structure splitting of the D-line doublet arising from the transitions 3p 1/2 -3s 1/2 and 3p 3/2 -3s 1/2 of the valence electron of a sodium atom embedded in a model plasma environment. The many-electron atomic problem is formulated first as an effective one-electron problem in which the interaction between the optically active valence electron and the atomic ion core is represented by an accurate parametric model potential including core-polarization correction, and then the plasma effect on the atomic system is simulated by the Debye-screening model for the valence-core interaction. It is observed that the magnitude of spin-orbit energy shift reduces for both the upper component 3p 3/2 and the lower component 3p 1/2 with increasing plasma screening strength, thereby reducing the spin-orbit energy separation between these two components as the screening becomes stronger. As a consequence, the magnitude of fine-structure splitting between the D 1 and D 2 line energies of sodium drops significantly with stronger plasma screening. The optical (absorption) oscillator strength for 3s ! 3p transition is seen to reduce with stronger screening and this leads to a screening-induced gradual suppression of the 3p ! 3s spontaneous decay rate. V C 2014 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Suppression of fine-structure splitting and oscillator strength of sodium D-line in a Debye plasma

Basu

Ray

2014

Physics of Plasmas

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“…Various theoretical methods have been used in different studies of this area, and many calculations have been applied to show the effects of plasmas on atomic structure. [8][9][10][11][12][13][14][15] Saha and co-workers have investigated the influence of Debye plasmas on hydrogen atoms by using the Screened Coulomb (SC) potential. 8 Following a proposal 16 that the exponential cosine screened Coulomb (ECSC) potential was more suitable for describing the effective electron-ion interaction in dense quantum plasmas, Paul and Ho solved Schr€ odinger equation using the generalized exponential cosine screened Coulomb potential.…”

Section: Introductionmentioning

confidence: 99%

The hydrogen atom in plasmas with an external electric field

Bahar

Soylu

2014

Physics of Plasmas

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We numerically solve the Schr€odinger equation, using a more general exponential cosine screened\ud Coulomb (MGECSC) potential with an electric field, in order to investigate the screening and weak\ud external electric field effects on the hydrogen atom in plasmas. The MGECSC potential is\ud examined for four different cases, corresponding to different screening parameters of the potential\ud and the external electric field. The influences of the different screening parameters and the weak\ud external electric field on the energy eigenvalues are determined by solving the corresponding\ud equations using the asymptotic iteration method (AIM). It is found that the corresponding energy\ud values shift when a weak external electric field is applied to the hydrogen atom in a plasma. This\ud study shows that a more general exponential cosine screened Coulomb potential allows the\ud influence of an applied, weak, external electric field on the hydrogen atom to be investigated in\ud detail, for both Debye and quantum plasmas simultaneously. This suggests that such a potential\ud would be useful in modeling similar effects in other applications of plasma physics, and that AIM\ud is an appropriate method for solving the Schr€odinger equation, the solution of which becomes\ud more complex due to the use of the MGECSC potential with an applied external electric field

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“…In recent years, several other aspects of atomic structures and properties in various plasma backgrounds have received the growing attention of the theoreticians. These include electric multipole oscillator strengths [3] and magnetic multipole transition rates [4] in * joyeebasu@yahoo.com † ray.debasis@gmail.com a stripped heliumlike ion, hydrogenic fine structures [5] and the diamagnetic response of a two-electron atomic ion [6,7], photoionization of hydrogenlike ions [8] and alkali atoms [9], doubly excited autoionizing states of the H − ion, the Ps − ion, and neutral helium [10][11][12], positron annihilation in the Ps − ion [13], Stark shifts and widths of a hydrogen atom [14] and static dipole polarizabilities of hydrogenlike ions [15], relativistic effects in the spectra of hydrogenlike ions [16], the dipole oscillator strengths for low-lying transitions in helium and lithium atoms [17], and the lowest allowed and intercombination transitions in berylliumlike ions [18,19]. Very recently, the plasma effects on stability, bound states, and dipole polarizability of a hydrogen molecular ion H + 2 have been addressed theoretically [20,21].…”

Section: Introductionmentioning

confidence: 99%

Dynamic polarizability of an atomic ion within a dense plasma

Basu

Ray

2011

Phys. Rev. E

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We analyze the influence of plasma electron density on frequency-dependent linear field-response behavior of an atomic ion embedded in a dense plasma medium. The frequency-dependent atomic response, characterized by the dynamic dipole polarizability α(d)(ω) as a function of the angular frequency ω of the time-dependent field, is estimated here up to the first pole of α(d)(ω) on the ω axis (corresponding to the lowest resonance transition 1s(2 1)S→1s2p(1)P) for the ground state 1s(2 1)S of a two-electron atomic ion Ne(8+) (Z = 10) at different plasma electron densities, as a typical example, employing the time-dependent coupled Hartree-Fock scheme within the framework of the ion-sphere model. It is observed that, owing to plasma density-induced enhancement of α(d)(ω) at every ω, the pole position of α(d)(ω) on the ω axis retracts toward the origin. This indicates a density-induced lowering (redshift) of the corresponding transition energy that conforms to experimentally observed trends. The polarizability calculation suggests a density-induced drop in the 1s(2 1)S→1s2p(1)P absorption oscillator strength in the atomic ion within dense plasmas.

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Stark shifts and widths of a hydrogen atom in Debye plasmas

Cited by 42 publications

References 21 publications

Suppression of fine-structure splitting and oscillator strength of sodium D-line in a Debye plasma

Suppression of fine-structure splitting and oscillator strength of sodium D-line in a Debye plasma

The hydrogen atom in plasmas with an external electric field

Dynamic polarizability of an atomic ion within a dense plasma

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