Abstract Given its abundance in the interstellar medium recently justified by astronomical observations, chemistry and reactivity of metal-bearing molecule MgS require special attention. The availability up-to-date collision data between this most abundant perturbing species H2 He is an essential resource to derive reliable values molecular from observations. This work aims provide improved scattering parameters for system with He. A new two-dimensional potential energy surface (2D-PES)...

In the present paper, we revisit determination of Feshbach resonances in elastic and fine-structure cross-sections spectral lines ionized atoms colliding with electrons. The Gailitis approximation will be recalled used to calculate resonances. A historical point view used, emphasizing interest interdisciplinary research, a back forth between physics astrophysics. First, theory (arising at end 1950s beginning 1960s) briefly applied calculation cross-sections. 1970s, insertion spectroscopic...

Abstract While the rotational spectroscopy of thiofulminic acid (HCNS), one isomers isothiocyanic (HNCS) is established, there no study its collisional excitation. In this work, we present first rate coefficients calculation newly observed HCNS(X1Σ+) colliding with He. To perform this, two-dimensional potential energy surface (2D-PES) calculated using explicitly correlated coupled cluster single, double and perturbative triple excitations [CCSD(T)-F12] method in conjunction aug-cc-pVTZ basis...

We present in this paper quantum mechanical calculations for the electron impact Stark linewidths of 2s3s–2s3p transitions four beryllium-like ions from N IV to Ne VII. Calculations are made frame approximation and intermediate coupling, taking into account fine-structure effects. A comparison between our calculations, experimental other theoretical results, shows a good agreement. This is first time that such agreement found highly charged ions.

A new quantum mechanical expression for calculating electron-impact broadening is obtained intermediate coupling. It would be especially useful calculations of widths and shifts fine structure spectral lines multicharged ions where LS coupling breaks down.

We present in this paper the results of a theoretical study electron impact broadening for several lines Ar VII ion. The have been obtained using our quantum mechanical method and semiclassical perturbation one. Results are presented density 1018 cm−3 temperatures ranging from 2 × 10 4 to 5 K required plasma modeling. Our compared other ones different sources atomic data. A strong collisions contributions line has performed. structure collision data used calculations also calculated by codes...

We investigate the transmittance spectrum of a multichannel filter composed dielectric (A) and plasma (P) materials in microwave region within transfer matrix formalism. Two configurations proposed are studied under influence an applied magnetic field: (1) periodic structure containing (A/P)N unit cells surrounded by air (2) introduction second material (D) acting as defect layer to produce (AP)N/2/D/(AP)N/2 structure. Our findings reveal that case, number resonant states increases with N;...

ABSTRACT Determining physical conditions in interstellar environments requires reliable estimation of collisional data for molecules detected space. In this work, we report a rate coefficients calculation MgC3N(X2Σ+) induced by collision with He. This study is based on new 2D potential energy surface (2D-PES), obtained from the explicitly correlated restricted open-shell coupled cluster approach single, double, and perturbative triple excitation (rccsd(t)-f12) aug-cc-pVTZ basis sets. The...

We present in this paper quantum Stark broadening data for 14 Ar viii and 16 ix lines. For the ion, we compare our results to those calculated using semiclassical method find an acceptable agreement. performed also a comparison between importance of Doppler atmospheric conditions DO white dwarfs. To best knowledge, widths provided ion are new, no have been found literature with. some atomic radiative used calculations, them other results. The shows Our come fill lack line necessary stellar...

In this paper, we present new Stark electron impact widths of the 2s–2p resonance doublets C iv, N v, O vi, F vii and Ne viii ions, obtained using our quantum mechanical method. The results are required to develop future spectral analysis non-local thermodynamic equilibrium model atmospheres, which can make determination photospheric properties more accurate. Results presented for a large range temperatures plasma modelling. These compared available theoretical ones. They also used check...

Energy levels, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for six times ionized sulfur S VII. The atomic data calculated with the SUPERSTRUCTURE code, where relativistic corrections introduced according to Breit–Pauli approach. We include in this work (1s2) 2s22p6, 2s22p53l, 2s2p63l, 2s22p54l (l ⩽ n − 1) configurations that yield lowest 75 levels. scattering problem is treated distorted wave approach by code DISTORTED WAVE. This produces...

We present in this paper new electron impact widths for 12 Ar v and 22 vi lines. Neither experimental nor theoretical results have been found these ions to perform comparisons. The obtained using our quantum mechanical method. Results are presented an density Ne = 1018 cm−3 at a large range of temperatures (2 × 104–106 K) required plasma modelling. atomic structure collision data used the calculations line broadening also calculated by codes. use fit dependence on temperature. check that...

Context. This paper provides missing Stark broadening of the Br VI and Kr V-VII lines recently discovered in ultraviolet spectrum hot white dwarf RE 0503–289 investigates importance mechanism versus Doppler that star. As far as we know, this is first time widths have been calculated. Aims. The recent discovery new encourages us to provide their enrich STARK-B database for use interpretations observed spectra. Methods. We used our quantum mechanical method calculating electron impact widths....

We present the first detailed study of optical absorption coefficients (OACs) in a GaAs quantum dot confined with Woods–Saxon potential containing hydrogenic impurity at its center. use finite difference method to solve Schrödinger equation within framework effective mass approximation. First, we compute energy levels and probability densities for different parameters governing confining potential. then calculate dipole matrix elements differences, E1p−E1s, discuss their role respect OACs....

Radiative atomic and electron impact excitation data for O v vi ions have been calculated. The radiative calculated with the autostructure code. Besides one-body two-body fine structure interactions, non-fine operators of Breit–Pauli Hamiltonian, namely contact spin–spin, Darwin orbit–orbit are incorporated in autostructure. scattering problem has treated distorted wave approximation using same code calculations extended from 46 to 92 levels. We cross-sections 2s2-2s2p 2s-2p transitions at...

ABSTRACT Stark widths for 31 spectral lines of the zirconium ions Zr iv, v and vi are calculated using a quantum mechanical method, five other they deduced from linear fit. Among these lines, 23 provided first time. The motivation this work was recent identification 25 in UV spectrum hot white dwarf RE 0503−289, which have never been detected before dwarfs. results presented plasma conditions found atmospheres. To best our knowledge, broadening calculations only carried out iv ion....

ABSTRACT Missing Stark widths for 37 spectral lines of strontium ions (17 Sr v and 20 vi lines) have been calculated using a quantum-mechanical method. Twenty-three recently discovered, the first time, in ultraviolet spectrum hot white dwarf RE 0503−289. This recent discovery prompts us to calculate new lines. These calculations can fill lack data base STARK-B be used investigate observed spectra such stars. To perform line broadening calculations, preliminary structure collision carried out...

We present in this paper new Stark broadening parameters of analogous spectral lines (2s22p23p−2s22p23s) along the nitrogen iso-electronic sequence. The studied ions are Na v, Mg vi, Al vii, and Si viii. also widths for arising from transition arrays 2s2p4−2s22p3 2s22p23s−2s22p3. Neither experimental nor theoretical results have been found all these to perform comparisons. obtained using our quantum mechanical method. use calculated establish a relationship between width effective charge Z...