Quantum Stark broadening of 3s–3p spectral lines in Li-like ions; Z-scaling and comparison with semi-classical perturbation theory

Nessib

2014

Atoms

"Stark broadening" theory and calculations have been extensively developed for about 50 years. The theory can now be considered as mature for many applications, especially for accurate spectroscopic diagnostics and modeling, in astrophysics, laboratory plasma physics and technological plasmas, as well. This requires the knowledge of numerous collisional line profiles. In order to meet these needs, the "SCP" (semiclassical perturbation) method and numerical code were created and developed. The SCP code is now extensively used for the needs of spectroscopic diagnostics and modeling, and the results of the published calculations are displayed in the STARK-B database. The aim of the present paper is to introduce the main approximations leading to the impact of semiclassical perturbation method and to give formulae entering the numerical SCP code, in order to understand the validity conditions of the method and of the results; and also to understand some regularities and systematic trends. This would Atoms 2014, 2 226 also allow one to compare the method and its results to those of other methods and codes. 1

Section: Modifications In Progress and Prospectsmentioning

confidence: 53%

“…This is shown in [37], for instance; cf. Figure 20 of that paper, which shows a −1.84 slope for the 3s − 3p transitions from C IV to P XIII.…”

Section: Behavior With the Charge Of The Radiating Ionmentioning

confidence: 81%

Section: Accuracy Of the Scp Methodsmentioning

confidence: 99%

Section: Behavior With the Charge Of The Radiating Ionmentioning

confidence: 98%

See 2 more Smart Citations

Widths and Shifts of Isolated Lines of Neutral and Ionized Atoms Perturbed by Collisions With Electrons and Ions: An Outline of the Semiclassical Perturbation (SCP) Method and of the Approximations Used for the Calculations

Nessib

2014

Atoms

“…The quantum mechanical expression for electron impact broadening calculations for intermediate coupling was obtained from Elabidi, Ben Nessib & Sahal‐Bréchot (2004). We performed the first applications for the 2s3s–2s3p transitions in Be‐like ions from nitrogen to neon (Elabidi et al 2007, 2008a) and for the 3s–3p transitions in Li‐like ions from carbon to phosphor (Elabidi, Ben Nessib & Sahal‐Bréchot 2008b; Elabidi, Sahal‐Bréchot & Ben Nessib 2009). This approach was also used in Elabidi & Sahal‐Bréchot (2011) to check the dependence on the upper‐level ionization potential of electron impact widths.…”

Section: Introductionmentioning

confidence: 99%

Quantum Stark broadening data for the C iv, N v, O vi, F vii and Ne viii resonance doublets

Elabidi

Monthly Notices of the Royal Astronomical Society

et al. 2011

Self Cite

In this paper, we present new Stark electron impact widths of the 2s–2p resonance doublets of the C iv, N v, O vi, F vii and Ne viii ions, obtained using our quantum mechanical method. The present results are required to develop future spectral analysis using non‐local thermodynamic equilibrium model atmospheres, which can make the determination of photospheric properties more accurate. Results are presented for a large range of electron temperatures required for plasma modelling. These are compared to the available theoretical ones. They are also used to check the previously obtained semiclassical perturbation results, and very good agreement is found. The atomic structure and collision data, used for the calculations of line broadening for the five ions studied here, are also calculated and compared to available theoretical results. The agreement found between the two calculations ensures that our line‐broadening procedure uses the adequate structure and collision data. Scalings of linewidths with effective charge Z are also studied.

The STARK-B database as a resource for “STARK” widths and shifts data: State of advancement and program of development

Advances in Space Research

Moreau

et al. 2014

Abstract"Stark" broadening theories and calculations have been extensively developed for about 50 years and can now be applied to many needs, especially for accurate spectroscopic diagnostics and modeling. This requires the knowledge of numerous collisional line profiles. Nowadays, the access to such data via an online database becomes essential. STARK-B is a collaborative project between the Astronomical Observatory of Belgrade and the Laboratoire d'Étude du Rayonnement et de la matière en Astrophysique (LERMA). It is a database of calculated widths and shifts of isolated lines of atoms and ions due to electron and ion collisions (impacts). It is devoted to modeling and spectroscopic diagnostics of stellar atmospheres and envelopes, laboratory plasmas, laser equipments and technological plasmas. Hence, the domain of temperatures and densities covered by the tables is wide and depends on the ionization degree of the considered ion. STARK-B has been fully opened since September 2008 and is in free access.The first stage of development was ended in autumn 2012, since all the existing data calculated with the impact semiclassical-perturbation method and code by Sahal-Bréchot, Dimitrijević and coworkers have now been implemented. We are now beginning the second stage of the development of STARK-B. The state of advancement of the database and our program of development are presented here, together with its context within VAMDC. VAMDC (Virtual Atomic and Molecular Data Center) is an international consortium which has built a secure, documented, flexible interoperable platform e-science permitting an automated exchange of atomic and molecular data.