Stark broadening of hydrogen lines in the presence of a magnetic field is revisited, with emphasis on the role of the ion component under typical conditions of magnetized fusion devices. An impact theory for ions valid at low density (N_{e} < or approximately 10;{14} cm;{-3}) and taking into account the Zeeman degeneracy removal of the atomic states is developed. It is shown that the Stark widths of the Lorentz triplet components strongly depend on the magnetic field. The model is validated by a computer simulation method. For the lateral sigma components of Lyalpha , we show that the impact approximation still holds for densities as high as N_{e} approximately 10;{15} cm;{-3}. In contrast, for the central pi component as well as for the other lines from low principal quantum number, significant discrepancies between the proposed theory and the simulation results appear at high density. Application to Dalpha in tokamak divertor plasma conditions shows that, in this case, the quasistatic approximation becomes more relevant.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevE.79.046408 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Genome-wide association analyses identify distinct genetic architectures for age-related macular degeneration across ancestries.
Nat Genet
December 2024
Research Service, VA Northeast Ohio Healthcare System, Cleveland, OH, USA.
Article Synopsis
- * By analyzing data from the Million Veteran Program and other cohorts, the study identifies 63 genetic loci linked to AMD, including 30 that were previously unknown, highlighting significant differences in risk among various ancestries.
- * The findings reveal that certain genetic risk factors, like those found in the CFH locus, have varying effects based on ancestry, suggesting that targeted therapies could be developed by considering these genetic differences.
Homogeneity analysis of medicine tablets by laser induced breakdown spectroscopy combined with multivariate methods.
Eur J Pharm Biopharm
December 2024
Physical Medicine and Rehabilitation Department, Iran University of Medical Sciences, Tehran, Iran.
Pharmaceutical tablets need to have a homogenous chemical structure, especially in cases where the patient may divide the tablet in half prior to consumption. This work aims to demonstrate the viability of using laser induced breakdown spectroscopy (LIBS) for analyzing the homogeneity and determining the chemical composition of losartan potassium tablets. This was accomplished by obtaining the spectra of 10 tablet points in 30 successive laser pulses, which revealed four main peaks (C, H, N, and O) as well as a high concentration of calcium and potassium in the core tablets and titanium in the coating-all of which are excellent analytical objectives for LIBS.
View Article and Find Full Text PDFSystematical investigations on the influence of Stark splitting of Er on the potential wavelength-tunable of laser and optical amplification in several glasses.
Spectrochim Acta A Mol Biomol Spectrosc
February 2025
Rare Earth College, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; National Rare Earth Functional Material Innovation Center, Ganzhou, Jiangxi 341000, China; Key Laboratory of Rare Earths, Chinese Academy of Sciences, Ganzhou, Jiangxi Province 341119, China. Electronic address:
Er-doped glasses and fibers with broadband near infrared (NIR) emission have been widely applied in EDFA. Limited by optical gain band of Er-doped glasses and fibers, it was hardly meet to the demands of broadband amplification in the C + L band. In this work, six glass matrixes were employed for discussing the influence of glass matrix on the Stark splitting of Er and the wavelength of laser output and amplification.
View Article and Find Full Text PDFAnomalous Polarons in Two-Dimensional Organometallic Perovskite Ferroelectric.
Adv Sci (Weinh)
November 2024
Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China.
The concept of ferroelectric polarons is proposed to partially explain the exceptional optoelectronic properties observed in lead halide perovskites (LHPs). It is intriguing but unclear how this proposal, which involves local or transient polarizations, applies in general to 2D LHPs with long-range ferroelectricity. Here, this work presents a pioneering time-domain experimental investigation of polarons in ferroelectric (IA)(MA)PbBr (IMPB; IA is isoamylammonium and MA is methylammonium) using transient absorption spectroscopy.
View Article and Find Full Text PDFCompositional analysis of Swertia chirayita medicinal plant using laser-induced breakdown spectroscopy and ICP-MS.
PLoS One
September 2024
Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, Saudi Arabia.
One of the most significant medicinal plants used to treat numerous illnesses is Swertia chirayita. The present study demonstrated the compositional analysis of the Swertia chirayita (S. chirayita) plant using an emerging and non-destructive laser-induced breakdown spectroscopy (LIBS) technique.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!