Next Article in Journal
On the Time Scales of Optical Variability of AGN and the Shape of Their Optical Emission Line Profiles
Previous Article in Journal
Developing the Techniques for Solving the Inverse Problem in Photoacoustics
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessArticle

Diagnostic of Langmuir Solitons in Plasmas Using Hydrogenic Spectral Lines

Physics Department, 206 Allison Lab, Auburn University, Auburn, AL 36849, USA
Atoms 2019, 7(1), 25;
Received: 15 January 2019 / Revised: 3 February 2019 / Accepted: 5 February 2019 / Published: 13 February 2019
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
PDF [1221 KB, uploaded 13 February 2019]


The development of various spectroscopic diagnostics of relatively weak Langmuir waves in plasmas and their successful implementation have a history of over 50 years. As for spectroscopic diagnostics of Langmuir solitons (i.e., relatively strong Langmuir waves) in plasmas, there have only been very few theoretical papers. The most promising result so far was based on using satellites of the dipole-forbidden spectral lines of He, Li, or He-like and Li-like ions. It was shown that, in the case of Langmuir solitons, the peak intensity of the satellites of the dipole-forbidden lines can be significantly enhanced—by orders of magnitude—compared to the case of non-solitonic Langmuir waves. This distinctive feature of satellites under Langmuir solitons allows them to be distinguished from non-solitonic Langmuir waves. In the present paper, we perform a general study of the effects of Langmuir solitons on arbitrary spectral lines of hydrogen or hydrogen-like ions. Then, using the Ly-beta line as an example, we compare the main features of the profiles for the case of the Langmuir solitons with the case of the non-solitonic Langmuir waves of the same amplitude. We also show how the line profiles depend on the amplitude of the Langmuir solitons and on their separation from each other within the sequence of the solitons. View Full-Text
Keywords: spectroscopic diagnostic; Langmuir solitons; hydrogenic spectral lines spectroscopic diagnostic; Langmuir solitons; hydrogenic spectral lines

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Oks, E. Diagnostic of Langmuir Solitons in Plasmas Using Hydrogenic Spectral Lines. Atoms 2019, 7, 25.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Atoms EISSN 2218-2004 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top