Next Article in Journal
Orthogonal Operators: Applications, Origin and Outlook
Previous Article in Journal
Topological Characterization of the Crystallographic Structure of Titanium Difluoride and Copper (I) Oxide
Previous Article in Special Issue
Heavy Metals Detection in Zeolites Using the LIBS Method
Open AccessArticle

Tracking Temporal Development of Optical Thickness of Hydrogen Alpha Spectral Radiation in a Laser-Induced Plasma

1
Physics and Applied Physics Department, University of Massachusetts Lowell, Lowell, MA 01854, USA
2
Physics Department, University of Tennessee Space Institute, Tullahoma, TN 37388-9700, USA
*
Author to whom correspondence should be addressed.
Atoms 2019, 7(4), 101; https://doi.org/10.3390/atoms7040101
Received: 30 September 2019 / Revised: 23 October 2019 / Accepted: 23 October 2019 / Published: 4 November 2019
(This article belongs to the Special Issue Laser Plasma Spectroscopy Applications)
In this paper, we consider the temporal development of the optical density of the H α spectral line in a hydrogen laser-induced plasma. This is achieved by using the so-called duplication method in which the spectral line is re-imaged onto itself and the ratio of the spectral line with it duplication is taken to its measurement without the duplication. We asses the temporal development of the self-absorption of the H α line by tracking the decay of duplication ratio from its ideal value of 2. We show that when 20% loss is considered along the duplication optical path length, the ratio is 1.8 and decays to a value of 1.25 indicating an optically thin plasma grows in optical density to an optical depth of 1.16 by 400 ns in the plasma decay for plasma initiation conditions using Nd:YAG laser radiation at 120 mJ per pulse in a 1.11 × 10 5 Pa hydrogen/nitrogen gas mixture environment. We also go on to correct the H α line profiles for the self-absorption impact using two methods. We show that a method in which the optical depth is directly calculated from the duplication ratio is equivalent to standard methods of self-absorption correction when only relative corrections to spectral emissions are needed. View Full-Text
Keywords: atomic spectroscopy; radiation transfer; hydrogen; laser-induced breakdown spectroscopy; stark broadening atomic spectroscopy; radiation transfer; hydrogen; laser-induced breakdown spectroscopy; stark broadening
Show Figures

Figure 1

MDPI and ACS Style

Surmick, D.M.; Parigger, C.G. Tracking Temporal Development of Optical Thickness of Hydrogen Alpha Spectral Radiation in a Laser-Induced Plasma. Atoms 2019, 7, 101.

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.

Article Access Map by Country/Region

1
Back to TopTop