Open AccessELECTRON DENSITY SPECTROSCOPIC MEASUREMENT IN AL LASER INDUCED PLASMA
Author(s) -
Mohammed R. Abdulameer,
Ali A-K. Hussain,
Kadhim A. Aadim
Publication year - 2020
Publication title -
minar international journal of applied sciences and technology
Language(s) - English
Resource type - Journals
ISSN - 2717-8234
DOI - 10.47832/2717-8234.4-2.4
Subject(s) - plasma , electron density , atomic physics , electron temperature , laser , stark effect , spectroscopy , emission spectrum , plasma diagnostics , materials science , laser induced breakdown spectroscopy , spectral line , chemistry , analytical chemistry (journal) , optics , physics , chromatography , quantum mechanics , astronomy
Plasma generated by a 1064 nm pulsed Nd: YAG laser with pulse duration of 10 ns concentrated onto an Al solid target under vacuum pressure was examined spectroscopically. The temperature and electron density specifying the plasma were measured by time-resolved spectroscopy of neutral atom and ion line emissions in the time period range of 300–2000 ns. An echelle spectrograph is utilized to appear the plasma emission lines. The temperature was obtained using the spectral line comparison method and the electron density was calculated using the Stark Broadening (SB) method. The electron density was characterized as a function of laser pulse energy. The time range where the plasma is optically thin and is also in local thermodynamic equilibrium (LTE), significant for the laser-produced plasma (LPP) which was evaluated from the temporal profile of the intensity ratio of two Al I lines (λ1=380.581nm, 398.014nm, and 393.1996nm), (λ2= 586.781nm). It is found to be 700–1000 ns.