Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/115
Title: The anomalous sodium doublet D<inf>2</inf>/D<inf>1</inf> spectral line intensity ratio - A manifestation of CCD's presaturation effect
Authors: Kasalica, Bećko 
Stojadinović, Stevan 
Belča, Ivan 
Sarvan, Mirjana 
Zeković, Ljubiša
Radić-Perić, Jelena
Issue Date: 1-Jan-2013
Journal: Journal of Analytical Atomic Spectrometry
Abstract: 
In this paper we present the results of intensity measurements of D 1 (589.5224 nm) and D2 (588.9950 nm) sodium doublet spectral lines emitted from a short-lifetime plasma randomly appearing across the aluminum anode surface during its electrolytic oxidation from the water solution of boric acid with sodium tetraborate. We found that the D2 to D1 intensity ratios were not constant, varying from 2 to 1.2. Assuming that the plasma is in local thermal equilibrium it is expected that the intensity ratio of sodium doublet components equals the ratio of the statistical weights of the atomic sublevels corresponding to the electronic transitions (D1: 32P1/2-32S 1/2, D2: 32P3/2-32S 1/2) i.e. 2. After detailed analyses of a series of spectra obtained by applying different detection parameters, like exposure time, slit width, detection mode, and number of accumulations, we attributed the anomalous D 2/D1 intensity ratio to the effect of approaching a saturation condition of the charge coupled device detector and thus to an early indication of saturation occurrence. © 2013 The Royal Society of Chemistry.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/115
ISSN: 0267-9477
DOI: 10.1039/c2ja30239j
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