Laser-Induced Breakdown Spectroscopy for Determination of Spectral Fundamental Parameters

Abstract

In this review, we report and critically discuss the application of LIBS for the determination of plasma-emission fundamental parameters, such as transition probabilities, oscillator strengths, Stark broadening and shifts, of the emission lines in the spectrum. The knowledge of these parameters is of paramount importance for plasma diagnostics or for quantitative analysis using calibration-free LIBS methods. In the first part, the theoretical basis of the analysis is laid down; in the second part, the main experimental and analytical approaches for the determination by LIBS of the spectral line spectroscopic parameters are presented. In the conclusion, the future perspectives of this kind of analysis are discussed.

Evaluation of electrolyte element composition in human tissue by laser-induced breakdown spectroscopy (LIBS)

“…This curved calibration curve is attributed to the Stark effect, which suppresses the peak intensities at higher concentrations and simultaneously leads to peak broadening. In very simplified terms, no emitted photons are lost due to the Stark effect, since the emitted photons merely shift their wavelengths and are all detected in the end 15 , 38 . As the presented approach shows, only the peak area can serve as a good approximation to compensate for the intensity loss.…”

“…Under the same conditions, atoms with low abundance show low intensities with narrow peak widths. This form of self-broadening, also known as the Stark effect, leads to peak splitting and nonlinear calibration curves 15 . Since the LIBS emission peaks follow a Lorentzian distribution, different peak shapes result, depending on the signal intensity.…”

Laser Induced Breakdown Spectroscopy of Er II for Transition Probability Measurements

“…For the determination of transition probabilities, it is important to realize a thin plasma condition [21] as well as the LTE condition. If the plasma is so thick that it can absorb the emission occurring within the plasma (self-absorption effect), the observed intensity does not reflect the transition probability.…”

“…LIBS has been mainly developed for element analysis in industrial manufacturing [16], environmental monitoring [17,18], geological studies [19] including planetary exploration [20], and many other applications. On the other hand, LIBS is one of the most powerful methods for the determination of fundamental atomic properties, such as transition probabilities (see the review paper [21] in this Special Issue and references therein). In order to determine transition probabilities properly, a local thermal equilibrium (LTE) condition should be realized.…”

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…Measurement of the effect of self-absorption on the measured line intensities and line broadening in LIBS spectra can be used to determine fundamental parameters, such as transition probabilities, oscillator strengths and Stark broadening coefficients. In a recent review, Aberkane et al 107 critically discussed the application of LIBS for the determination of these fundamental parameters, which are of paramount importance for plasma diagnostics or for quantitative analysis using a calibration-free LIBS methods. The mechanism of the multi-elemental self-absorption effect in LIBS was also studied in detail by Cai et al , 108 who combined different models to create a self-absorption effect value model.…”