Curves of growth of spectral lines emitted by a laser-induced plasma: influence of the temporal evolution and spatial inhomogeneity of the plasma

Aguilera, J.A.; Bengoechea, J.; Aragón, C.

doi:10.1016/s0584-8547(02)00258-6

Cited by 104 publications

(80 citation statements)

References 25 publications

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“…The details of equation derivation are fully explained in Refs. [64,68]. According to the COG theory, at low species densities, the spectral intensity (W m −2 sr −1 ) can be approximated by a linear function as below [64]:…”

Section: Analysis By Curve Of Growth Methodsmentioning

confidence: 99%

“…Therefore, self-absorption must be completely corrected for exact quantitative analysis. Different groups corrected this effect by several experimental and theoretical methods [60,61] of duplicating mirror [62], line ratio [63], curve of growth [64][65][66][67][68], calibration free [69,70] and fitting algorithms [71,72] for performing the accurate analysis. For instance, Cristoforetti et al [63,73] estimated the self-absorption coefficient by considering the ratio of different parameters such as spectral peak intensity, line width, as well as integrated intensity of a specific spectral line in the case of experimental condition (with self-absorption) to the case of thin plasma (without self-absorption).…”

Section: Introductionmentioning

confidence: 99%

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Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Rezaei

Tavassoli

2015

Appl. Phys. B

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radioactive, high temperature, toxic materials) [19][20][21][22][23][24][25], industry [26][27][28][29][30][31], architecture, medical (noninvasive study of human teeth and hair, diagnosis of cancer tissue, DNA analysis) [32][33][34][35][36][37], military and civil security (detection of explosive material and biological weapons) [38][39][40][41][42][43]. Most of these applications are investigated under the condition of earth's atmosphere (i.e., at 760 Torr in air atmosphere) in order to determine the selected material compositions. Nevertheless, interest in LIBS in other ambient gases with various circumstances has been grown because of its practical application. It should be mentioned that nowadays wide applications of gas effects in space exploration (such as utilizing LIBS for investigating specific conditions on Venus and Mars) [4,44,45] are studied. For instance, in scope of gas pressure, the high-pressure environment serves to replicate the conditions of a nuclear reactor or simulate some planet environments [46]. At the opposite, reduced gas pressures or vacuum is applied for determination of isotope ratios [47][48][49], synthesis of nanoparticles and thin films.Different research groups [50][51][52][53][54][55] have investigated the quantitative analysis of plasma parameters and spectral line properties in LIBS technique by considering the influences of gas conditions. For instance, Effenberger et al. [56] have properly presented a review of applications of different gas effects in LIBS experiment. They have comprehensively mentioned the results of various groups about the effects of atmosphere compositions and gas pressures (higher and lower than 760 Torr) on plasma parameters and spectral line characteristics. Dawood et al. [57] have investigated the effects of gas nature and its pressure on temporal distribution of aluminum plasma. They have explained that both plasma temperature and electron density grow with ambient gas pressure. In addition, they have shown that argon provides the highest temperature and plasma density, helium provides the lowest one, and nitrogen produces Abstract In this paper, the influences of He ambient gas on aluminum emissions are investigated by experimental analysis of LIBS spectrum. Plasma is produced by focusing of a Nd:YAG laser pulse at a wavelength of 1064 nm on Al standard samples. In this work, the effects of helium atmosphere at different pressures on the amount of spectral self-absorption are studied. The results are discussed by utilizing two approaches: the curve of growth and calibration curve. It is seen that by increasing the gas pressure, the self-absorption enhances. Also, a new method of applying one standard sample instead of other traditional techniques is introduced for concentration prediction. The presented method would be helpful for the situation in which supplying standard samples is not very easy. Then, the accuracy of this new method can be checked by comparison of concentration prediction of the standard samples with their real concentrations.

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Section: Analysis By Curve Of Growth Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Rezaei

Tavassoli

2015

Appl. Phys. B

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“…The observed increase in the linewidths with increasing laser pulse duration can be associated with an increase in the number of collisions between the species [9][10][11][12][13][14] . This would mean that plasmas generated by longer pulses have a higher level of electron density, which can be explained assuming that there is an interaction between the incident radiation and the generated plasma.…”

Section: Spectral Identification and Linewidths Of Cu Emission As A Fmentioning

confidence: 99%

Time resolving imaging spectroscopy applied to the analysis of plasmas generated by pulsed lasers

Alvira

Ponce

Arronte

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. Start your abstract here… Time resolved imaging spectroscopy were used to study the spatial and temporal evolution of LIBS (Laser Induced Breakdown Spectroscopy) plasmas generated in Cu substrates by laser pulses of different duration. Long laser pulses (microsecond) and short laser pulses (nanosecond) as well as multipulse emission were used for excitation. Analysis was made by using an imaging spectrometer with time resolved detection. Results show that the use of long laser excitation pulses produce emission spectra with the same signal to noise ratio, but with lower resolution than those produced with shorter ones. The different species generated in LIBS experiments as neutral or single ionized have a different spatial distribution inside the plasma. We demonstrated that using spatial discrimination procedures is possible to obtain spectra with the same signal to noise ratio than those obtained with a gating detector. In this case an appreciable advantage in cost reduction is obtained by replacing the gating detector by a cheap screen.

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“…influencing the LIBS spectrum, and in particular self absorption effects [22][23][24][25][26][27][28] and matrix effects [29][30][31]. In this work, the self absorption effects on pure manganese will be studied, and the theoretical basis o f the spectral analysis will be laid.…”

mentioning

confidence: 99%

Evaluation of self-absorption of manganese emission lines in Laser Induced Breakdown Spectroscopy measurements

Bredice

Borges

Sobral

et al. 2006

Spectrochimica Acta Part B: Atomic Spectroscopy

128

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Curves of growth of spectral lines emitted by a laser-induced plasma: influence of the temporal evolution and spatial inhomogeneity of the plasma

Cited by 104 publications

References 25 publications

Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Quantitative analysis of aluminum samples in He ambient gas at different pressures in a thick LIBS plasma

Time resolving imaging spectroscopy applied to the analysis of plasmas generated by pulsed lasers

Evaluation of self-absorption of manganese emission lines in Laser Induced Breakdown Spectroscopy measurements

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