A study of using femtosecond LIBS in analyzing metallic thin film–semiconductor interface

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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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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“…Depth profiling allowed differentiation between the dirty layer, the glaze surface, and the ceramic body. Galmed et al [38] studied Ti thin film using femtosecond LIBS. Titanium of thickness 213 nm was deposited onto a silicon substrate before and after thermal annealing.…”

Section: Depth Profiling Libs Is a Relatively Novel Techniquementioning

confidence: 99%

Laser-Induced Breakdown Spectroscopy in Africa

Kasem

Harith

2015

Journal of Chemistry

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Laser-induced breakdown spectroscopy (LIBS), known also as laser-induced plasma spectroscopy (LIPS), is a well-known spectrochemical elemental analysis technique. The field of LIBS has been rapidly matured as a consequence of growing interest in real-time analysis across a broad spectrum of applied sciences and recent development of commercial LIBS analytical systems. In this brief review, we introduce the contributions of the research groups in the African continent in the field of the fundamentals and applications of LIBS. As it will be shown, the fast development of LIBS in Africa during the last decade was mainly due to the broad environmental, industrial, archaeological, and biomedical applications of this technique.

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“…It has many practical advantages over more conventional elemental analysis techniques. LIBS has been utilized to analyze thin metal films [102] , and it has found more and more applications in monitoring of industrial processes [98] , characterization of jewellery products [103] , soil studies [104] , pulsed laser thin film deposition [105] , quality control of pharmaceutical products [100] , cleaning [106] , and in situ planetary exploration [107] .…”

Section: Laser-induced Breakdown Spectroscopy (Libs)mentioning

confidence: 99%

Advances in atomic physics

El-Sherbini

2015

Journal of Advanced Research

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Graphical abstractIn this review article, important developments in the field of atomic physics are highlighted and linked to research works the author was involved in himself as a leader of the Cairo University – Atomic Physics Group. Starting from the late 1960s – when the author first engaged in research - an overview is provided of the milestones in the fascinating landscape of atomic physics.

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A study of using femtosecond LIBS in analyzing metallic thin film–semiconductor interface

Cited by 21 publications

References 20 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

Laser-Induced Breakdown Spectroscopy in Africa

Advances in atomic physics

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