Laser-induced breakdown spectroscopy

From 2000 to 2010, the U.S. Army Research Laboratory (ARL) researched potential extensions to LIBS technology, which focused on hazardous material detection.[4][5] Applications investigated at ARL included the standoff detection of explosive residues and other hazardous materials, plastic landmine discrimination, and material characterization of various metal alloys and polymers. Results presented by ARL suggest that LIBS may be able to discriminate between energetic and non-energetic materials.[6]

LIBS is one of several analytical techniques that can be deployed in the field as opposed to pure laboratory techniques e.g. spark OES. As of 2015, recent research on LIBS focuses on compact and (man-)portable systems. Some industrial applications of LIBS include the detection of material mix-ups,[8] analysis of inclusions in steel, analysis of slags in secondary metallurgy,[9] analysis of combustion processes,[10] and high-speed identification of scrap pieces for material-specific recycling tasks. Armed with data analysis techniques, this technique is being extended to pharmaceutical samples.[11][12]

For an optically thin plasma composed of a single, neutral atomic species in local thermal equilibrium (LTE), the density of photons emitted by a transition from level i to level j is[17]

${\displaystyle I_{ij}(\lambda )={\frac {1}{4\pi }}n_{0}A_{ij}{\frac {g_{i}\exp ^{-E_{i}/k_{B}T}}{U(T)}}I(\lambda )}$

where :

• ${\displaystyle I_{ij}}$ is the emission rate density of photons (in m⁻³ sr⁻¹ s⁻¹)
• ${\displaystyle n_{0}}$ is the number of neutral atoms in the plasma (in m⁻³)
• ${\displaystyle A_{ij}}$ is the transition probability between level i and level j (in s⁻¹)
• ${\displaystyle g_{i}}$ is the degeneracy of the upper level i (2J+1)
• ${\displaystyle U(T)}$ is the partition function (in s⁻¹)
• ${\displaystyle E_{i}}$ is the energy level of the upper level i (in eV)
• ${\displaystyle k_{B}}$ is the Boltzmann constant (in eV/K)
• ${\displaystyle T}$ is the temperature (in K)
• ${\displaystyle I(\lambda )}$ is the line profile such that ${\displaystyle \int _{-\infty }^{\infty }I(\lambda )d\lambda =1}$
• ${\displaystyle \lambda }$ is the wavelength (in nm)

The partition function ${\displaystyle U(T)}$ is the statistical occupation fraction of every level ${\displaystyle k}$ of the atomic species :

${\displaystyle U(T)=\sum _{j}g_{j}\exp ^{-E_{j}/k_{B}T}}$

Recently, LIBS has been investigated as a fast, micro-destructive food analysis tool. It is considered a potential analytical tool for qualitative and quantitative chemical analysis, making it suitable as a PAT (Process Analytical Technology) or portable tool. Milk, bakery products, tea, vegetable oils, water, cereals, flour, potatoes, palm date and different types of meat have been analyzed using LIBS.[18] Few studies have shown its potential as an adulteration detection tool for certain foods.[19][20] LIBS has also been evaluated as a promising elemental imaging technique in meat.[21]

In 2019, researchers of the University of York and of the Liverpool John Moores University employed LIBS for studying 12 European oysters (Ostrea edulis, Linnaeus, 1758) from the Late Mesolithic shell midden at Conors Island (Republic of Ireland). The results highlighted the applicability of LIBS to determine prehistoric seasonality practices as well as biological age and growth at an improved rate and reduced cost than was previously achievable.[22][23]

• Spectroscopy
• Atomic spectroscopy
• Raman spectroscopy
• Laser-induced fluorescence
• List of plasma (physics) articles
• List of surface analysis methods
• Laser ablation
• Photoacoustic spectroscopy

• Lee, Won-Bae; Wu, Jianyong; Lee, Yong-Ill; Sneddon, Joseph (2004). "Recent Applications of Laser-Induced Breakdown Spectrometry: A Review of Material Approaches". Applied Spectroscopy Reviews. 39 (1): 27–97. Bibcode:2004ApSRv..39...27L. doi:10.1081/ASR-120028868. ISSN 0570-4928. S2CID 98545359.
• Noll, Reinhard; Bette, Holger; Brysch, Adriane; Kraushaar, Marc; Mönch, Ingo; Peter, Laszlo; Sturm, Volker (2001). "Laser-induced breakdown spectrometry — applications for production control and quality assurance in the steel industry". Spectrochimica Acta Part B: Atomic Spectroscopy. 56 (6): 637–649. Bibcode:2001AcSpe..56..637N. doi:10.1016/S0584-8547(01)00214-2. ISSN 0584-8547.

• Andrzej W. Miziolek; Vincenzo Palleschi; Israel Schechter (2006). Laser Induced Breakdown Spectroscopy. New York: Cambridge University Press. ISBN 0-521-85274-9.
• Gornushkin, I.B.; Amponsah-Manager, K.; Smith, B.W.; Omenetto, N.; Winefordner, J.D. (2004). "Microchip Laser Induced Breakdown Spectroscopy: Preliminary Feasibility Investigation". Applied Spectroscopy. 58 (7): 762–769. Bibcode:2004ApSpe..58..762G. doi:10.1366/0003702041389427. PMID 15282039. S2CID 41416641. Archived from the original on 2013-04-15.
• Amponsah-Manager, K.; Omenetto, N.; Smith, B. W.; Gornushkin, I. B.; Winefordner, J. D. (2005). "Microchip laser ablation of metals: Investigation of the ablation process in view of its application to laser-induced breakdown spectroscopy". Journal of Analytical Atomic Spectrometry. 20 (6): 544. doi:10.1039/B419109A.
• Lopez-Moreno, C.; Amponsah-Manager, K.; Smith, B. W.; Gornushkin, I. B.; Omenetto, N.; Palanco, S.; Laserna, J. J.; Winefordner, J. D. (2005). "Quantitative analysis of low-alloy steel by microchip laser induced breakdown spectroscopy". Journal of Analytical Atomic Spectrometry. 20 (6): 552. doi:10.1039/B419173K. S2CID 39938942.
• Bette, H; Noll, R (2004). "High speed laser-induced breakdown spectrometry for scanning microanalysis". Journal of Physics D: Applied Physics. 37 (8): 1281. Bibcode:2004JPhD...37.1281B. doi:10.1088/0022-3727/37/8/018. S2CID 250750854.
• Balzer, Herbert; Hoehne, Manuela; Noll, Reinhard; Sturm, Volker (2006). "New approach to online monitoring of the Al depth profile of the hot-dip galvanised sheet steel using LIBS". Analytical and Bioanalytical Chemistry. 385 (2): 225–33. doi:10.1007/s00216-006-0347-z. PMID 16570144. S2CID 42607960.
• Sturm, V.; Peter, L.; Noll, R. (2000). "Steel analysis with laser-induced breakdown spectrometry in the vacuum ultraviolet". Applied Spectroscopy. 54 (9): 1275–1278. Bibcode:2000ApSpe..54.1275S. doi:10.1366/0003702001951183. S2CID 32765892.
• Vadillo, José M.; Laserna, J.Javier (2004). "Laser-induced plasma spectrometry: Truly a surface analytical tool". Spectrochimica Acta Part B: Atomic Spectroscopy. 59 (2): 147. Bibcode:2004AcSpe..59..147V. doi:10.1016/j.sab.2003.11.006.
• Doucet, François R.; Faustino, Patrick J.; Sabsabi, Mohamad; Lyon, Robbe C. (2008). "Quantitative molecular analysis with molecular bands emission using laser-induced breakdown spectroscopy and chemometrics". Journal of Analytical Atomic Spectrometry. 23 (5): 694. doi:10.1039/b714219f. S2CID 97020157.
• В.Копачевский, В.Шпектор, Д.Клемято, В.Бойков, М.Кривошеева, Л.Боброва. (2008). "Количественный анализ состава тарных стекол анализатором LEA S500". Фотоника (in Russian) (1): 38–40.{{cite journal}}: CS1 maint: multiple names: authors list (link)
• Noll, Reinhard (2012). Laser-Induced Breakdown Spectroscopy: Fundamentals and Applications. Berlin: Springer. ISBN 978-3-642-20667-2.

• NIST LIBS Database