Ahmed, Z. E., R. M. Abdelazeem, M. Abdelhamid, Z. Abdel-Salam, and M. A. El-Harith, "Conventional versus AI-based spectral data processing and classification approaches to enhance LIBS's analytical performance", Analytical Methods, vol. 17, issue 13, pp. 2771-2782, 2025.
El-Saeid, R. H., M. Abdelhamid, M. F. Ali, and M. A. El-Harith, "LIBS utilization for the elemental analysis of black resin and gold used by ancient Egyptians in embalming", Journal of Cultural Heritage , vol. 67, pp. 101-110, 2024.
Khedr, A. A., A. A. Surour, A. El-Hussein, and M. Abdelhamid, Characterization and discrimination of some gem silicate minerals adopting LIBS, FTIR, and Raman spectroscopic techniques, , vol. 13, issue 8, pp. 085101, 2023/08/01. AbstractWebsite

In this paper, characterization and discrimination of some silicate gems (gemstones and low-gem quality varieties) from ancient Egyptian mines have been performed for the first time adopting molecular and elemental spectroscopic techniques. The selected gem groups are peridot, beryl/emerald, amazonite, and amethyst. In this sense, characterization of the genuine Egyptian gems and the importance of mineralogical and chemical signatures in a historical context as well as the scope of geoheritage can be achieved for the first time. Laser induced breakdown spectroscopy (LIBS) analysis has been found to be an effective method for the discrimination among different gems groups where a characterizing element for each group in a specific spectral window has been found. Raman and Fourier transform infrared (FTIR) spectroscopy spectra have proven to be fingerprints with the ability to distinguish future alteration of the gemstone depending on the molecular vibrational spectroscopy. FTIR provides the functional group that can absorb the infrared radiation and be responsible for the coloring of the gemstones.

Elhassan, A., M. A. El-Harith, and M. Abdelhamid, Effect of target thickness and laser irradiance on the back-reflection-enhanced laser-induced breakdown spectroscopy signal in glass, , vol. 13, issue 1, pp. 7218, 2023. AbstractWebsite

In the work that is being presented here, the effect of sample thickness and laser irradiance on the reduction of the signal-to-background ratio SBG and the plasma parameters, specifically electron temperature and electron density, is being investigated using back-reflection-enhanced laser-induced breakdown spectroscopy (BRELIBS). Copper and silver discs that had been highly polished were attached to the back surface of the glass target, and the Nd-YAG laser beam that was focused on the front surface of the target was tuned to its fundamental wavelength. The thicknesses of the transparent glass samples that were analysed were 1 mm, 3 mm, and 6 mm. One is able to achieve a range of different laser irradiance levels by adjusting the working distance that exists between the target sample and the focusing lens. The end result of this is that the signal-to-background ratio in the BRELIBS spectra of thicker glass samples is significantly lower as compared to the ratio in the spectra of thinner glass samples. In addition, a significant influence of modifying the laser irradiance (by increasing the working distance on the SBG ratio) is seen at various glass thicknesses for both BRELIBS and LIBS, with BRELIBS having a better SBG. Nevertheless, the laser-induced plasma parameter known as the electron temperature has not been significantly impacted by the decrease in the glass thickness.

Elhassan, A., M. Abdelhamid, M. Abdelkreem, and M. A. El-Harith, Using LIBS for monitoring and estimation of heavy elements in industrial wastewater during its remediation, , vol. 2620, issue 1, pp. 070001, 2023/03/24. AbstractWebsite

Industrial wastewater contains heavy metals such as (Pb, Zn, Ni, Cd, Cr, and Co) that cause a significant danger to the whole ecosystem, including human health. In dealing with such a problem, it is necessary to control the pollution at the source and achieve real-time and online monitoring. In the present study laser-induced breakdown spectroscopy (LIBS) technique has been used as a diagnostic tool for estimating heavy elements concentration in the wastewater before and after treatment. For this purpose, bentonite clay has been used as an efficient absorber to remove heavy metals from wastewater. Therefore, the adsorption efficiency of bentonite clay for the existing heavy metals was studied experimentally in detail. In addition, influencing parameters such as pollutants concentration and adsorbent dose have been investigated. Synthetic wastewater has been used to construct calibration curves for each heavy element under investigation. Calibration curves for different elements were used to quantitatively analyze the heavy elements in industrial wastewater before and after treatment with bentonite clay. The results obtained via LIBS analysis have been validated by examining some samples via ICP-MS. Good agreement has been obtained between the results of both techniques, revealing the potential of using Bentonite clay efficiently in heavy elements remediation of the industrial wastewater. On the other hand, adopting LIBS in estimating and monitoring such pollutants has proved its feasibility in environmental applications.

Abdelhamid, M., D. Korte, H. Cabrera, O. Pliekhova, Z. Ebrahimpour, L. U. Štangar, and M. Franko, "Thermo-Optical Characterization of Cu- and Zr-Modified TiO2 Photocatalysts by Beam Deflection Spectrometry", Applied Sciences , vol. 11, issue 22, pp. 10937, 2021.
Ahmed, Z. E., M. Abdelhamid, Z. A. Abdel-Salam, V. Palleschi, and M. A. El-Harith, "Laser-induced breakdown spectroscopy and chemometric analysis of black toners for forensic applications, Journal of Chemometrics", Journal of Chemometrics , pp. 1-13, 2021.
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