Optical Spectroscopic and Plasma Diagnostics of Moringa oleifera Using Laser-Induced Breakdown Spectroscopy

Noora Hamid  Mahmood; Alyaa  Hussein  Ali

doi:10.30526/39.4.4473

Authors

Noora Hamid Mahmood Department of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq https://orcid.org/0009-0005-7393-4765
Alyaa Hussein Ali Department of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq https://orcid.org/0000-0001-6960-023X

DOI:

https://doi.org/10.30526/39.4.4473

Keywords:

Moringa oleifera, Optical Emission Spectroscopy, Lorentzian fitting and Stark broadening

Abstract

The spectroscopic and plasma characteristics of Moringa oleifera were examined by laser-induced breakdown spectroscopy (LIBS) and optical emission spectroscopy (OES) at laser energies between 50 and 450 mJ. On compressed Moringa oleifera powder discs, laser-induced plasma was produced and was analyzed to determine elemental composition as well as plasma parameters. There were distinct emission lines of K, Ca, Na, and O at higher intensities with laser power. Based on Boltzmann plot analysis, we observed a change from a value of 1.298 electron temperature (Te) to 1.352 eV which was an increase in electron temperature (Te) and reflected the improved efficiency of excitation as well as plasma stability. The majority of the analysis was validated through Lorentzian fitting and Stark broadening thus, thus, allowing for quantitative evaluation electron density. The findings validate local thermal equilibrium condition and exhibit the suitability of LIBS/ OES to plant-based material characterization and green nanotechnology usage

Author Biographies

Noora Hamid Mahmood , Department of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq

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Alyaa Hussein Ali, Department of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq

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References

1. Zhang Y, Zhang T, Li H. Application of laser-induced breakdown spectroscopy (LIBS) in environmental monitoring. Spectrochim Acta B At Spectrosc. 2021;181:106218. https://doi.org/10.1016/j.sab.2021.106218

2. Santos D Jr, Nunes LC, de Carvalho GGA, Gomes MS, de Souza PF, Leme FO. Laser-induced breakdown spectroscopy for analysis of plant materials: a review. Spectrochim Acta B At Spectrosc. 2012;71-72:3-13. https://doi.org/10.1016/j.sab.2012.05.005

3. Babos DV, Guedes WN, Freitas VS, Silva FP. Laser-induced breakdown spectroscopy as an analytical tool for total carbon quantification in tropical and subtropical soils: evaluation of calibration algorithms. Front Soil Sci. 2024;3:1242647. https://doi.org/10.3389/fsoil.2023.1242647

4. Rashid M, Anwar HA, Aslam MS, Rashid A. Laser-induced breakdown spectroscopy for soil analysis: recent advances in nutrient and contaminant detection. Spectrum Eng Sci. 2025;3(4):279-87. https://doi.org/10.5281/zenodo.16784303

5. Mohammed SR, Aadim KA, Ali AH, Abdalameer NK. Study zeolite plasma parameters ablated by a 1064 nm Q-switched laser Nd:YAG. AIP Conf Proc. 2023;2475(1). https://doi.org/10.1063/5.0111674

6. Giannakaris N, Gürtler G, Stehrer T, Mair M, Pedarnig JD. Optical emission spectroscopy of an industrial thermal atmospheric pressure plasma jet: parametric study of electron temperature. Spectrochim Acta B At Spectrosc. 2023;207:106736. https://doi.org/10.1016/j.sab.2023.106736

7. Zaplotnik R, Primc G, Vesel A. Optical emission spectroscopy as a diagnostic tool for characterization of atmospheric plasma jets. Appl Sci (Basel). 2021;11(5):2275. https://doi.org/10.3390/app11052275

8. Singh J, Dutta T, Kim KH, Rawat M, Samddar P, Kumar P. 'Green' synthesis of metals and their oxide nanoparticles: applications for environmental remediation. J Nanobiotechnology. 2018;16(1):84. https://doi.org/10.1186/s12951-018-0408-4

9. Ali HJ, Ahmed BM, Khalaf MK, Albeer A. Plasma diagnostics of argon-oxygen gases mixture using different applied power in a DC sputtering system. Al-Mustansiriyah J Sci. 2023;34(4):110-5. https://doi.org/10.23851/mjs.v34i4.1361

10. Geethika BR, Thomas J, Kumar RR, Dave J, Joshi HC. Effect of polarization on spectroscopic characterization of laser produced aluminium plasma. Spectrochim Acta B At Spectrosc. 2024;221:107033. https://doi.org/10.1016/j.sab.2024.107033

11. Hahn DW, Omenetto N. Laser-induced breakdown spectroscopy (LIBS), Part II: review of instrumental and methodological approaches to material analysis and applications to different fields. Appl Spectrosc. 2012;66(4):347-419. https://doi.org/10.1366/11-06574

12. Gaudiuso R, Melikechi N, Abdel-Salam ZA, Harith MA, Palleschi V, Motto-Ros V, Busser B. Laser-induced breakdown spectroscopy for human and animal health: a review. Spectrochim Acta B At Spectrosc. 2019;152:123-48. https://doi.org/10.1016/j.sab.2018.11.006

13. Djurovic S, Blagojevic B, Konjevic N. Experimental and semiclassical Stark widths and shifts for spectral lines of neutral and ionized atoms: a critical review of experimental and semiclassical data for the period 2008 through 2020. J Phys Chem Ref Data. 2023;52(3):031503. https://doi.org/10.1063/5.0156071

14. Majeed FN, Naeemah MR, Ali AH, Mazhir SN. Spectroscopic analysis of clove plasma parameters using optical emission spectroscopy. Iraqi J Sci. 2021;62(8):2565-70. https://doi.org/10.24996/ijs.2021.62.8.9

15. Ghany C, Lee KM, Sanghapi HK, Singh VK. Diagnostics of laser-induced plasma. In: Singh VK, Tripathi DK, Deguchi Y, Wang Z, editors. Laser induced breakdown spectroscopy (LIBS). Hoboken (NJ): John Wiley & Sons; 2023. 55-94. https://doi.org/10.1002/9781119758396.ch3

16. Alrashid SNT, Mazhir SN, Hamid NM. Spectroscopic investigation of plasma parameters in a CdO target using laser-induced breakdown spectroscopy. J Phys Sci. 2025;36(3):75-87. https://doi.org/10.21315/jps2025.36.3.6

17. Mazhir SN, Taha SK, Harb NH, Khalaf MK. Optical diagnostics of laser-induced plasma. IOP Conf Ser Mater Sci Eng. 2020;871:012081. https://doi.org/10.1088/1757-899X/871/1/012081

18. Tawfeeq HU, Abbas KA, Aadim AK. Laser-induced plasma characterization. J Phys Conf Ser. 2021;2114:012049. https://doi.org/10.1088/1742-6596/2114/1/012049

19. Men B, Li C, He Q, Liu S, Li L. Spatio-temporal evolution of laser ablation W plasma under low-pressure Ar gas and Ar plasma ambients. J Anal At Spectrom. 2025;40:762-74. https://doi.org/10.1039/D4JA00326H

20. Wang YF, Zhu XM. Development of optical emission spectroscopy method with neural network model: case study of determining the electron density in a xenon microwave discharge. J Appl Phys. 2024;136(24):243302. https://doi.org/10.1063/5.0243484

21. Mishra H, Tichý M, Kudrna P. Optical emission spectroscopy study of plasma parameters in low-pressure hollow cathode plasma jet and planar magnetron powered by DC and pulsed DC supply. Vacuum. 2022;205:111413. https://doi.org/10.1016/j.vacuum.2022.111413

22. Smijesh N, Philip R. Optical diagnostics of laser-induced plasma: emission features and plasma parameters. J Anal At Spectrom. 2021;36(4):712-28. https://doi.org/10.1039/D0JA00492B

23. Rachdi L, Sushkov V, Hofmann M. Spectroscopic investigation of laser-induced plasma. Spectrochim Acta B At Spectrosc. 2022;194:106432. https://doi.org/10.1016/j.sab.2022.106432

24. Aguilera JA, Aragón C. New procedure for LIBS addressing plasma inhomogeneity. Spectrochim Acta B At Spectrosc. 2024;221:106969. https://doi.org/10.1016/j.sab.2024.106969

25. Gehlot S, Singh JP, Thareja RK. Spectroscopic diagnostics of laser-induced plasma: recent developments and applications. Spectrochim Acta B At Spectrosc. 2025;225:107142. https://doi.org/10.1016/j.sab.2024.107142

26. Manelski HT, Wiens RC, Bousquet B, Hansen PB, Schröder S, Clegg S, Martin ND, Nelson AE, Martinez RK, Ollila AM, Cousin A. LIBS plasma diagnostics with SuperCam on Mars: implications for quantification of elemental abundances. Spectrochim Acta B At Spectrosc. 2024;222:107061. https://doi.org/10.1016/j.sab.2024.107061

27. Andrews HB, Kitzhaber ZB, McFarlane J. Real time monitoring of noble gases using LIBS: impact on plasma properties and sensitivity. Spectrochim Acta B At Spectrosc. 2025;232:107237. https://doi.org/10.1016/j.sab.2025.107237

28. Gonçalves B. Plasma diagnostics: advances and interdisciplinary applications. Sensors (Basel). 2024;24(10):3257. https://doi.org/10.3390/s24103257

29. Faheem M, Jamil Y, Anwar H, Yasir J, Muhammad Z. A comprehensive laser-induced plasma diagnostics of hafnium using fundamental and second harmonics of pulsed Nd:YAG laser. Talanta. 2026;297:128701. https://doi.org/10.1016/j.talanta.2025.128701

30. Oliver TA, Michoski C, Langendorf S, LaJoie A. Automated Bayesian high-throughput estimation of plasma temperature and density from emission spectroscopy. Rev Sci Instrum. 2024;95(7):073520. https://doi.org/10.1063/5.0192810