CMUXE People

Prasoon Prasoon Diwakar
Postdoctoral Research Associate

Phone: 765-494-6984 (o); Fax: 765-496-2233
E mail :
304A Potter Bldg, 500 Central Drive, West Lafayette, Indiana 47907


Dr. Diwakar has extensive background in Laser-Induced Breakdown Spectroscopy, Laser-Ablation Inductively-Coupled-Plasma Spectrometry (LA-ICP-MS), Spark-Induced Breakdown Spectroscopy (SIBS) and plasma spectroscopy. Before joining Purdue, he was a post-doctoral associate at NIOSH, Cincinnati.


Ph.D. Mechanical Engineering (University of Florida, Gainesville)
M.S. Mechanical Engineering (University of Florida, Gainesville)
B.Tech. Mechanical Engineering (Indian Institute of Technology, Kanpur)

Research and academic interests

Laser-based Diagnostics, Plasma-particle interactions, Plasma Diagnostics, Plasma Spectroscopy, Aerosol Analysis and Instrumentation, Thermal Sciences, Combustion Diagnostics

Professional Service distinctions and awards

National Academy of Sciences Postdoctoral Fellow
Elsevier/Spectrochimica Acta Atomic Spectroscopy Award Nominee (2007 and 2008)
Charles C Shepard Science Award Nominee for Outstanding Scientific Publication (2011)
IIT Kanpur Merit award
Member of OSA, SAS, American Association for Aerosol Research, NA-LIBS


  1. Freeman, J.R., Diwakar P.K, Harilal S.S., and Hassanein A. (2014)
    Improvements in discrimination of bulk and trace elements in long-wavelength double pulse LIBS
    Spectrochimica Acta B, Published online link

  2. LaHaye N.L., Harilal S.S., Diwakar P.K., and Hassanein A. (2014)
    Characterization of laser ablation sample introduction plasma plumes in fs-LA-ICP-MS
    Journal of Analytical Atomic Spectrometry, Published online link

  3. Diwakar P.K, Harilal S.S., M.C. Phillips and Hassanein A. (2014)
    Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon
    Journal of Applied Physics, 116 Art. No.133301 link

  4. Tripathi J.K., Harilal S. S., Hassanein A. (2014)
    Low Energy Ar+ ion Irradiation Induced Surface Modification in Cadmium Zinc Telluride (CdZnTe)
    Materials Research Express, 1 Art. No.035904 link

  5. Diwakar P. K., Gonzalez J. J., Harilal S. S., Russo R. E., and Hassanein A. (2014)
    Ultrafast laser ablation ICP-MS: Systematic study of role of spot size, laser fluence and repetition rate on fractionation and signal intensity,
    Journal of Analytical Atomic Spectrometry, 29, 339-346 PDF

  6. Diwakar P.K., Harilal S.S., LaHaye N.L., Hassanein A., Kulkarni P. (2013)
    The influence of laser pulse duration and energy on ICP-MS signal intensity, elemental fractionation, and particle size distribution in NIR fs-LA-ICP-MS
    Journal of Analytical Atomic Spectrometry, 28, 1420 PDF

  7. Freeman J., Harilal S.S., Diwakar P.K., Verhoff B., and Hassanein A.(2013)
    Comparison of optical emission from ns and fs LPP in atmosphere and vacuum conditions
    Spectrochimica Acta B, 87, 65-73. PDF

  8. Diwakar P.K., Harilal S.S., Freeman J. and Hassanein A.(2013)
    Role of laser pre-pulse wavelength and inter-pulse delay on signal enhancement in collinear DP-LIBS
    Spectrochimica Acta B, 87, 43-50. PDF

  9. Harilal S.S., Diwakar P.K., and Hassanein A. (2013)
    Electron-ion relaxation time dependent signal enhancement in ultrafast double-pulse laser-induced breakdown spectroscopy
    Applied Physics Letters 103 Art. No. 041102 PDF

  10. LaHaye N.L., Harilal S.S., Diwakar P.K., Hassanein A., Kulkarni P. (2013)
    The effect of ultrafast laser wavelength on ablation properties and implications on sample introduction in inductively coupled plasma mass spectrometry
    Journal Applied Physics 114, Art. No. 023103. PDF

  11. Harilal S.S., J. R. Freeman, P. Diwakar and A. Hassanein (2013)
    Comparison of nanosecond and femtosecond LIBS
    CLEO Technical Digest, Art. No. CTu2H.8 PDF

  12. Hussein A.E., Diwakar P.K., Harilal S.S. and Hassanein A.(2013)
    The role of laser wavelength on plasma generation and expansion of ablation plumes in air
    Journal of Applied Physics 113 Art. No. 143305 PDF

  13. Verhoff B., Harilal S. S., Freeman, J. R., Diwakar, P. K. and Hassanein A. (2012)
    Dynamics of fs and ns laser ablation plumes investiaged using optical emission spectroscopy
    Journal of Applied Physics 112 Art. No. 093303 PDF

  14. Harilal S.S., Miloshevsky G. V., Diwakar P.K., LaHaye N. L. and Hassanein A. (2012)
    Experimental & computational study of complex shockwave dynamics in laser ablation plumes in Ar atm
    Physics of Plasmas 19 Art. No.083504 PDF

  15. P.K. Diwakar, P.S. Kulkarni (2012). Measurement of Elemental Concentration of Aerosols Using Spark Emission Spectroscopy. Journal of Analytical Atomic Spectrometry, 27:1101-1109

  16. P.K. Diwakar, K.H. Loper, A.M. Matiaske, D.W. Hahn (2012). Laser-induced breakdown spectroscopy for analysis of micro- and nanoparticles. Journal of Analytical Atomic Spectrometry, 27:1110-1119

  17. .K. Diwakar, P. Kulkarni, M.E. Birch (2012),  New approach for near-real-time measurement of elemental composition of aerosols using laser induced breakdown spectroscopy,
    Aerosol Science and Technology, 46(3) 316-332

  18. P.K. Diwakar, S. Groh, K. Niemax, D.W. Hahn, (2010),  Study of analyte dissociation and diffusion in laser-induced plasmas: Implications for laser-induced breakdown spectroscopy,
    Journal of Analytical Atomic Spectrometry, 25:1921-1930.

  19. S. Groh, P.K. Diwakar, C.C. Garcia, A. Murtazin, K. Niemax, D.W. Hahn (2010) 100% efficient sub-nano liter sample introduction in laser-induced breakdown spectroscopy and inductively coupled plasma spectrometry: Implications for ultralow sample volumes, Analytical Chemistry, 82: 2568-2573.

  20. P.K. Diwakar, D.W. Hahn, (2008)  Study of early laser-induced plasma dynamics: transient electron density gradients via Thomson scattering and the implications on LIBS measurements,  Spectrochimica Acta B, 63:1038-1046.

  21. P.K. Diwakar, P. B. Jackson, D. W. Hahn (2007)  Investigation of multi-component aerosol particles and the effect on quantitative laser-induced breakdown spectroscopy: consideration of localized matrix effects,  Spectrochimica Acta B, 62, 1466-1474.

  22. C. A. Henry, P.K. Diwakar, D.W. Hahn  (2007)  Investigation of helium addition for laser-induced plasma spectroscopy of pure gas phase systems: analyte interactions and signal enhancement,   Spectrochimica Acta B, 62, 1390-1398.

  23. B.C. Windom P.K. Diwakar, D.W. Hahn, (2006) Dual-pulse LIBS for analysis of gaseous and aerosol systems: plasma-analyte interactions, Spectrochimica Acta B, 61, 788-796.

  24. G.D. Yoder P.K. Diwakar, D.W. Hahn, (2005) Assessment of soot particle vaporization effects during laser-induced incandescence using time-resolved light scattering,  Applied Optics, 44, 4211-4219.