Ranil Gurusinghe

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Ranil  Gurusinghe, Ph.D.


Assistant Professor



Email Address:


(931) 372-6849


Lab Science Commons, Rm 2316


Ph.D., Physical Chemistry, Kent State University, 2016
BS, Chemistry, University of Peradeniya (Sri Lanka), 2010

Professional Experience:
Tenure-track Assistant Professor of Physical Chemistry, 2022 - Current
Research Scientist, University of Missouri-Columbia, 2019 - 2022
R&D Scientist, Hikma Pharmaceuticals, 2016 – 2019

Gurusinghe Lab, “Gru Lab”, studies spectroscopy, reaction dynamics, and kinetics using various Fourier transform microwave and millimeterwave (FTMW and FTmmW) spectroscopic and resonance-enhanced ionization techniques that are developed and implemented in our laboratory.


Areas of research interest:

  • Rotational spectra of interstellar radicals
  • Dynamics of chemical reactions in planetary atmospheres
  • Low-temperature kinetics of photochemically initiated chemical reactions studied in CRESU flows
  • Geometry and interactions of weakly bound molecular complexes
  • Quantum-tunneling and nuclear quadrupole coupling interactions in molecules
  • Resonance-enhanced multiphoton ionization of molecular species

Gru lab welcomes TTU students who are interested in learning and implementing spectroscopic instrument development, laser techniques, molecular beams, spectroscopic data fitting, and computational modeling.


Key Publications:

R.M. Gurusinghe, N. Dias, R. Krueger, A. G. Suits. “Uniform supersonic flow sampling for detection by chirped-pulse rotational spectroscopy”, J. Chem. Phys. 156, 014202 (2022). Link

R.M. Gurusinghe, N. Dias, A. M. Mebel, A. G. Suits. “Radical–Radical Reaction Dynamics Probed Using Millimeterwave Spectroscopy: Propargyl + NH2/ND2”, J. Phys. Chem. Lett. 13, 91–97 (2022). Link

R. M. Gurusinghe, A. Fox-Loe, M. J. Tubergen. “Structures of guaiacol and the guaiacol-argon van der Waals complex from rotational spectroscopy of guaiacol isotopologues”. J. Mol. Struct. 1246 (2021). Link

R. M. Gurusinghe, M. J. Tubergen. “Probing the Electronic Environment of Methylindoles using Internal Rotation and 14N Nuclear Quadrupole Coupling”. J. Phys. Chem. A 2016, 120, 3491–3496 (2016). Link