Dr. Sylvestre Twagirayezu

Dr. Sylvestre Twagirayezu
Dr. Sylvestre Twagirayezu
Assistant Professor
Ph. (409) 880-7904

Email: stwagirayezu@lamar.edu


2006 – 2011 The University of Akron, Akron, OH
Ph.D., Physical Chemistry

2004 – 2006 Case Western Reserve University, Cleveland, OH
M.S., Chemistry

2000 – 2004 LaRoche College, Pittsburgh, PA
B.S., Chemistry

Research Interests

Our research group employs spectroscopic tools to investigate the energy level patterns and dynamics of isolated gas species relevant to remote atmospheric sensing, environmental protection, hydrocarbon combustion, and petroleum chemistry.  Current efforts include understanding the roles of large-amplitude motion in the vibrational excited states, precise measurement of line shape and absolute line position, characterization of polar impurities in the petroleum mixtures, and finally the development of highly sensitive experiments.

Selected Publicatons

  1. Lees R.M, Xu LH, Guislain B.G, Reid E.M, Twagirayezu S., Perry D.S, BP Thapaliya BP, Dawadi MB, Billinghurst BE, J. Mol. Spectrosc., Torsion-rotation structure and quasi-symmetric-rotor behaviour for the CH3SH asymmetric CH3-bending and CH stretching bands of E parentage, 2018, 343, 18-27.
  2. Guislain B.G, Reid E.M, Lees R.M,Xu LH, Twagirayezu S., Perry D.S, BP Thapaliya BP, Dawadi MB, Billinghurst BE, J. Mol. Spectrosc., Giant K-doubling and in-plane/out-of-plane mixing in the asymmetric methyl-bending bands of CH3SH (2017), 335, 37-42
  3. Twagirayezu S., Hall E.G., Sears, J.T, Quadrupole splittings in the near-infrared spectrum of 14NH3, J. Chem. Phys. (2016), 145 , 14, 144302
  4. S. Twagirayezu, M.J. Cich, G.E. Hall, C.P. Mcraven, T.J. Sears, Frequency Comb-Referenced Spectroscopy for and hot bands in the band of Acetylene, J. Mol. Spectrosc. (2015) 316, 64-71
  5. D. Forthomme, M.J. Cich, S. Twagirayezu, G.E. Hall, T.J. Sears, Application of the Hartmann–Tran profile to precise experimental data sets of 12C2H2, JQRT, 165 (2015) 165, 28-37
  6. M. B. Dawadi, S.Twagirayezu, D. S. Perry and B.E. Billinghurst, High-resolution Fourier transform infrared synchrotron spectroscopy of the NO2 in-plane rock band of nitromethane, J. Mol. Spectrosc. (2015) 315, 10-15
  7. S. Twagirayezu, et al., IR and FTMW-IR Spectroscopy and Vibrational Relaxation Pathways in the CH Stretch Region of CH3OH and CH3OD, J. Phys. Chem. A, 115 (2011) 9748-9763.
  8. S. Twagirayezu, et al., Vibrational Coupling Pathways in Methanol As Revealed by Coherence-Converted Population Transfer Fourier Transform Microwave Infrared Double-Resonance Spectroscopy,J. Phys. Chem. A, 114 (2010) 6818-6828
  9. S. Twagirayezu, et al., Coherence-converted population transfer FTMW-IR double resonance spectroscopy of CH3OD in the OD-stretch region, J. Mol. Spectrosc. 262 (2010) 65-68