Spectroscopic Investigations

Spectroscopic Investigations

Details

​Spectroscopy is concerned with the absorption, emission or scattering or electromagnetic radiation by atoms or molecules​. Electromagnetic radiation covers a wide wavelength range, from radio waves to gamma-rays, and the atoms may be in the gas, liquid or solid phase. Our group primarily focuses on absorption strategies applied to gaseous flows. We combine experimental measurements with theoretical modeling to understand complex spectroscopic issues. Some of the topics currently being investigated in our laboratory include:

  • Cross-section measurements at high pressures and high temperatures using FTIR and DFG (Difference Frequency Generation) ​systems
  • Absorption spectroscopy in high-density gases
  • Line-mixing or collisional interference effects
  • Collisional narrowing effects
The figure below shows absorption measurement of 1.5 % CO2 / Air mixture. The deviation from the Lorentzian​ simulation is a result of line mixing effects which become very important at high densities. 

Spectra of CO2