Using a high pressure carbon dioxide laser with pulse lengths of 80 ns laser-induced thermal grating spectroscopy (LITGS) experiments have been carried out in gas mixtures consisting of an absorbing species (ethylene) and buffer gases (nitrogen/helium) at various temperatures and pressures. The grating structure is written into the medium by absorption and subsequent collisional relaxation of CO2-Iaser radiation. Transport properties in these mixtures such as thermal conductivity and the speed of sound have been determined from the time-resolved signal generated by Bragg scattering of a continuous wave HeNe-laser beam off the grating structure. Accurate numerical values for transport coefficients are obtained from fitting analytical expressions to the measured oscillating signal traces and are compared with literature values. © VCH Verlagsgesellschaft mbH, 1997.
|Pages (from-to)||1065 - 1070|
|Number of pages||6|
|Journal||Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics|
|Publication status||Published - 1997|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
Latzel, H., Dreier, T., Giorgi, M., & Fantoni, R. (1997). Time-resolved laser-induced thermal grating experiments induced by short pulse CO. Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics, 101(7), 1065 - 1070.