Abstract
AbstractUsing 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‐laser 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.
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