Time-resolved laser-induced thermal grating experiments induced by short pulse CO

H. Latzel, T. Dreier, M. Giorgi, R. Fantoni

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Abstract

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.
Original languageEnglish
Pages (from-to)1065 - 1070
Number of pages6
JournalBerichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
Volume101
Issue number7
Publication statusPublished - 1997
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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