Simultaneous determination of the spatial profile of the laser beam and vibrational-to-translational relaxation time by pulsed photoacoustics |
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| Authors: | MD Rabasović JD Nikolić DD Markushev |
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| Institution: | (1) Institute of Physics, Pregrevica 118, 11080 Belgrade-Zemun, Serbia;(2) Institute of Nuclear Science Vinča, P.O. Box 522, 11001 Belgrade, Serbia |
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| Abstract: | Measuring the vibrational-to-translational relaxation time τV-T in gases is one of the applications of pulsed photoacoustic spectroscopy. Unfortunately, the spatial profile of the laser
beam can significantly influence the accuracy of these measurements. Namely, minor changes in the spatial profile of the laser
beam cause significant errors in the τV-T measuring. We present a method for simultaneous determination of the spatial profile of the laser beam and vibrational-to-translational
relaxation time. It is based on the temporal shape of the photoacoustic pulse and utilizes a mathematical algorithm developed
for photoacoustic tomography.
PACS 39.30.+w; 82.80.Kq; 07.57.Ty |
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