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Simultaneous determination of the spatial profile of the laser beam and vibrational-to-translational relaxation time by pulsed photoacoustics

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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.

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Authors and Affiliations

  1. Institute of Physics, Pregrevica 118, 11080, Belgrade-Zemun, Serbia

    M.D. Rabasović & D.D. Markushev

  2. Institute of Nuclear Science Vinča, P.O. Box 522, 11001, Belgrade, Serbia

    J.D. Nikolić

Authors
  1. M.D. Rabasović
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  2. J.D. Nikolić
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  3. D.D. Markushev
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Correspondence to M.D. Rabasović.

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PACS

39.30.+w; 82.80.Kq; 07.57.Ty

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Rabasović, M., Nikolić, J. & Markushev, D. Simultaneous determination of the spatial profile of the laser beam and vibrational-to-translational relaxation time by pulsed photoacoustics. Appl. Phys. B 88, 309–315 (2007). https://doi.org/10.1007/s00340-007-2697-4

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  • DOI: https://doi.org/10.1007/s00340-007-2697-4

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