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Simultaneous detection of 14NO and 15NO using Faraday modulation spectroscopy

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Abstract

We describe a technique of simultaneous detection of 14NO and 15NO by means of Faraday Modulation Spectroscopy (FAMOS) based on a cw distributed feedback quantum cascade laser (QCL) operating near 5.4 μm. FAMOS is a spectroscopic method for selective, sensitive, and time-resolved detection of free radical molecules such as NO, in the mid-infrared spectral region. The selected spectral lines are the Q (1.5) for 15NO located at 1842.76 cm−1 and the P (9.5) for 14NO located at 1842.93 cm−1. The detection limit (1σ) of 6 ppb \(/\sqrt{\mathrm{Hz}}\) for 15NO and 62 ppb \(/\sqrt{\mathrm{Hz}}\) for 14NO has been achieved. The simultaneous detection was performed using a fast laser frequency switching between the two isotopologues with a time resolution of 2 s. The isotope ratio (δ 15N) has been determined with a precision (1σ) of 0.52‰ at 800-s averaging time for 100 ppm NO-gas with a time resolution of 2 s. δ 15N is determined after NO release from nitrite by chemical reduction with potassium iodine.

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Authors and Affiliations

  1. Institut für Lasermedizin, Universitat Düsseldorf, 40225, Düsseldorf, Germany

    H. Sabana, T. Fritsch, P. Hering & M. Mürtz

  2. Centre for Atomic Molecular Physics and Quantum Optics (CEPAMOQ), University of Douala, P.O. Box 8580, Douala, Cameroon

    H. Sabana, M. Boyomo Onana & O. Bouba

Authors
  1. H. Sabana
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  2. T. Fritsch
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  3. M. Boyomo Onana
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  4. O. Bouba
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  5. P. Hering
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  6. M. Mürtz
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Correspondence to H. Sabana.

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Sabana’s permanent adress: CEPAMOOQ, University of Douala, P.O. Box 8580, Douala, Cameroon.

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Sabana, H., Fritsch, T., Boyomo Onana, M. et al. Simultaneous detection of 14NO and 15NO using Faraday modulation spectroscopy. Appl. Phys. B 96, 535–544 (2009). https://doi.org/10.1007/s00340-009-3602-0

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  • DOI: https://doi.org/10.1007/s00340-009-3602-0

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