Abstract
Although sulfuryl fluoride (SO2F2) is an efficient fumigant that does not react with the surface of indoor materials and does not reduce the stratospheric ozone shield, there are some concerns about its use. It is a toxic gas that attacks the central nervous system, and its global warming potential (GWP) value is 4780 for 100 years’ time. Therefore, it is a clear necessity of implementing detection methods for tracing such a molecule. In this work a sensitive photoacoustic setup was built to detect SO2F2 at concentrations of parts per billion by volume (ppbv). The symmetric S–O stretching mode was excited by a continuous-wave quantum cascade laser with radiation wavenumber ranging from 1275.7 to 1269.3 cm−1. The photoacoustic signal was generated by modulating the laser wavenumber at the first longitudinal mode of the photoacoustic cell with amplitude depth of 5 × 10−3 cm−1. The detection of a minimum SO2F2 concentration of 20 ppbv was achieved.
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Acknowledgements
Capes-DAAD (Probral), CNPq, and FAPERJ are gratefully acknowledged for the financial support and scholarships, which made possible the stay of students in Stuttgart to perform this work. Mr. Z. Dubovski deserves the credit for his most valuable technical assistance.
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Minini, K.M.S., Bueno, S.C.E., da Silva, M.G. et al. Quantum cascade laser-based photoacoustic sulfuryl fluoride sensing. Appl. Phys. B 123, 61 (2017). https://doi.org/10.1007/s00340-017-6642-x
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DOI: https://doi.org/10.1007/s00340-017-6642-x