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Activities of the IACS group are both theoretical and experimental. The latter one comprises the design and development of a novel technique for the in situ and real time measurement of the isotopic composition of dissolved gases by cavity enhanced spectroscopy. This technique exploits Optical Frequency Comb (OFCA) technology to provide a highly precise light source for Doppler-free spectroscopy measurements. This Spectroscopy system was recently validated on a set of samples containing CD3OD and CD3SO3CF3. The expected accuracy of this new technique is 0.2 ppmv for CH4 and 0.1 o for δ18O. This is the basis for the design of the IACS detectors. In addition, using an ultra-stable Tm-doped fiber laser, the group is exploring the possibility to reach a lower limit of detection of 0.2 ppbv for CH4 and 0.2o for δ18O, by measuring the Doppler-free shift of the absorption peak of a gas sample mixed with water. This technique could be applied to the detection of traces of CH4 in water. To this goal we developed a photo-acoustic cell able to work at 10 Hz repetition rate. In addition, we are designing a new home-made ice-crushing system for the extraction of bubbles trapped in a large volume of ice in order to perform gas measurements. The new optical spectrometer and the gas extraction system will be tested for the first time this summer at the Concordia station (Switzerland) and then employed for a first Antarctic test campaign in 2016/17.
Abstracts and final manuscripts will be submitted to the CSC conference. [1] R. Grilli, C. Abd-Alrahman, G. Mjean, and D. Romanini, 'The Design and Development of a Molecule Specific Hydrogen and CH4 Molecule Analyser for Antarctica,' J. Hydrogen Energy, vol. 41, no. 20, pp. 3400-3413, 2016. [2] R. Grilli, C. Abd-Alrahman, G. Mjean, and D. Romanini, 'The Design and Development of a Molecule Specific Hydrogen and CH4 Molecule Analyser for Antarctica: Final Report,’ J. Hydrogen Energy, vol. 42, no. 4, pp. 2784-2797, 2017. [3] R. Grilli, C. Abd-Alrahman, G. Mjean, and D. Romanini, ‘From ice cores to atmosphere: the first chemical annual monitoring of atmospheric greenhouse gases in an ice core in Antarctica,’ J. Hydrogen Energy, vol. 42, no. 2, pp. 725-741, 2017.
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