Field measurements of volcanic gases using tunable diode laser based mid-infrared and Fourier transform infrared spectrometers |
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| Institution: | 1. Royal Institute for Cultural Heritage, Jubelpark 1, B-1000 Brussels, Belgium;2. Asociación Talayots.com, c/Rei Sanç, 12-2°A., 07004 Palma de Mallorca, Spain;3. Independent Archaeologist, C/Fray Joan Ballester, 74 2-3D, 07630 Campos, Islas Baleares, Spain;4. Department of Archaeology, Ghent University, Sint-Pietersnieuwstraat 35, 9000 Ghent, Belgium |
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| Abstract: | The first field measurements of volcanic gases using mid-IR difference frequency laser spectroscopy are reported. The results were obtained at the summit crater of Masaya volcano, Nicaragua, with the gases being drawn into a multi-pass cell and measured at reduced pressure. Automated sensitive and selective detection of CO2, SO2, H35,37Cl, H2O, and CH4 was achieved. Simultaneous measurements obtained with open-path Fourier transform spectroscopy provide a useful comparison of the two optical techniques. We also consider the potential measurement of CO2 isotopic ratios in volcanic gases using laser-based spectroscopy. |
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