Experimental study demonstrates high-resolution trace gas detection using a high-finesse terahertz cavity, highlighting sensitive quantification of hydrogen sulfide down to 60 parts per billion.
The development of a high-finesse THz cavity has enabled the construction of a Fabry–Perot spectrometer. This approach can be applied to the THz frequencies (submillimeter wavelengths) allowing the rotational transitions to be probed. The intracavity power levels have permitted the sub-Doppler Lamb-dip profiles of ethanol to be observed. The quantification of a trace of H2S is demonstrated with a detection limit around 60 part per billion (ppb).
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Elmaleh et al. (2023) studied this question.
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