Radiocarbon's natural production, radiative decay, and isotopic rarity make it a unique tool to probe carbonaceous systems in the life and earth sciences. However, the difficulty of current radiocarbon (C) detection methods limits scientific adoption. Here, two-color cavity ring-down spectroscopy detects CO in room-temperature samples with an accuracy of one-tenth the natural abundance in 3 min. The intracavity pump-probe measurement uses two cavity-enhanced lasers to cancel out cavity ring-down rate fluctuations and strong one-photon absorption interference (>10 000 1/s) from hot-band transitions of CO isotopologues. Selective, room-temperature detection of small CO absorption signals (<1 1/s) reduces the technical and operational burdens for cavity-enhanced measurements of radiocarbon, which can benefit a wide range of applications like biomedical research and field-detection of combusted fossil fuels.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10289126 | PMC |
| http://dx.doi.org/10.1021/acssensors.2c01253 | DOI Listing |
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