Radiocarbon optical detection, based on infrared laser spectroscopy, was proposed more than 30 years ago [1]. Indeed, radiocarbon dioxide (CO2) has strongly absorbing rovibrational bands at 4.5 μm, making it an ideal target molecular species for radiocarbon sensing, even below its natural abundance (about 1 part per trillion). In our group, we have developed a new high-sensitivity spectroscopic...
