Spectroscopic detection of radiocarbon dioxide at parts-per-quadrillion sensitivity

Galli, Iacopo; Bartalini, S.; Ballerini, R.; Barucci, M.; Cancio, P.; Pas, Marco De; Giusfredi, G.; Mazzotti, D.; Akikusa, Naota; Natale, P. De

doi:10.1364/optica.3.000385

Cited by 110 publications

(86 citation statements)

References 26 publications

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“…Nevertheless, considering the narrow ro-vibrational transitions in small gas molecules, a range of new measurement approaches expanding on direct absorption spectroscopy have been demonstrated to feature important advantages in terms of ruggedness as well as sensitivity [13,14]. Some of these novel approaches exploit molecular dispersion, rather than absorption, to decouple the recorded quantity (phase or frequency) from the laser intensity [15,16].…”

Section: Introductionmentioning

confidence: 99%

A quantum cascade laser-based Mach–Zehnder interferometer for chemical sensing employing molecular absorption and dispersion

et al. 2018

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We employ a novel spectroscopic setup based on an external cavity quantum cascade laser and a Mach-Zehnder interferometer to simultaneously record spectra of absorption and dispersion of liquid samples in the mid-infrared. We describe the theory underlying the interferometric measurement and discuss its implications for the experiment. The capability of simultaneously recording a refractive index and absorption spectrum is demonstrated for a sample of acetone in cyclohexane. The recording of absorption spectra is experimentally investigated in more detail to illustrate the method's capabilities as compared to direct absorption spectroscopy. We find that absorption signals are recorded with strongly suppressed background, but with smaller absolute sensitivity. A possibility of optimizing the setup's performance by unbalancing the interferometer is presented.

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Section: Introductionmentioning

confidence: 99%

A quantum cascade laser-based Mach–Zehnder interferometer for chemical sensing employing molecular absorption and dispersion

et al. 2018

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“…near-infrared and MIR with linewidths at the few kHz level (and less) reachable using different stabilization techniques as those based on ultra-stable cavities [32,44] or whispering gallery mode microresonators [45,46]. In addition, optical frequency comb (OFC) disciplined laser sources [31,47] or directly OFC's as spectroscopic sources [48][49][50][51] provide sub Hz control level of the absolute frequency.…”

Section: Discussionmentioning

confidence: 99%

Linestrength ratio spectroscopy as a new primary thermometer for redefined Kelvin dissemination

et al. 2019

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Experimental methods for primary thermometry, after Kelvin unit redefinition on May 2019, become based on a known value of the Boltzmann constant rather than by measuring temperature with respect to a reference point. In this frame, we propose linestrength ratio thermometry (LRT) as a candidate method for primary thermometry in the 9-700 K temperature range. Temperature accuracies at the ppm level are prospected for LRT applied to optical transitions of the CO molecule in the range 80-700 K and of a rare-earth-doped crystal in the 9-100 K one. Future implementations of this technique can contribute to measure the calibration-discrepancies in the ITS-90 metrological scale of thermodynamic temperature which can have a measurable impact in applications ranging from fundamental-physics to meteorology and climatology.

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“…Examples are given in previous studies. 10,11,15 Further, the absorption spectra are based on transitions from the ground state. Interestingly, the CRDS work in 14 CO 2 could only be carried out recently due to technological advances on metrology and stabilization of continuously tunable extremely narrow band lasers over a relatively large wavelength range.…”

Section: Introductionmentioning

confidence: 99%

Laser‐based radiocarbon detection in the laboratory: How soon?

Murnick

2019

Labelled Comp Radiopharmac

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Research over the past 25 years and the use of accelerator mass spectrometry (AMS) have demonstrated benefits of single‐atom counting of 14C compared with scintillation monitoring of 14C radioactive decay for a multitude of applications in drug development studies. These include pharmacokinetics and metabolism studies, microdosing studies, and quantification of DNA adducts. In the last decade, the possibility of single‐atom counting using lasers has been demonstrated, providing the possibility of simplified laboratory‐based systems, which can equal or excel AMS sensitivity and provide scintillation system convenience without high levels of radioactivity. To achieve the required sensitivity, optical storage cavities have been used to enhance the laser interaction of the low densities of radiocarbon present. Two types of laser technologies have been used‐cavity ring‐down spectroscopy (CRDS) and intracavity opto‐galvanic spectroscopy (ICOGS). Problems to be overcome to achieve routine use have included separation of the 14C signal from backgrounds, achievement of acceptable precision and accuracy, reduction of measurement times for small samples, and improvement in the ease of use for the operator. Both technologies have achieved impressive results to date using samples of order 1 mg with CRDS and 10 μg with ICOGS. Commercial development is the next step.

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Spectroscopic detection of radiocarbon dioxide at parts-per-quadrillion sensitivity

Cited by 110 publications

References 26 publications

A quantum cascade laser-based Mach–Zehnder interferometer for chemical sensing employing molecular absorption and dispersion

A quantum cascade laser-based Mach–Zehnder interferometer for chemical sensing employing molecular absorption and dispersion

Linestrength ratio spectroscopy as a new primary thermometer for redefined Kelvin dissemination

Laser‐based radiocarbon detection in the laboratory: How soon?

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