Logo der Universität Wien
Sie sind hier:>Universität Wien >Fakultät für Physik


Davide Mazzotti (Italy): SCAR spectroscopy for radiocarbon measurements

Donnerstag, 22. Juni 2017, 16:30

Ort:  Victor-Franz-Hess Hörsaal, Währinger Str. 17, 1. Stock Kavalierstrakt

Radiocarbon optical detection, based on infrared laser spectroscopy, was originally proposed long time ago [1]. About 30 years later, our research group developed a novel high-sensitivity spectroscopic technique, named saturated-absorption cavity ring-down (SCAR) [2], benefiting from advantages of both conventional cavity ring-down and saturation spectroscopy. After a preliminary comprehensive investigation of the infrared spectrum of 14C16O2 at 4.5 μm with a highly enriched sample [3], we demonstrated the first radiocarbon detection at natural abundance with all optical technique [4]. Linearity and
accuracy of SCAR-based radiocarbon dioxide concentration measurements were also characterized comparing results with AMS [5].
After refining the data fitting model [6] and upgrading the experimental apparatus in terms of simplicity, transportability, immunity to interferences and data acquisition rate, we have recently achieved measurement precision and repeatability which promise to challenge the AMS performance in the near future [7].

[1] Labrie et al., J. Appl. Phys. A 24, 381 (1981).
[2] Giusfredi et al., Phys. Rev. Lett. 104, 110801 (2010).
[3] Galli et al., Mol. Phys. 109, 2267 (2011).
[4] Galli et al., Phys. Rev. Lett. 107, 270802 (2011).
[5] Galli et al., Radiocarbon 55, 213 (2013).
[6] Giusfredi et al., J. Opt. Soc. Am. B 32, 2223 (2015).
[7] Galli et al., Optica 3, 385 (2016).

Fakultät für Physik
Universität Wien

Boltzmanngasse 5
1090 Wien

Öffnungszeiten Dekanat:
Di, Mi, Fr 9-12 Uhr
Do 14-16 Uhr

T: +43-1-4277-510 01
F: +43-1-4277-9 510
Universität Wien | Universitätsring 1 | 1010 Wien | T +43-1-4277-0