INO
CNR
vai_a_storia   vai_a_organizzazione   vai_a_sedi   vai_a_personale   Area Riservata
    English English Version  
 
 

Molecular gas sensing below parts per trillion: radiocarbon-dioxide optical detection

  Articoli su Riviste JCR/ISI  (anno 2011)

Autori:  Galli I., Bartalini S., Borri S., Cancio P., Mazzotti D., De Natale P., Giusfredi G

Affiliazione Autori:  Istituto Nazionale di Ottica CNR, I-50019 Sesto Fiorentino, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), I-50019 Sesto Fiorentino, Italy

Riassunto:  Radiocarbon ((14)C) concentrations at a 43 parts-per-quadrillion level are measured by using saturated-absorption cavity ringdown spectroscopy by exciting radiocarbon-dioxide ((14)C(16)O(2)) molecules at the 4.5 mu m wavelength. The ultimate sensitivity limits of molecular trace gas sensing are pushed down to attobar pressures using a comb-assisted absorption spectroscopy setup. Such a result represents the lowest pressure ever detected for a gas of simple molecules. The unique sensitivity, the wide dynamic range, the compactness, and the relatively low cost of this table-top setup open new perspectives for (14)C-tracing applications, such as radiocarbon dating, biomedicine, or environmental and earth sciences. The detection of other very rare molecules can be pursued as well thanks to the wide and continuous mid-IR spectral coverage of the described setup.

Rivista/Giornale:  PHYSICAL REVIEW LETTERS
Volume n.:  107 (27)      Pagine da: 270802  a: 270802
Ulteriori informazioni:  We thank V. Perevalov, V.E. Zuev Institute of Atmospheric Optics-Russian Academy of Science, for calculating molecular data and M. Fedi, University of Firenze and INFN, for discussions about AMS dating. We gratefully acknowledge Michele Giusfredi for his support in the 2010 CO2 gas preparation. This work was partially supported by Ente Cassa di Risparmio di Firenze and by Regione Toscana through the project CTOTUS, in the framework of POR-CReO 2007-2013.
DOI: 10.1103/PhysRevLett.107.270802

*Impact Factor della Rivista: (2011) 7.370   *Citazioni: 103
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

Riferimenti visionabili in IsiWeb of Knowledge: (solo per sottoscrittori)
Per visualizzare la scheda dell'articolo su IsiWeb: Clicca qui
Per visualizzare la scheda delle Citazioni dell'articolo su IsiWeb: Clicca qui

INO © Istituto Nazionale di Ottica - Largo Fermi 6, 50125 Firenze | Tel. 05523081 Fax 0552337755 - P.IVA 02118311006     P.E.C.    Info