Comb-assisted cavity ring-down spectroscopy of a buffer-gas-cooled molecular beam

Year: 2016

Authors: Santamaria L., Di Sarno V., De Natale P, De Rosa M., Inguscio M., Mosca S., Ricciardi I., Calonico D.,
Levi F., Maddaloni P.

Autors Affiliation: Ist Nazl Ottica, CNR INO, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy; Complesso Univ MS Angelo, Ist Nazl Fis Nucl, Sez Napoli, Via Cintia, I-80126 Naples, Italy; CNR INO, Largo Fermi 6, I-50125 Florence, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy; Ist Nazl Ric Metrol, INRIM, Str Cacce 91, I-10135 Turin, Italy.

Abstract: We demonstrate continuous-wave cavity ring-down spectroscopy of a partially hydrodynamic molecular beam emerging from a buffer-gas-cooling source. Specifically, the (n1 + n3) vibrational overtone band of acetylene (C2H2) around 1.5 mm is accessed using a narrow-linewidth diode laser stabilized against a GPS-disciplined rubidium clock via an optical frequency comb synthesizer. As an example, the absolute frequency of the R(1) component is measured with a fractional accuracy of B1  109. Our approach represents the first step towards the extension of more sophisticated cavity-enhanced interrogation schemes, including saturated absorption cavity ring-down or two-photon excitation, to buffer-gascooled
molecular beams.

Journal/Review: PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Volume: 18 (25)      Pages from: 16715  to: 16720

More Information: The authors acknowledge technical support by G. Notariale and fruitful discussions with G. Santambrogio. This work was funded by MIUR-FIRB project RBFR1006TZ and by INFN project SUPREMO.
KeyWords: Buffer gas cooling; Cavity ring-down spectroscopy
DOI: 10.1039/c6cp02163h

Citations: 27
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