Scientific Results

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: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, Pozzuoli, 80078, Italy; INFN, Istituto Nazionale di Fisica Nucleare Sez. di Napoli Complesso, Universitario di M.S. Angelo, Via Cintia, Napoli, 80126, Italy; CNR-INO Largo Fermi 6, Firenze, 50125, Italy; INFN, Istituto Nazionale di Fisica, Sez. di Firenze Via G. Sansone 1, Sesto Fiorentino, 50019, Italy; INRIM, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino, 10135, 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 (PRINT)

Volume: 18      Pages from: 16715  to: 16720

KeyWords: Buffer gas cooling; Cavity ring-down spectroscopy
DOI: 10.1039/c6cp02163h

Citations: 12
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