Femto-Fourier transform-cavity enhanced absorption spectroscopy in a supersonic expansion

Abstract

Proofs of principle spectra of C₂H₄, N₂O and C₂H₂, including H¹²C¹³CH in natural abundance, are reported, recorded in the 1.6 µm range in an Ar supersonic expansion using femto-Fourier transform–cavity enhanced absorption spectroscopy. The effective absorption pathlength in the jet-cooled sample is up to 78 m and the optimal S/N is over 2300. The data processing is detailed. Saturation effects are reported for the C₂H₂ bands.

Keywords:

• cavity enhanced absorption
• free supersonic expansion
• Fourier transform spectroscopy
• femto comb spectroscopy

Acknowledgments

We thank Dr S. Kassi (Grenoble) for the femto laser set-up. We also thank Professor K.K. Lehmann (Virginia) for reading the manuscript and Dr K. Didriche and Dr T. Földes (ULB) for background support concerning the operation of the supersonic expansion facilities. We are indebted to Dr C. Western (Bristol) for the PGOPHER software. This work was sponsored in Belgium by the Action de Recherches Concertées de la Communauté française de Belgique.

Notes

FRIA researcher

FRIA researcher

Additional information

Notes on contributors

X. de Ghellinck d’Elseghem Vaernewijck

FRIA researcher

D. Golebiowski

FRIA researcher