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Detection of methane with mid-infrared polarization spectroscopy

In English

Författare

Summary, in English

We report on the application of polarization spectroscopy in the midinfrared spectral region for the detection of methane by probing its asymmetric ro-vibrational transitions. Tunable infrared laser radiation, near 3.4 mum, was obtained from difference-frequency generation in a LiNbO3 crystal. Infrared polarization spectroscopy (IRPS) spectra of the P, Q and R branches of the nu(3) band, recorded with both linearly and circularly polarized pump beams, are presented. The experiments were performed in an atmospheric pressure gas jet with methane diluted with Ar. An IRPS spectrum with signal-to-noise ratio better than 10(4) was observed. The dependence of the IRPS signal intensity on the methane mole fraction and on the pumping laser power density was investigated.

Publiceringsår

2004

Språk

Engelska

Sidor

135-138

Publikation/Tidskrift/Serie

Applied Physics B

Volym

79

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0946-2171