Diode laser spectroscopy of carbon dioxide at 780 nm and methane at 840 nm (Abstract/Poster in atti di convegno)

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  • Diode laser spectroscopy of carbon dioxide at 780 nm and methane at 840 nm (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Lucchesini, S. Gozzini (2005)
    Diode laser spectroscopy of carbon dioxide at 780 nm and methane at 840 nm
    in MMD Meeting - Matter, Materials and Devices, Genova
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Lucchesini, S. Gozzini (literal)
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  • Meeting Workbook: Poster Session, p.33 (literal)
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  • Overtone absorption lines of carbon dioxide and methane have been examined by using a diode laser (DL) spectrometer in the region around 12800 and 11900 cm^-1 respectively. The spectrometer uses commercially available double heterostructure InGaAlAs and AlGaAs DLs sources operating in \"free-running\" mode. In order to detect these very weak \"overtone\" features the sensitivity of the apparatus is increased by the use of the wavelength modulation spectroscopy (WMS) with the phase detection technique and a long optical path length obtained by using a Herriott type measurement cell. By this way the minimum detected absorption coefficient was 1.4x10^-8 cm^-1. These techniques permitted also the measurement of some collisional broadening and shifting coefficients by different buffer gases at room temperature. For this purpose a fit procedure that takes into account the instrumental effects has been adopted. The resolving power (~10^7) of the spectrometer allowed the detection of the absorption resonance positions with a maximum error of 0.01cm^-1. This let us obtain the CO_2 band parameters with a good precision. (literal)
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  • IPCF-CNR Pisa (literal)
Titolo
  • Diode laser spectroscopy of carbon dioxide at 780 nm and methane at 840 nm (literal)
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