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Sub-Doppler Heterodyne Frequency Measurements on OCS Near 2900 cm-1 Using a CO Overtone Sideband Spectrometer

Frech1, Mürtz, Palm

  • 1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, Bonn, D-53115, Germany

Journal of Molecular Spectroscopy
|December 16, 1998
PubMed
Summary

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High-precision frequency measurements of carbonyl sulfide (OCS) rovibrational transitions were achieved using a tunable CO overtone laser. These results provide improved calibration tables for infrared spectrometers near 2900 cm-1.

Area of Science:

  • Molecular Spectroscopy
  • Quantum Optics
  • Laser Physics

Background:

  • Accurate spectroscopic data are crucial for calibrating infrared instruments.
  • Carbonyl sulfide (OCS) exhibits rovibrational transitions in the mid-infrared region.
  • Previous measurements had limitations in precision and coverage.

Purpose of the Study:

  • To perform sub-Doppler heterodyne frequency measurements on OCS transitions.
  • To improve the accuracy of OCS transition frequencies.
  • To generate updated calibration tables for infrared spectrometers.

Main Methods:

  • Utilized a CO overtone laser with microwave sidebands for frequency tuning.
  • Employed frequency offset-locking to CO2 laser standards for high precision.

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  • Achieved measurement uncertainties below 30 kHz (Δν/ν = 3 x 10⁻¹⁰).

    • Main Results:

    • Measured frequencies for 10 rovibrational transitions of OCS between 2894 and 2910 cm⁻¹.
    • Combined new data with existing measurements for improved accuracy.
    • Recalculated calibration tables for specific OCS bands (10⁰1-00⁰0, 11¹e1-01¹e0, 11¹f1-01¹f0).

    Conclusions:

    • The study provides highly accurate OCS transition frequencies.
    • The new calibration tables are suitable for infrared spectrometers around 87 THz.
    • Enhanced precision in spectroscopic measurements facilitates advancements in metrology and instrumentation.