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Comb-locked cavity ring-down spectroscopy with variable temperature.

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    Area of Science:

    • Spectroscopy
    • Molecular Physics
    • Cryogenics

    Background:

    • Accurate molecular absorption line shapes are crucial for spectroscopy.
    • Understanding temperature dependence is vital for spectroscopic applications.

    Purpose of the Study:

    • To develop and demonstrate a comb-locked cavity ring-down spectrometer for low-temperature measurements.
    • To investigate the temperature dependence of molecular absorption line shapes.
    • To analyze methane line assignments by comparing experimental data with databases.

    Main Methods:

    • Utilized a comb-locked cavity ring-down spectrometer with a cryogenic cooler.
    • Performed absorption spectroscopy measurements between 40 K and 300 K.
    • Recorded spectra of HD and methane (CH4) near 1.394 μm.

    Main Results:

    • Successfully measured the R(0) line of HD at 46 K, with temperature confirmed by Doppler width.
    • Acquired methane spectra across a broad temperature range (70-300 K).
    • Observed significant deviations between experimental methane line data and HITRAN/TheoReTS databases.

    Conclusions:

    • The developed spectrometer is effective for low-temperature spectroscopic studies.
    • The observed deviations highlight the need for re-evaluating methane line assignments.
    • This work provides valuable data for spectroscopic databases and applications.