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    Area of Science:

    • Molecular Spectroscopy
    • Terahertz (THz) Science
    • Spectrometer Development

    Background:

    • Synchrotron radiation (SR) is crucial for terahertz (THz) molecular spectroscopy due to its brightness and broadband nature.
    • Current SR-based measurements are limited to ~30 MHz resolution by Fourier-transform infrared spectroscopy (FTIR).
    • Observing fine spectral features requires higher resolution, particularly for internal molecular dynamics and angular momentum couplings.

    Purpose of the Study:

    • To develop a novel spectrometer for enhanced resolution in THz molecular spectroscopy.
    • To achieve sub-MHz resolution using SR and a THz molecular laser.
    • To enable Doppler-limited spectroscopy across a wide THz frequency range.

    Main Methods:

    • Development of a spectrometer utilizing heterodyne mixing.
    • Integration of SR with a newly available THz molecular laser (1-5.5 THz).
    • Demonstration of THz comb mixing with the molecular laser.

    Main Results:

    • Achieved a spectral resolution of 80 kHz, a significant improvement over previous methods.
    • Enabled sub-MHz, Doppler-limited spectroscopy across the 1-5.5 THz range.
    • Demonstrated the potential for precise molecular transition frequency determination.

    Conclusions:

    • The developed spectrometer is the first SR-based instrument capable of sub-MHz resolution in the THz region.
    • This advancement allows for the observation of closely spaced spectral features.
    • Future applications include highly precise molecular frequency measurements using THz combs.