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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Chemical Sensing

    Background:

    • Accurate detection and localization of chemical vapors are crucial for environmental monitoring, industrial safety, and security applications.
    • Existing methods often lack the required spatial resolution or molecule specificity for complex environments.

    Purpose of the Study:

    • To present a novel technique for spatially resolved and molecule-specific chemical vapor detection.
    • To demonstrate the feasibility of achieving millimeter-scale spatial resolution in vapor plume identification.

    Main Methods:

    • Utilizes a transient absorption spectroscopy approach involving ultraviolet (UV) excitation to Rydberg states.
    • Employs a near-infrared (NIR) or visible probe pulse to record the absorption spectrum for molecule identification.
    • Determines distance to the vapor by measuring the time-of-flight of a reflected NIR pulse from a distant object.

    Main Results:

    • The technique provides molecule-specific detection of chemical vapors.
    • Millimeter-scale spatial resolution was achieved in the detection of acetone plumes.
    • Successful demonstration of distance measurement to the chemical absorber.

    Conclusions:

    • The presented method offers a promising new tool for precise chemical vapor sensing.
    • This technique enables simultaneous chemical identification and precise spatial localization of vapors.
    • Potential applications include standoff detection and real-time environmental monitoring.