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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Multi-harmonic near-infrared-ultraviolet dual-comb spectrometer.

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    Area of Science:

    • Spectroscopy
    • Quantum optics
    • Ultrafast lasers

    Background:

    • Dual-comb spectroscopy (DCS) offers high spectral resolution but is limited in the UV-visible range.
    • Challenges exist in generating, detecting, and processing DCS data in this region.

    Purpose of the Study:

    • To extend dual-comb spectroscopy to the UV-visible range.
    • To demonstrate a method for generating and detecting UV-visible frequency combs.
    • To enable high-resolution electronic spectroscopy across a broad bandwidth.

    Main Methods:

    • Leveraging 1550 nm few-cycle pulses to generate UV-visible frequency combs.
    • Employing a wavelength-multiplexed dual-comb spectrometer.
    • Simultaneously retrieving comb-mode-resolved spectra at 386, 500, and 760 nm.

    Main Results:

    • Successful generation of frequency combs in the UV-visible spectrum.
    • Demonstration of simultaneous retrieval of 100 MHz comb-mode-resolved spectra.
    • Achieved spectral coverage from 386 nm to 760 nm.

    Conclusions:

    • This work presents a viable path towards continuous dual-comb spectroscopy from 200-750 nm.
    • The method provides unprecedented frequency resolution for electronic transitions in various materials.
    • Opens new avenues for studying atoms, molecules, and solids with high precision.