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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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 and Visible (UV–Vis) Spectroscopy: Overview01:02

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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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Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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Characterization of optical coatings using a multisource table-top scatterometer.

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    This study introduces a new scatterometer for detailed surface analysis. It effectively characterizes thin films, revealing differences in contamination sensitivity between surfaces and coatings.

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    Area of Science:

    • Optical Engineering
    • Surface Science
    • Metrology

    Background:

    • Light scattering is crucial for characterizing optical and non-optical surfaces.
    • Existing methods may lack comprehensive post-measurement analysis capabilities.
    • Characterizing thin-film coatings requires precise surface and roughness analysis.

    Purpose of the Study:

    • To implement and utilize a novel scatterometer with multiple visible laser sources and 3D spherical detection.
    • To enable comprehensive characterization of thin-film coatings and substrates, including surface roughness, growth, and contamination.
    • To analyze spectral sensitivity to contamination and power losses in reflective coatings.

    Main Methods:

    • Integration of three visible laser sources into a sensitive table-top scatterometer.
    • Utilizing wavelength scaling for characterization of surface roughness and contamination.
    • Employing topographic measurement techniques for result verification.

    Main Results:

    • The scatterometer successfully characterized thin-film coatings and substrates.
    • Demonstrated significantly different spectral sensitivities to contamination (scatter loss) for single surfaces versus interference coatings.
    • Analyzed power losses in highly reflective coatings.

    Conclusions:

    • The developed scatterometer provides enhanced capabilities for detailed surface and thin-film characterization.
    • Wavelength scaling is effective for analyzing surface roughness, growth, and contamination.
    • Understanding spectral sensitivity to contamination is vital for optical coating applications.