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Multilayer mirror for x rays below 190 eV.

C Michaelsen, J Wiesmann, R Bormann

    Optics Letters
    |November 28, 2007
    PubMed
    Summary
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    Lanthanum/Boron carbide (La/B(4)C) multilayers show improved performance as x-ray mirrors below 190 eV. These new mirrors offer higher reflectivity and spectral purity, potentially replacing current molybdenum/boron carbide (Mo/B(4)C) mirrors.

    Area of Science:

    • Materials Science
    • Optics
    • X-ray Physics

    Background:

    • Multilayer x-ray mirrors are crucial for applications below 190 eV.
    • Molybdenum/Boron carbide (Mo/B(4)C) multilayers are the current standard for this energy range.
    • Detection of boron K and alpha x rays at 183 eV requires high-performance optics.

    Purpose of the Study:

    • To fabricate and evaluate Lanthanum/Boron carbide (La/B(4)C) multilayers.
    • To compare the performance of La/B(4)C mirrors with existing Mo/B(4)C mirrors.
    • To assess the potential of La/B(4)C for x-ray optical applications.

    Main Methods:

    • Magnetron sputtering was used for multilayer fabrication.
    • Transmission electron microscopy (TEM) analyzed structural quality.

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  • Synchrotron soft-x-ray reflectometry measured mirror performance.

    • Main Results:

    • La/B(4)C multilayers demonstrated significantly improved peak reflectivity.
    • Enhanced spectral purity was observed in La/B(4)C mirrors.
    • The structural quality of La/B(4)C was suitable for x-ray optics.

    Conclusions:

    • La/B(4)C multilayers show high potential to replace Mo/B(4)C.
    • These new mirrors are promising for x-ray detection applications below 190 eV.
    • Further applications in x-ray optics are anticipated for La/B(4)C.