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Related Experiment Video

Updated: Jun 16, 2026

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
09:53

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

Published on: October 30, 2012

Rotating beam splitter for the extreme vacuum ultraviolet.

W Gudat, C Kunz, J Karlau

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

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    A novel rotating-mirror beam splitter enables direct measurement of thin film transmissivity and differential transmissivity with high sensitivity. This instrument effectively eliminates intensity fluctuations from electron accelerators.

    Area of Science:

    • Materials Science
    • Optics
    • Photonics

    Background:

    • Characterizing thin film properties is crucial for optical and electronic device development.
    • Photon energy-dependent measurements require stable and precise light sources.
    • Existing methods for measuring transmissivity can be affected by source intensity fluctuations.

    Purpose of the Study:

    • To develop and demonstrate a rotating-mirror beam splitter for precise thin film transmissivity measurements.
    • To achieve efficient elimination of intensity fluctuations from electron accelerator light sources.
    • To enable sensitive measurements of differential transmissivity (ΔT/T).

    Main Methods:

    • Construction of a rotating-mirror beam splitter operating at grazing incidence.
    • Utilizing the instrument to measure thin film transmissivity in the 20-280 eV photon energy range.

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  • Incorporating a deflecting mirror as a photocathode in an open electron multiplier for beam monitoring.

    • Main Results:

    • Direct measurement of thin film transmissivity with minor corrections.
    • Efficient suppression of intensity fluctuations from electron accelerators.
    • Achieved a sensitivity of a few tenths of a percent for differential transmissivity measurements.
    • Demonstrated a highly effective beam monitor against intensity fluctuations.

    Conclusions:

    • The developed rotating-mirror beam splitter is a robust tool for accurate thin film characterization.
    • The instrument's ability to mitigate intensity fluctuations enhances measurement reliability.
    • The system offers high sensitivity for detecting subtle changes in transmissivity.