Transition Radiation as a Secondary Standard Source in the VUV

Area of Science:

• Physics
• Materials Science
• Spectroscopy

Background:

• Optical radiation from electron-metal interactions is crucial for various scientific applications.
• Developing reliable secondary standard sources in the vacuum ultraviolet (VUV) region is essential for accurate measurements.
• Metallic surfaces under electron bombardment can emit VUV radiation.

Purpose of the Study:

• To investigate the potential of electron-bombarded metallic surfaces as a secondary standard source in the VUV spectral region.
• To evaluate the suitability of high-purity aluminum as a target material for VUV radiation generation.
• To determine the reproducibility and absolute intensity of the generated VUV radiation.

Main Methods:

• Electron bombardment of high-purity aluminum target.
• Characterization of emitted optical radiation in the VUV spectrum.
• Absolute calibration using a deuterium lamp with known intensity.

Main Results:

• High-purity aluminum was identified as a suitable target material.
• Reproducibility of the VUV radiation was found to be 4% (0.11-0.15 µm) and 2% (0.15-0.27 µm).
• Absolute intensity calibration was achieved in the 0.17-0.27 µm region.

Conclusions:

• Electron-bombarded aluminum is a viable secondary standard source for VUV radiation.
• The developed source demonstrates good reproducibility for VUV measurements.
• This method provides a practical approach for VUV spectral calibration.