Soft x-ray performance of high-resolution superconducting spectrometers

Area of Science:

• Physics
• Materials Science
• Astrophysics
• Biophysics

Background:

• Conventional X-ray detectors like Si(Li) and Ge(Li) have limitations in energy resolution.
• Superconducting microcalorimeters offer a promising alternative for high-precision X-ray spectroscopy.

Purpose of the Study:

• To develop and characterize high-resolution, broad-band superconducting X-ray spectrometers.
• To evaluate the performance of these spectrometers for X-ray energies relevant to materials science, astrophysics, and biophysics.

Main Methods:

• Fabrication of superconducting microcalorimeters using superconducting tunnel junction sensors.
• Utilizing thin films of niobium and aluminum for sensor construction.
• Characterizing detector performance via X-ray measurements from 70 eV to 500 eV.

Main Results:

• Achieved energy resolution ranging from 4 eV FWHM at 70 eV to 12 eV FWHM at 500 eV.
• Demonstrated energy resolution more than an order of magnitude better than state-of-the-art Si(Li) or Ge(Li) detectors.
• Validated the performance of superconducting X-ray spectrometers in the low-energy X-ray regime.

Conclusions:

• Superconducting X-ray spectrometers represent a significant advancement in X-ray detection technology.
• These spectrometers are well-suited for applications requiring exceptional energy resolution.
• The developed technology holds great potential for materials science, astrophysics, and biophysics research.