A methodology for calibrating wavelength dependent spectral resolution for crystal spectrometers

Area of Science:

• Physics
• Spectroscopy
• Materials Science

Background:

• High-quality soft x-ray absorption spectroscopy requires precise spectral resolution.
• Interpreting data from facilities like Sandia National Laboratories Z requires detailed spectral knowledge.

Purpose of the Study:

• To present a methodology for measuring wavelength-dependent crystal spectral resolution.
• To apply this method to a potassium acid phthalate (KAP) crystal spectrometer in the 7-17 Å range.

Main Methods:

• Developed a calibration procedure for crystal spectrometers.
• Utilized a KAP crystal spectrometer in 2nd order to resolve x-ray source line profiles (Si, Al, Mg Kα).
• Applied resolved source profiles to determine 1st order KAP spectral resolution.

Main Results:

• Successfully measured the wavelength-dependent spectral resolution of a KAP crystal spectrometer.
• Achieved resolving powers (λ/Δλ) of approximately 1100-1300 in the 7-10 Å wavelength range.
• Characterized Si, Al, and Mg Kα line profiles with high resolution.

Conclusions:

• The presented methodology enables accurate determination of crystal spectrometer resolution.
• This work provides essential calibration data for soft x-ray spectroscopy experiments.
• Improved spectral resolution measurements enhance the interpretation of complex x-ray spectra.