A zone-plate-based two-color spectrometer for indirect X-ray absorption spectroscopy

Area of Science:

• Materials Science
• Atomic and Molecular Physics
• Spectroscopy

Background:

• X-ray absorption spectroscopy (XAS) is vital for analyzing material properties.
• Conventional XAS methods often rely on indirect measurements.
• Developing efficient and accurate XAS techniques is crucial for materials research.

Purpose of the Study:

• To demonstrate a new XAS implementation utilizing off-axis transmission Fresnel zone plates.
• To obtain X-ray absorption (XA) spectra of La_0.6Sr_0.4MnO₃.
• To evaluate the accuracy and efficiency of this novel XAS approach.

Main Methods:

• Utilized off-axis transmission Fresnel zone plates for XAS.
• Simultaneously analyzed O 2p-1s, Mn 3s-2p, and Mn 3d-2p emission lines.
• Measured total fluorescence yield, partial fluorescence yields (PFY), and inverse partial fluorescence yield (IPFY).

Main Results:

• The new XAS scheme accurately measures XA spectra of La_0.6Sr_0.4MnO₃.
• Mn 3s PFY and IPFY showed minimal deviation from true XA spectra.
• Achieved higher efficiency and signal-to-noise ratio compared to conventional methods.

Conclusions:

• The demonstrated XAS method offers improved efficiency and accuracy.
• This technique is suitable for in situ spectroscopy of complex materials.
• The use of Fresnel zone plates enhances XAS capabilities for materials characterization.