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Updated: May 6, 2026

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
High-resolution molybdenum K-edge X-ray absorption spectroscopy analyzed with time-dependent density functional
Frederico A Lima1, Ragnar Bjornsson, Thomas Weyhermüller
1Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D- 45470, Mülheim an der Ruhr, Germany. serena.debeer@cec.mpg.de.
High-energy resolution fluorescence detected X-ray absorption spectroscopy (HERFD-XAS) sharpens spectral features for heavy elements. This study calibrates computational methods for accurate molybdenum K-edge HERFD-XAS analysis.
Area of Science:
- Spectroscopy
- Computational Chemistry
- Materials Science
Background:
- X-ray absorption spectroscopy (XAS) probes local atomic structure.
- Quantitative XAS interpretation is difficult for heavy elements due to spectral broadening.
- High-energy resolution fluorescence detected XAS (HERFD-XAS) offers sharper spectral features.
Purpose of the Study:
- To investigate molybdenum complexes using HERFD-XAS.
- To calibrate time-dependent density functional theory (TDDFT) for molybdenum K-edge HERFD-XAS.
- To assess the impact of different functionals and relativistic approximations.
Main Methods:
- High-energy resolution fluorescence detected X-ray absorption spectroscopy (HERFD-XAS).
- Time-dependent density functional theory (TDDFT) calculations.
- Inclusion of scalar relativistic approximations (ZORA, DKH2).
Main Results:
- HERFD-XAS provided sharper spectral features, enabling clear pre-edge analysis.
- TDDFT calculations showed excellent agreement with experimental molybdenum K-edge HERFD-XAS spectra.
- Accuracy was maintained regardless of the functional or relativistic model used.
Conclusions:
- This work provides a crucial calibration for molybdenum K-edge HERFD-XAS.
- The validated TDDFT approach can be applied to complex molybdenum-containing catalytic systems.
- Accurate theoretical predictions are achievable for HERFD-XAS of heavy elements.
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