Spin-polarized and site-selective X-ray absorption. Demonstration with Fe porphyrins and Kβ detection
✍ Scribed by Xin Wang; Clayton R. Randall; Gang Peng; Stephen P. Cramer
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 350 KB
- Volume
- 243
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
High-spin and low-spin Fe(III) porphyrins were studied by high resolution X-ray fluorescence and fluorescence-detected X-ray absorption spectroscopy using synchrotron radiation. The high-spin KI3 spectrum is split into a main peak (K~l,3) and a satellite (KI3') at 15 eV lower energy. The low-spin K~1,3 peak shifted = 0.7 eV to lower energy, and the K~' feature is almost unobservable. Ligand field multiplet calculations show that spin-up (5A 1) and spin-down (7A 1) states are separated for the high-spin spectrum. Spin polarization of the KI3-detected absorption was demonstrated by enhancement or elimination of the ls ~ 3d transition, depending on the KI3 region used for detection.