Metal L-edge spectroscopy is a spectroscopic technique used to study the electronic structures of transition metal atoms and complexes. This method measures X-ray absorption caused by the excitation of a metal 2p electron to unfilled d orbitals (e.g. 3d for first-row transition metals), which creates a characteristic absorption peak called the ...

Feb 26, 2010 · Herein, we utilize Fe L-edge X-ray absorption spectroscopy to determine the differential orbital covalency (i.e., the differences in the mixing of the metal d-orbitals with ligand valence orbitals) of a series of siderophore model compounds.

Jul 22, 2006 · The analysis of L-edge spectral shape, energy shift, and total intensity demonstrates that Fe L-edge X-ray absorption spectroscopy provides a direct probe of metal-to-ligand back-bonding.

Aug 15, 2017 · The L-edge spectrum of Fe–O 2 pfp shows an absence of a hole in the dπ orbital of the Fe, indicating a strong π interaction between the Fe and O 2, limiting the extent of spin-polarization in the Fe–O 2 bond.

... par- ticular, X-ray absorption near edge structure (XANES) spectra of the Fe L-edge and the O K-edge have been analyzed using total electron yield (TEY) and total fluorescence yield (TFY)...

Mar 3, 2010 · Here, we study Fe L-edge XAS spectra of a series of high spin compounds where the ligand field splitting is smaller than the electron-electron repulsion. This leads to a greater mixing of states distributing the σ and π covalencies over the multiplets constituting the L …

Apr 1, 2013 · In L edge X-ray absorption, a 2p core electron is excited to an empty state. The binding energy of the 2p core state of iron is approximately 710 eV. This implies that L edge XAS spectra are excited with 710 eV soft X-rays using one of the soft X …

Jan 1, 2007 · In this study we have applied Fe L-edge x-ray absorption spectroscopy at the L 3 and L 2 edges to directly probe the Fe d-orbitals of heme complexes and quantify the σ and π donor as well as π acceptor contributions to bonding.

Some of the important theoretical concepts in the analysis of L edges are discussed, including atomic multiplet theory, crystal field theory, charge transfer theory and XMCD. The 2p XAS spectra contain much detail for halides, oxides and coordination compounds.

Dec 7, 2006 · Recently, we have developed a methodology that allows for the interpretation of the multiplet structure of Fe L-edges in terms of differential orbital covalency (i.e., differences in mixing of the d-orbitals with ligand orbitals) using a valence bond …