2017年8月15日 · Metal K-edge absorption occurs when the metal 1s electron is excited either into a valence orbital or into a continuum state. Generally, the XAS spectrum is divided into two regions, each of which involves different transitions and contains complementary information.

当原子吸收X射线光子后,某芯电子被激发,向位于较高能量的被允许未占据轨道跃迁,乃至脱离原子的束缚,向连续空态跃迁。 边前(pre-edge):有许多分立的峰,源于由芯电子向束缚空态跃迁。 边(edge):电离,向连续空轨道跃迁。 边后(post-edge):散射的叠加。 初态决定吸收边(K,L x,M x等),终态是激发态(困难的由来)。 复杂的终态:原子轨道(态)的相互作用,杂化!(分子轨道和晶体场理论,多重散射理论和能带理论等);激发态! XANES 谱分析的关键:终态!包括什么态才是可以允许跃迁的( …

Peak-fits of C (1s) in polymers include an asymmetric tail when the energy resolution is very high. Binding energy shifts of some compounds are negative due to unusual electron polarization.

2008年9月17日 · The characteristics of pre-edge peaks in K-edge x-ray absorption near edge structure (XANES) spectra of 3d transition metals were reviewed from viewpoints of the selection rule, coordination number, number of d-electrons, and symmetry of the coordination sphere.

F environment while the corresponding N 1s, O 1s and F 1s peaks were observed at 400.0 ±0.1eV, 533.4 ±0.1eV and 688.1±0.1eV, respectively. For KTFSI, the O 1s, N 1s and S 2p XPS core spectra showed peaks, attributed to NSO envi- ronment, at 533.4 ±0.1 eV, 400.2 ±0.1 eV and 169.8 ±0.1eV,

For the analysis of photoelectron spectra of relatively pure iron oxides, one can use peak shape and peak binding energy comparisons to standard compounds to derive oxide composition.

2012年1月15日 · In this work we report a core level XPS study of K 2 O–SiO 2 glasses, emphasizing the O 1s, Si 2p and K 2p spectral lines. The XPS data provide evidence for two types of BO atoms and the presence of O 2−; an oxygen atom not bonded to a silicon atom.

These reference pages contain tips and techniques that are designed to help both the novice and advanced XPS user. K 2p3/2 binding energies. K 2p3/2-1/2 splitting is 2.77 to 2.8 eV. Notes: Often will see K 2p peaks in high resolution C 1s spectra.

This review gives an overview of the application of metal K-edge and L-edge X-ray absorption spectroscopy (XAS), as well as K resonant inelastic X-ray scattering (RIXS), to the study of electronic structure in transition metal sites with emphasis on …

Rechargeable potassium-metal batteries (PMBs) meet the need for high energy density because the potassium (K) metal anode has the highest specific capacity (687 mA h g⁻¹) among anode materials ...