Ag L₃-Edge X-ray Absorption Near-Edge Structure of 4d¹⁰(Ag⁺) Compounds: Origin of the Edge Peak and Its Chemical Relevance

Abstract

A peak appearing at the L(2,3) X-ray absorption edge often provides the number of empty d states of the X-ray absorbing atoms. Ag(+) compounds have a d(10) state (no d empty states) but show a small peak at the edge. In this research, we systematically studied the edge peak of Ag(+) compounds to understand its origin on the basis of the molecular orbital picture and to obtain a relation of the edge peak intensity to chemical and physical quantities. The edge peak can be formally assigned to the transition from 2p to 5s enhanced by the s-d hybridization. The peak intensity has a negative correlation with a coordination charge but has a positive correlation with the strength of the covalent bond, which is in the reverse order to the other d(n) (n < 10) elements.

Photostability of gold nanoparticles with different shapes: the role of Ag clusters

“…Even this it is possible to analyze qualitatively the shape of the spectra in order to elucidate the state of Ag atoms in this system. The region just after the edge give information of the LUMO orbital of the Ag atoms and in the particular case of Ag L 3 are assigned to the transition from 2p to 5s enhanced by the s-d hybridization 45 . These resonances are related to the multiple scattering contribution of the atoms around Ag and its similarity to the Ag bulk reveals that the main contribution to the XANES spectra in this region is due to Ag atoms at distances similar to that of the Ag bulk.…”

Direct Observation of Charge Transfer in Solid Electrolyte for Electrochemical Metallization Memory

“…Since Ag metal has 4d 10 5s 1 electron configuration, it appears that the orbital state in Ag + ion should be 4d 10 5s 0 nominally. However, the hybridization effect of d and sp orbitals in the Ag + ion leaves the 4d states partially empty13 so that the Ag L 3 ‐edge XANES of Ag 2 O [Ag(I)] shows a pronounced d feature near the edge as shown by dashed line in Figure 1a (data taken from Reference14). The absence of such pronounced feature near hν = 3351 eV in the spectra of the GeS x /Ag samples, suggests that the Ag ions in GeS x should have an averaged valence less than 1, i.e.…”

SO2 promoted alkali metal doped Ag/Al2O3 catalysts for CH4-SCR of NOx

“…These results are well supporting the UV-Vis DRS findings. Small differences in intensity and in the position of continuum resonances are consequences of the small particle size of the aggregates and/or the interactions with the alumina support, which have been reported in many other supported-metal systems [34][35][36].…”