EXAFS Experiments on Local Structure of NO Adsorbed on Supported Silver Clusters

TL;DR

This study uses in-situ EXAFS to analyze the local atomic structure of NO adsorbed on supported silver clusters, revealing slight structural changes upon adsorption and co-adsorption of NO and oxygen.

Contribution

It provides detailed local structural information of NO on silver clusters using a three-shell fitting model and difference file analysis, which is novel in this context.

Findings

Silver clusters undergo slight structural changes upon NO adsorption.

Co-adsorption of NO and oxygen allows separation of shell contributions.

EXAFS fitting reveals inter-atomic distances and coordination numbers.

Abstract

In-situ EXAFS experiments were performed at the Ag $K$-edge after adsorbing NO on the hydrogen reduced silver cluster. The coordination parameters, i.e. inter-atomic distance, coordination number and Debye-Waller factor were derived from a three-shell fitting model including a split Ag-Ag shell and a single Ag-O(N) shell. The multiple-shell fitting proved that the reduced silver cluster underwent a slight change in the local structure. After co-adsorbing NO and oxygen, the difference file fitting technique was used for isolating each of the first Ag-Ag(1) and Ag-O(N) shell contributions to the EXAFS spectra filtered in R-space of Fourier transform.