Size-dependent properties of small deposited chromium clusters by x-ray absorption spectroscopy

Abstract

Small, mass selected, deposited chromium clusters in the size range of 1--13 atoms per cluster have been investigated using x-ray absorption spectroscopy at the BESSY II storage ring at the chromium ${L}_{2,3}$ edges. The chromium clusters have been deposited on ultrathin iron films grown on a Cu(100) single crystal. A soft landing scheme and low temperatures have been used preventing the clusters from fragmenting and agglomerating, respectively. Spectroscopic parameters such as core level line shift, spin-orbit splitting, line shape, oscillator strength, and $L3∕L2$ branching ratio have been determined and are discussed in detail.