Fig. 4: The optical absorption spectra for cationic cobalt clusters.
From: Direct probing of low-energy intra d-band transitions in gas-phase cobalt clusters
a Optical absorption spectra for Con+Krm (n = 4–15), with a 10-point running average (red). Arrows indicate the estimated onsets of optical absorption increase. b Optical HOMO-LUMO gaps as a function of n, extracted from the experiment (circles) and TD-DFT calculations (squares). The dashed red line is a fit to a 1/n functional form. Error bars are estimated based on the signal-to-noise ratio of the data for each cluster.
