The foregoing results have shown that the GNPs studied experimentally are well described by the theoretical results for uncoated particles. This is understandable, since the GNPs studied here are protected with citrate and/or hydroxylamine. These molecules are small, and it has been shown that citrate adsorbs flat lying on Au(111),23 which results in a thickness of the protecting layer of merely a few tenths of a nanometer, and hence the GNPs can be described as uncoated in good approximation