Fig. 2: Early stages of MS of noble metal clusters.
From: The emerging interface of mass spectrometry with materials

a Photoelectron spectra of Au20− cluster compared with C60− at 193 nm and 266 nm45. (Copyright© 2003 the American Association for the Advancement of Science) b Mass spectra obtained by laser desorption ionization of dodecanethiol thiol-protected gold clusters, (i) crude mixture of clusters and (ii–vi) separated fractions47. (Copyright© 1996 John Wiley and Sons)