Cricenti, A.Generosi, R.Luce, M.Perfetti, P.Margaritondo, G.Talley, D.Sanghera, J. S.Aggarwal, I. D.Gilligan, J. M.Tolk, N. H.2006-10-032006-10-032006-10-03200110.1046/j.1365-2818.2001.00874.xhttps://infoscience.epfl.ch/handle/20.500.14299/234856WOS:0001683791000281623Hydrogen chemistry in thin films and biological systems is one of the most difficult experimental problems in today's science and technology We successfully tested a novel solution, based on the spectroscopic version of scanning near-field optical microscopy (SNOM). The tunable infrared radiation of the Vanderbilt free electron laser enabled us to reveal clearly hydrogen-decorated grain boundaries on nominally hydrogen-free diamond films. The images were obtained by SNOM detection of reflected 3.5 mum photons, corresponding to the C-H stretch absorption, and reached a lateral resolution of 0.2 mum, well below the lambda /2 (lambda = wavelength) limit of classical microscopy.diamondfree electron laser (FEL)scanning near-field opticalmicroscopy (SNOM)PHOTOEMISSIONSEMICONDUCTORtext::journal::journal article::research article