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GB’s first scientific interest was for the theory of the vibrational and optical properties of point defects in crystals, which he developed in his thesis work. Relevant new results were: (a) the concepts of effective force constant, accounting for the long range forces in ionic crystals, and of local elastic constants; (b) the prediction of giant frequency shifts of defect resonances under pressure, a fact soon after proved experimentally at Cornell; (c) the theory of Raman scattering from colour centres with application to ordinary and Jahn-Teller defects.
In the seventies GB transferred the powerful Green’s function methods, first used for defective crystals, to the theory of surface phonons and inelastic atom surface scattering, predicting the feasibility of surface-phonon spectroscopy with inelastic atom scattering. In 1975, besides showing that van Hove singularities of surface phonon spectra can be detected already in angular distributions of helium scattering, he devised the theoretical tools for the analysis of the future time-of-flight (TOF) spectroscopy.
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NANOMATERIALSno. 23 (2023): 2997
Surface Science Reportsno. 2 (2022): 100552-100552
PHYSICAL CHEMISTRY CHEMICAL PHYSICSno. 13 (2021)
Bodil Holst,Gil Alexandrowicz,Nadav Avidor,Giorgio Benedek,Gianangelo Bracco,Wolfgang E. Ernst,Daniel Farias,Andrew P. Jardine,Kim Lefmann,Joseph R. Manson, Roberto Marquardt, Salvador Miret Artes,
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