The distribution of intensity in the Raman spectrum of diamond

Abstract

From microphotometric studies of the Raman spectrum of diamond, the distribution of intensity in it has been derived. The spectra themselves exhibit much observable fine structure, including several sharply-defined and intense lines. The intensity curve also exhibits steep drops to zero near the frequency shifts 2176 and 2665 cm^-1. These facts are discussed and it is shown that the features mentioned, as also the appearance of second-order Raman spectra generally with crystals, are irreconcilable with the Born-Karman theory of lattice vibrations.