Resonance Raman scattering of the radial breathing mode in single wall carbon nanotubes AIP Conf.The first-and second-order Raman phonon spectra of CsPbCl 3 were measured in phase IV using Raman and resonance-Raman scattering. Twelve Raman active phonons were resolved at 32, 35.5, 42, 52, 72, 90, 110, 115, 121, 189, 200.5, and 375 cm Ϫ1 and correlated to the phonon spectrum of CsPbCl 3 in phase I. The highest frequency longitudinal optical mode is 375 cm Ϫ1 .

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