We have measured frequencies of all internal and external modes in natural and 32S isotopically pure oriented orthorhombic single sulfur crystals using high-resolution Raman and FTIR spectroscopy. Polarized spectra at low temperatures deliver mode frequencies and allow mode assignment to vibrational, librational, and translational character. Experimental data, such as temperature dependent frequencies at constant volume, are analyzed in terms of anharmonic processes. In addition, frequency shifts at the lowest temperature due to isotopic impurities are qualitatively explained by a relative mass defect.
Mode assignment of Sulphur α-S8 by polarized Raman and FTIR studies at low temperatures / M. BECUCCI; E. CASTELLUCCI; R. BINI; B. ECKERT; H. JODL. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - STAMPA. - 101:(1997), pp. 2132-2137. [10.1021/jp963029r]
Mode assignment of Sulphur α-S8 by polarized Raman and FTIR studies at low temperatures
BECUCCI, MAURIZIO;CASTELLUCCI, EMILIO MARIO;BINI, ROBERTO;
1997
Abstract
We have measured frequencies of all internal and external modes in natural and 32S isotopically pure oriented orthorhombic single sulfur crystals using high-resolution Raman and FTIR spectroscopy. Polarized spectra at low temperatures deliver mode frequencies and allow mode assignment to vibrational, librational, and translational character. Experimental data, such as temperature dependent frequencies at constant volume, are analyzed in terms of anharmonic processes. In addition, frequency shifts at the lowest temperature due to isotopic impurities are qualitatively explained by a relative mass defect.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.