Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/277833
Type: TESE
Title: Espectroscopia Raman em compostos KBr-Br2, KI-Br2 e do HOPG-Br2
Author: Pedreira, Vanda do Amaral V
Advisor: Gualberto, Gilberto de Matos, 1942-
Abstract: Resumo: Os cristais iônicos KBr e KI não apresentam atividade Raman. Espectros Raman destes cristais, após imersão em bromo líquido, exibiram linhas com freqüências identificadas como sendo devida aos compostos KBr3 e IBr, ao Br2 e às formas alotrópicas 79Br -79Br. 79Br -81Br e 81Br -81Br e aos íons Br3- e Br5-. -Espectros Raman do grafite pirolítico altamente orientado (HOPG) intercalados com Br2 foram estudados. O estágio encontrado foi n=2, evidenciado pelo pico intenso em w = 244 cm-1 e pelos seus harmônicos 2w0 ,3w0 ,4w0 ... . Estruturas menores foram observadas na região espectral dominada pelo bromo sólido

Abstract: The ionics crystals KBr and KI do not present Raman activity. Raman spectra of these crystals after immersing in liquid bromine exhibits lines with frequencies identified as been due to the compounds KBr3 and IBr, to the alotrophics forms 79Br - 79Br, 79Br- 81Br and 81Br - 81Br and to the ions Br3- and Br5-. -Raman spectra of highly oriented pyrolitic graphite (HOPG) intercalated with Br2 were also investigated. The stage number found was n=2, evidenced by the intense peak in w0 = 244 cm-1 and by its harmonics 2w0, 3w0, ... . Minor structures were also observed in the spectral region dominated by the solid bromine
Subject: Espectroscopia Raman
Language: Português
Editor: [s.n.]
Date Issue: 1996
Appears in Collections:IFGW - Dissertação e Tese

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