Near-infrared combination and overtone bands of CH in CHX3, CHX(2)-CHX2, and CHX(2)-CX(2)-CHX2
| Autor: | Akishi Nara, Toshihiko Matsuda, Reikichi Iwamoto |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Spectrophotometry
Infrared Chemistry Infrared Polymers Overtone 010401 analytical chemistry Near-infrared spectroscopy Analytical chemistry Hydrogen Bonding 01 natural sciences Carbon 0104 chemical sciences 010309 optics symbols.namesake Computational chemistry Excited state 0103 physical sciences Halogen symbols Raman spectroscopy Spectroscopy Instrumentation Near infrared radiation Hydrogen |
| Zdroj: | Applied spectroscopy. 59(11) |
| ISSN: | 0003-7028 |
| Popis: | In the present report we studied spectral characteristics of the near-infrared combination and overtone bands of CH vibrations of a CH sequence. The near-infrared bands of the CH in CHX3 (X, halogen), which were interpreted in terms of the CH stretching and CH deformation fundamentals without any ambiguity, typically showed how the frequency and intensity of a combination or an overtone depend on the vibrational excited state. In the CH–C–CH of CHX2CX2CHX2, the vibrations of one CH are isolated from those of the other CH, and the combination and overtone bands were similarly interpreted as those of the CH, although each of the combination bands was split into two because of non-degeneracy of the CH deformation. In the CH–CH of CHX2CHX2, the CH deformations only have coupled modes. The first combination showed four narrowly separate bands, which were reasonably interpreted on the basis of the CH stretching and the coupled CH deformation modes. We demonstrated that the first combination of coupled modes as well as the combination of up to, at least, the third order of isolated modes have the nature of the characteristic bands. |
| Databáze: | OpenAIRE |
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