1993
DOI: 10.1255/jnirs.2
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Short-Wave near Infrared Spectra of Organic Liquids

Abstract: Multi-quanta vibrational transitions are discussed in terms of the local mode model in order to develop a better understanding of the features observed in the short-wave near infrared (700-1100 nm) spectra of organic liquids.It is demonstrated that the spectra of simple alkanes and alcohols exhibit local mode features, and that these features are characteristic of molecular structure and will, therefore, be useful for quantitative and qualitative analysis.

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Cited by 22 publications
(7 citation statements)
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“…20 The Ðrst overtones of the OH stretching bands due to the free (D7100 cm~1) and associated (6200È6900 cm~1) species are heavily overlapped by the CH combination bands [2l(CH) ] d(CH)] at 7183 and 6980 cm~1 [ Fig. 26 The corresponding overtones of the associated species are too weak to be observed. 24,25 As expected, the intensity of the monomer band increases, whereas that of the polymer band (D6200 cm~1) decreases with increase in temperature.…”
Section: Resultsmentioning
confidence: 99%
“…20 The Ðrst overtones of the OH stretching bands due to the free (D7100 cm~1) and associated (6200È6900 cm~1) species are heavily overlapped by the CH combination bands [2l(CH) ] d(CH)] at 7183 and 6980 cm~1 [ Fig. 26 The corresponding overtones of the associated species are too weak to be observed. 24,25 As expected, the intensity of the monomer band increases, whereas that of the polymer band (D6200 cm~1) decreases with increase in temperature.…”
Section: Resultsmentioning
confidence: 99%
“…10 The second overtone of the monomer band at 10 383 cm 2 1 is surrounded by the third overtone of the CH stretching vibrations (4n(CH)) at 10 757 cm 2 1 and the CH combination bands (3n(CH)1d(CH)) near 9630 cm 2 1 . 5,11 As can be seen, the intensity of the second overtone of the m onomer band strongly increases with an increase in temperature, whereas the third overtone of the CH band does not vary in its intensity. A slight enhancement in intensity of the CH combination bands, not yet as strong as that for the monomer band, suggests that these spectral features are overlapped by another one, associated with the OH stretching vibrations.…”
Section: Experimental and Data Treatm Entmentioning
confidence: 87%
“…5 to previously reported loss spectra of methanol in Te¯ont-AF-based LCOFs, 36 it can be seen that the 2835 cm 2 1 (1010 nm) and 2942 cm 2 1 (1021 nm) Raman C±H stretching peaks which are least enhanced in the LCOF coincide with the peak of an``intense' ' loss feature that can most likely be assigned as a C±H overtone combination band. 51 Similarly the 1450 cm 2 1 (866 nm) Raman CH 3 bend peak is located at the edge of a weaker absorption feature that can probably be assigned as a third-overtone C±H stretching band. 51 The 1033 cm 2 1 (854 nm) Raman CCO stretch peak that experiences greatest enhancement in the LCOF overlaps with the signi® cantly weaker tail of the same third-overtone C±H band.…”
Section: Resultsmentioning
confidence: 96%
“…51 Similarly the 1450 cm 2 1 (866 nm) Raman CH 3 bend peak is located at the edge of a weaker absorption feature that can probably be assigned as a third-overtone C±H stretching band. 51 The 1033 cm 2 1 (854 nm) Raman CCO stretch peak that experiences greatest enhancement in the LCOF overlaps with the signi® cantly weaker tail of the same third-overtone C±H band. By analogy with these results it can be assumed that the broad, intense second-overtone OH absorption band centered near 977 nm in water 52 (Raman shift of approximately 2500 cm 2 1 with 785 nm excitation) will m ore effectively attenuate Raman light in aqueous solutions and potentially render LCOFs less bene® cial in this region.…”
Section: Resultsmentioning
confidence: 96%