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- W2056568776 abstract "Photoinduced decomposition reaction of all-trans-β-carotene in the absence of oxygen was studied by 2D Raman correlation spectroscopy. Generalized two-dimensional correlation analysis, coupled with NIR-excited Raman scattering measurements, reveals the presence of both simultaneous and sequential changes of Raman intensities associated with the decomposing β-carotene and the creation of photoreaction products. The largest intensity increase occurs for the Raman band at 1537 cm-1, which is likely due to the formation of a photoisomerization product containing one or more cis CC groups. The formation of this product occurs at an earlier stage of the reaction than the steady decrease of band intensities associated with all-trans-β-carotene at 1522 and 1520 cm-1. Smaller intensity increases at 1133, 1569, and 1284 cm-1 occur synchronously with the growth of the 1537 cm-1 band and prior to the overall decrease in the all-trans-β-carotene bands. Thus, the decomposition product associated with the Raman bands at 1133, 1569, and 1284 cm-1 are either due to the same decomposition product as that represented by the 1537 cm-1 band, or different products formed at the same rate. The intensities of Raman bands at 1005 and 1000 cm-1 decrease in intensity, but this decrease lags behind that observed in the main 1520 and 1520 cm-1 all-trans-β-carotene bands. These bands may represent spectral contributions from different decomposition products overlapped with the dominant β-carotene contribution as well as a toluene solvent band." @default.
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- W2056568776 date "2002-01-19" @default.
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- W2056568776 title "Two-Dimensional Raman (2D Raman) Correlation Spectroscopy Study of Non-oxidative Photodegradation of <i>β</i>-Carotene" @default.
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- W2056568776 doi "https://doi.org/10.1021/jp0122528" @default.
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