Wavelength dependent resonance Raman band intensity of broadband stimulated Raman spectroscopy of malachite green in ethanol

2015 ◽  
Vol 142 (11) ◽  
pp. 114201 ◽  
Keyword(s):  
Raman Spectroscopy ◽  
Malachite Green ◽  
Raman Band ◽  
Resonance Raman ◽  
Band Intensity ◽  
Stimulated Raman

Stimulated Raman spectroscopy of malachite green isothiocyante

2013 ◽  
Vol 43 (12) ◽  
pp. 1831-1838
Author(s):  
Mei XU ◽  
ZhaoHui WANG ◽  
YuHan HE ◽  
GuiQin CHEN
Keyword(s):  
Raman Spectroscopy ◽  
Malachite Green ◽  
Stimulated Raman

Time-gated pre-resonant femtosecond stimulated Raman spectroscopy of diethylthiatricarbocyanine iodide

2014 ◽  
Vol 16 (11) ◽  
pp. 5312-5318 ◽  
Author(s):  
Hyung Min Kim ◽  
Hyunmin Kim ◽  
Ilseung Yang ◽  
Seung Min Jin ◽  
Yung Doug Suh
Keyword(s):  
Raman Spectroscopy ◽  
Resonance Raman ◽  
Stimulated Raman

We present time-gated femtosecond stimulated Raman spectroscopy (fSRS) under the pre-resonance Raman conditions of diethylthiatricarbocyanine (DTTC) iodide.

Raman Spectra of Haloaluminate Melts Containing Oxides

1989 ◽  
Vol 43 (2) ◽  
pp. 336-341 ◽  
Author(s):  
B. P. Gilbert ◽  
R. W. Berg ◽  
N. J. Bjerrum
Keyword(s):  
Raman Spectroscopy ◽  
Melting Point ◽  
Visible Light ◽  
Raman Spectra ◽  
Raman Band ◽  
Band Intensity ◽  
Metallic Aluminum ◽  
Fused Quartz ◽  
Polarized Raman

Raman spectroscopy measurements on haloaluminate melts (bromides and chlorides), with or without addition of the corresponding aluminum oxohalide, have unequivocally shown that even the most carefully cleaned melts exhibit a polarized Raman band, due to the presence of aluminum oxohalide complexes. The frequency of this characteristic oxide Raman band is ∼280–270 cm−1 for the chloride and ∼185 cm−1 for the bromide system, respectively. Hence, being halide dependent, the observed band cannot be assigned entirely to Al-O vibrations within the skeleton of the aluminum oxohalide species but must also involve some movement of the halide atoms. At temperatures just above the melting point, studies of the oxide band intensity vs. time showed that molten AlCl3 and AlBr3 attack Pyrex® glass, fused quartz, and sapphire containers, causing dissolution of oxides; within few hours, the melts become almost saturated. Finally, it has been found that acidic chloroaluminate melts, which invariably tend to fluoresce when illuminated with visible light contained in a glass or silicate container, owe their fluorescing properties to a reaction between the container and the AlCl3. This troublesome fluorescence can be quenched by addition to the melt of a reductant such as metallic aluminum.

Effect of pH on lignin analysis by Raman spectroscopy

Holzforschung ◽  
2012 ◽  
Vol 66 (4) ◽  
Author(s):  
Elina Warsta ◽  
Anni Lähdetie ◽  
Anna-Stiina Jääskeläinen ◽  
Tapani Vuorinen
Keyword(s):  
Raman Spectroscopy ◽  
Model Compound ◽  
Lignin Content ◽  
Raman Band ◽  
Band Intensity ◽  
Hydroxyl Groups ◽  
Model Compounds ◽  
Band Shift ◽  
Lignin Model ◽  
Ultraviolet Resonance Raman

Abstract Ultraviolet resonance Raman (UVRR) spectroscopy is a powerful tool for structural lignin analysis in situ: modification or isolation of lignin from biomass is not necessary. UVRR spectroscopy is equally applicable for samples with high lignin content and those with very low lignin content. Monomeric phenolic lignin model compounds and wood pulp samples have been studied at neutral and alkaline pH with UVRR spectroscopy. Concentration of guaiacol correlated well with the relative Raman band intensity, which indicates that lignin-containing solutions can be quantitatively measured with UVRR spectroscopy. A change in pH induced a recordable shift in the aromatic band position in the spectra, which was 25–35 cm-1 with phenolic model compounds without para substitution, 8–12 cm-1 with phenolic model compounds with para substitution, and about 2–7 cm-1 with pulp samples. No shift was detected with a non-phenolic model compound. Increasing the amount of phenolic hydroxyl groups increased the UVRR band shift in pulp samples. Additionally, increasing the pH enhanced the relative aromatic band intensity in the UVRR spectra in solution of the phenolic model compound. Accordingly, pH adjustment is relevant prior to any lignin analysis with Raman spectroscopy.

A POWERFUL TOOL TO STUDY COLLISIONAL PHENOMENA AND FOR COMBUSTION APPLICATIONS : THE HIGH RESOLUTION STIMULATED RAMAN SPECTROSCOPY

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-761-C7-762
Author(s):  
B. LAVOREL ◽  
G. MILLOT ◽  
R. SAINT-LOUP ◽  
M. L. GONZE ◽  
J. SANTOS ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Stimulated Raman
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