Low-frequency Raman spectroscopy

Okajima, H., and Hamaguchi, H., Low frequency Raman spectroscopy and liquid structure of imidazolium based ionic liquids. Abstracts of Papers, 231st ACS National Meeting, Atlanta, U.S., March 26-30, 2006, lEC-015. American Chemical Society, Washington, D.C., 2006. 

Low-frequency Raman spectroscopy (LFRS) has been used to measure the longitudinal acoustic mode (LAM) of semicrystalline diblocks containing poly(ethylene oxide) (Mai et at. 1996 Viras et at. 1988 Yang et at. 1995), The LAM mode frequency is inversely proportional to the crystal stem length, and indicates whether chains are folded or extended. 

Y. Suzuki, N. Suzuki, Y. Takasu, and I. Nishio, A study on the structure of water in an aqueous solution by solvent effect on a volume phase transition of N-isopropylacrylamide gel and low-frequency Raman spectroscopy, J. Chem. Phys. 107(15), 5890-5897 (1997). 

The earliest and simplest nonresonant technique for studying intermolecular dynamics was spontaneous low-frequency Raman spectroscopy (also known as Rayleigh-wing spectroscopy) (8). In its most basic implementation, a reasonably powerful monochromatic laser beam travels through... 

While a large number of coherent, time-domain, low-frequency Raman spectroscopies have been developed (15-18), they all fall under the general category of optical Kerr effect (OKE) spectroscopy (19,20). The Kerr effect is a phenomenon that occurs when a polar liquid is subjected... 

Femtosecond optical heterodyn-detected optical Kerr effect spectroscopy and low-frequency Raman spectroscopy were used to study the molecular dynamics of selenophene <1998JCP10948>. Femtosecond Kerr effect spectroscopy was also used to examine the third-order polarizabilities of furan, thiophene, and selenophene, which was found to increase from furan to thiophene to selenophene <1996CPL(263)215>. 

LOW-FREQUENCY RAMAN SPECTROSCOPY OF PLASTICALLY DEFORMED POLYMETHYL METHACRYLATE... 

So it is clear that, for our purposes, we have to study the low frequency part of the vibrational spectrum, which can be carried out in principle by far infrared or low frequency Raman spectroscopy. 

Dieguez A, Romano-Rodriguez A, Morante JR, Barsan N, Weimar U, Gopel W (1997) Nondestmctive assessment of the grain size distribution of SnO nanoparticles by low-frequency Raman spectroscopy. Appl Phys Lett 71(14) 1957-1959... 

The methodology of Raman spectroscopy is rapidly becoming matured. Here, we describe two classes of new Raman spectroscopies, Raman microspectroscopy and low-frequency Raman spectroscopy, that are considered to be important for future applications to ionic liquid studies. 

Low-Frequency Raman Spectroscopy and Biomolecular Dynamics A Comparison Between Different Low-Frequency Experimental Techniques. Collectivity of Vibrational Modes... 

Size Determination of Nanocrystallites by Low-Frequency Raman Spectroscopy Because of the strong dependence of the optoelectronic properties of nanocrystalline samples on the size, the determination of the crystallite sizes is a crucial point in the char-... 

Low-frequency Raman spectroscopy by ordinary cw laser excitation can, in many cases, give the same information on liquids as is obtained by modern femtosecond pulse laser techniques like THz spectroscopy or OHD-RIKES. However, the spectral representations obtained by the three techniques are different, and in order to compare the results, it is very important to choose the correct spectral representation. Fortunately, it is very easy to go from one spectral representation to another by very simple calculations. Even in cases where only the low-frequency Raman spectrum is considered, it is an advantage to use a reduced intensity representation, because the intensity of the Rayleigh line is diminished. 

O Faurskov Nielsen. Hydrogen bonding in liquid amides studied by low-frequency Raman spectroscopy. J Mol Struct 175 251-256, 1988. 

SEM Colaianni, O Faurskov Nielsen. Low-frequency Raman spectroscopy. J. Mol Struct 347 267-284, 1995. 

The structure of the CuNO ionic pair in acetone was investigated by Castro and Jagodzinski [262] using far-infrared and low-frequency Raman spectroscopy and normal coordinate analysis. Three possible structures (C monodentate, C2V monodentate, and C2V bidentate) were studied theoretically. The result obtained for the Civ bidentate structure fits the observed frequencies much better, with an average error of 4 cm , further providing an accurate reproduction of the N isotopic shifts. Two ill-resolved bands observed in the low-frequency Raman spectrum are assigned to the Cu—O2 symmetric (330 cm ) and antisymmetric (347 cm ) stretching. 

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