Global Vibrational Modes in Proteins: Raman Spectroscopy and Numerical Modeling

2017 ◽  
pp. 15-18
Author(s):  
Alberto Carpinteri ◽  
Giuseppe Lacidogna ◽  
Andrea Bassani ◽  
Gianfranco Piana
Keyword(s):  
Raman Spectroscopy ◽  
Numerical Modeling ◽  
Vibrational Modes

Identification of Vibrational Modes in BaSi2 Epitaxial Films by Infrared and Raman Spectroscopy

2018 ◽  
Vol 386 ◽  
pp. 43-47 ◽  
Author(s):  
Hirofumi Hoshida ◽  
Naoki Murakoso ◽  
Takashi Suemasu ◽  
Yoshikazu Terai
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Epitaxial Films ◽  
Ir Absorption ◽  
Vibrational Modes ◽  
Depolarization Ratio ◽  
Phonon Line ◽  
Infrared And Raman Spectroscopy ◽  
Raman Intensities ◽  
Polarized Raman

Infrared (IR) absorption and polarized Raman spectra were measured in BaSi2 epitaxial films to investigate the vibrational modes and the symmetry of Si4 cluster in BaSi2. By an analysis based on Raman and/or IR activity in the spectra, the symmetry of Si4 cluster was determined as Th-symmetry and the observed Raman lines and IR peaks were assigned to Ag, Eg, Fg, and Fu, respectively. In the three Raman lines of Fg-mode, one LO phonon line and two TO phonon lines were classified by the depolarization ratio of polarized Raman intensities.

scholarly journals Raman Spectroscopy Analysis of Free Fatty Acid in Olive Oil

2019 ◽  
Vol 9 (21) ◽  
pp. 4510
Author(s):  
Jin Qiu ◽  
Hua-Yi Hou ◽  
In-Sang Yang ◽  
Xiang-Bai Chen
Keyword(s):  
Raman Spectroscopy ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Olive Oil ◽  
Relative Intensity ◽  
Intensity Ratio ◽  
Green Laser ◽  
Critical Parameters ◽  
Vibrational Modes ◽  
Relative Intensity Ratio

Free fatty acid (FFA) is one of the most critical parameters for evaluating the quality of olive oil. In this paper, we present a simple and rapid Raman spectroscopy method for analyzing free fatty acid in olive oil. First, FFA degradation of carotenoids in olive oil is confirmed by analyzing the relative intensity of characteristic vibrational modes and introducing an intensity decrease factor. Second, it is demonstrated that the relative intensity ratio of the two characteristic vibrational modes at 1525 cm−1 and 1655 cm−1 presents a good and rapid analysis of FFA content in olive oil; the relative intensity ratio decreases linearly with FFA content. In addition, resonance Raman scattering of carotenoid is discussed, showing that a green laser should be utilized to study FFA in olive oil.

scholarly journals Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal–organic framework

2017 ◽  
Vol 19 (47) ◽  
pp. 32099-32104 ◽  
Author(s):  
Alexander Krylov ◽  
Alexander Vtyurin ◽  
Petko Petkov ◽  
Irena Senkovska ◽  
Mariia Maliuta ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Metal Organic Framework ◽  
Low Frequency ◽  
Molecular Dynamic Simulations ◽  
Vibrational Modes ◽  
Dynamic Simulations ◽  
Metal Organic ◽  
Flexible Metal ◽  
Spectroscopy Studies ◽  
Organic Framework

Raman spectroscopy and Molecular Dynamic simulations were applied to study low-frequency vibrations of a flexible metal–organic framework DUT-8(Ni).

scholarly journals Terahertz beats of vibrational modes studied by femtosecond coherent Raman spectroscopy

1987 ◽  
Vol 22 (12) ◽  
pp. 1735-1741 ◽  
Author(s):  
R. Leonhardt ◽  
W. Holzapfel ◽  
W. Zinth ◽  
W. Kaiser
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Modes ◽  
Coherent Raman

scholarly journals Raman Spectra Shift of Few-Layer IV-VI 2D Materials

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Minwoo Park ◽  
Jin Sik Choi ◽  
Li Yang ◽  
Hoonkyung Lee
Keyword(s):  
Raman Spectroscopy ◽  
Layer Structure ◽  
2D Materials ◽  
Vibrational Modes ◽  
Metal Atoms ◽  
Raman Modes ◽  
Interlayer Structure ◽  
Optical Applications ◽  
Few Layer Graphene ◽  
Bulk Structures

AbstractRaman spectroscopy is the most commonly used method to investigate structures of materials. Recently, few-layered IV-VI 2D materials (SnS, SnSe, GeS, and GeSe) have been found and ignited significant interest in electronic and optical applications. However, unlike few-layer graphene, in which its interlayer structures such as the number of its layers are confirmed through measurement of the Raman scattering, few-layer IV-VI 2D materials have not yet been developed to the point of understanding their interlayer structure. Here we performed first-principles calculations on Raman spectroscopy for few-layer IV-VI 2D materials. In addition to achieving consistent results with measurements of bulk structures, we revealed significant red and blue shifts of characteristic Raman modes up to 100 cm−1 associated with the layer number. These shifts of lattice vibrational modes originate from the change of the bond lengths between the metal atoms and chalcogen atoms through the change of the interlayer interactions. Particularly, our study shows weak covalent bonding between interlayers, making the evolution of Raman signals according to the thickness different from other vdW materials. Our results suggest a new way for obtaining information of layer structure of few-layer IV-VI 2D materials through Raman spectroscopy.

Surface vibrational modes of Sb-terminated (110) surfaces of III-V semiconductors investigated by Raman spectroscopy

2002 ◽  
Vol 66 (7) ◽  
Author(s):  
N. Esser ◽  
K. Hinrichs ◽  
J. R. Power ◽  
W. Richter ◽  
J. Fritsch
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Modes
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