Discrimination and quantification of sulfathiazole polytypes using low-frequency Raman spectroscopy

CrystEngComm ◽  
2018 ◽  
Vol 20 (14) ◽  
pp. 1928-1934 ◽  
Author(s):  
Kentaro Iwata ◽  
Masatoshi Karashima ◽  
Yukihiro Ikeda ◽  
Motoki Inoue ◽  
Toshiro Fukami
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency

Low-frequency Raman spectroscopy has advantage to discriminate and quantify polymorphs where common 2D superstructures are piled up with different mode.

A report on the longitudinal accordian mode in polyalkenamers using low frequency Raman spectroscopy

Polymer ◽  
1979 ◽  
Vol 20 (6) ◽  
pp. 780-781 ◽  
Author(s):  
G.V. Fraser ◽  
A. Keller ◽  
J.M. Pastor ◽  
J.A. De Saha ◽  
E. Martuscelli
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency

Exploring interlayer interaction of SnSe2 by low-frequency Raman spectroscopy

2019 ◽  
Vol 105 ◽  
pp. 7-12 ◽  
Author(s):  
Xiang Zhou ◽  
Junyi Li ◽  
Yuchen Leng ◽  
Xin Cong ◽  
Dameng Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency ◽  
Interlayer Interaction

scholarly journals Polarization Dependence of Low-Frequency Vibrations from Multiple Faces in an Organic Single Crystal

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 425 ◽  
Author(s):  
Nemtsov ◽  
Aviv ◽  
Mastai ◽  
Tischler
Keyword(s):  
Raman Spectroscopy ◽  
Intermolecular Interactions ◽  
Signal Intensity ◽  
Structural Information ◽  
Low Frequency ◽  
Incident Beam ◽  
Optical Filters ◽  
Polarization Dependence ◽  
Raman Signal ◽  
Shear Modes

Recent developments in optical filters have enabled the facile use of Raman spectroscopy for detection of low frequency (LF) vibrational modes. LF-Raman spectroscopy offers fast and sensitive characterization of LF vibrations, and enables the measurement of single microcrystals and detection of defects. It is useful for probing intermolecular interactions in crystals, which are lower in energy, such as hydrogen bonds, shear modes, and breathing modes. Crystal excitation from multiple faces allows learning the orientation of intermolecular interactions, as polarization dependence varies with the polarizability of the interactions along the planes. Elucidating the orientations of the intermolecular interactions in organic crystals is essential for guiding the reactions or adsorption to a specific crystal face. In this study, we investigated the dependence of the LF-Raman signal intensity on the orientation of an organic single microcrystal of L-alanine. Three incident beam directions provided the orientations of the intermolecular interactions by analyzing the corresponding LF-Raman spectra. The signal intensity correlated well with the proximity between the incident beam’s direction and the orientations of the intermolecular interactions. Excellent compatibility was found between the spectra and simulated orientations based on structural information.

scholarly journals Conformationally Dependent Low-Frequency Motions of Proteins by Laser Raman Spectroscopy

1972 ◽  
Vol 69 (6) ◽  
pp. 1467-1469 ◽  
Author(s):  
K. G. Brown ◽  
S. C. Erfurth ◽  
E. W. Small ◽  
W. L. Peticolas
Keyword(s):  
Raman Spectroscopy ◽  
Low Frequency ◽  
Laser Raman Spectroscopy ◽  
Laser Raman
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