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Open AccessArticle

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

Department of Chemistry and Bar Ilan Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan 5290002, Israel
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Crystals 2019, 9(8), 425; https://doi.org/10.3390/cryst9080425
Received: 16 July 2019 / Revised: 5 August 2019 / Accepted: 14 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Raman Spectroscopy of Crystals)
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. View Full-Text
Keywords: microcrystal; low frequency Raman; crystal orientation; intermolecular interactions microcrystal; low frequency Raman; crystal orientation; intermolecular interactions
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MDPI and ACS Style

Nemtsov, I.; Aviv, H.; Mastai, Y.; Tischler, Y.R. Polarization Dependence of Low-Frequency Vibrations from Multiple Faces in an Organic Single Crystal. Crystals 2019, 9, 425.

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