A structural study on the excimer state of an isolated benzene dimer using infrared spectroscopy in the skeletal vibration region

2017 ◽  
Vol 19 (34) ◽  
pp. 22759-22776 ◽  
Author(s):  
Mitsuhiko Miyazaki ◽  
Masaaki Fujii
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Structural Study ◽  
Skeletal Vibration ◽  
Benzene Dimer ◽  
Vibrational Excitations

IR spectroscopy on an isolated benzene excimer reveals that both the electronic and vibrational excitations are in resonance.

First Nano-Infrared Spectroscopy and Imaging Measurements of Single Phospholipid Bilayers

2018 ◽  
Author(s):  
Adrian Cernescu ◽  
Michał Szuwarzyński ◽  
Urszula Kwolek ◽  
Karol Wolski ◽  
Paweł Wydro ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Absorption Band ◽  
Spectral Region ◽  
Near Field ◽  
Phospholipid Bilayers ◽  
Model Systems ◽  
Absorption Bands ◽  
Protein Complement ◽  
20 Nm

<div><div>Scattering-mode Scanning Near-Field Optical Microscopy (sSNOM) allows one to obtain absorption spectra in the mid-IR region for samples as small as 20 nm in size. This configuration has made it possible to measure FTIR spectra of the protein complement of membranes. (Amenabar 2013) We now show that mid-IR sSNOM has the sensitivity required to measure spectra of phospholipids in individual bilayers in the spectral range 800 cm<sup>-1</sup>–1400 cm<sup>-1</sup>. We have observed the main absorption bands of the dipalmitoylphosphatidylcholine headgroups in this spectral region above noise level. We have also mapped the phosphate absorption band at 1070 cm<sup>-1</sup> simultaneously with the AFM topography. We have shown that we could achieve sufficient contrast to discriminate between single and multiple phospholipid bilayers and other structures, such as liposomes. This work opens the way to further research that uses nano-IR spectroscopy to describe the biochemistry of cell membranes and model systems.</div></div><div></div>

PHARMACEUTICAL FORMULATION MANUFACTURER DISCRIMINATION BY INFRARED SPECTROSCOPY AND PRINCIPAL COMPONENT ANALYSIS

2019 ◽  
pp. 7-15
Author(s):  
E.M. Basova ◽  
Yu.N. Litvinenko ◽  
N.А. Polotnyanko
Keyword(s):  
Principal Component Analysis ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Principal Component ◽  
Component Analysis ◽  
Active Pharmaceutical Ingredients ◽  
Pharmaceutical Ingredients ◽  
The Third ◽  
Chemometric Technique ◽  
Tablet Formulations

In the present work Fournier transform infrared (IR) spectroscopy in association with chemometric technique was employed to identify kind of tablet formulations containing paracetamol and/or caffeine as active pharmaceutical ingredients. 13 samples of 5 commercially available brand tablets of different manufacturers and batches were bayed in local pharmacies. IR spectra of samples were recorded in the range 600—4000 cm-1 and subjected to and principal component analysis (PCA) which allowed to clearly identify 5 clusters in the scores plot using the third and the second principal components, corresponding to the brands of tablets. For Paracetamol and Caffeine-sodium benzoate tablets the combination of IR spectroscopy and PCA was able to recognize the manufacturer on the basis of distance between samples in clusters in the PCA scores plot.

Ion speciation of lithium hexafluorophosphate in dimethyl carbonate solutions: an infrared spectroscopy study

2018 ◽  
Vol 20 (35) ◽  
pp. 22710-22718 ◽  
Author(s):  
Kristen D. Fulfer ◽  
Daniel G. Kuroda
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Dimethyl Carbonate ◽  
Spectroscopy Study ◽  
Dft Computations ◽  
Carbonate Solutions ◽  
Lithium Hexafluorophosphate

The speciation of lithium hexafluorophosphate (LiPF6) in dimethyl carbonate as function of the concentration is studied via IR spectroscopy and DFT computations.

Application of far-infrared spectroscopy to the structural identification of protein materials

2018 ◽  
Vol 20 (17) ◽  
pp. 11643-11648 ◽  
Author(s):  
Yanchen Han ◽  
Shengjie Ling ◽  
Zeming Qi ◽  
Zhengzhong Shao ◽  
Xin Chen
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Far Infrared ◽  
Structural Identification ◽  
Globular Proteins ◽  
Far Infrared Spectroscopy ◽  
Silk Fibroins

Far-IR spectroscopy was applied to monitor the structure of two types of silk fibroins and the results indicate that they both show several sharp characteristic peaks, which are totally different from those of globular proteins.

Structural Study on Magnesium Ion Solvation in Diglyme-Based Electrolytes: IR Spectroscopy and DFT Calculations

2018 ◽  
Vol 122 (37) ◽  
pp. 8712-8717 ◽  
Author(s):  
Kenta Fujii ◽  
Michiru Sogawa ◽  
Nobuko Yoshimoto ◽  
Masayuki Morita
Keyword(s):  
Ir Spectroscopy ◽  
Dft Calculations ◽  
Structural Study ◽  
Ion Solvation ◽  
Magnesium Ion

Influence of the microsolvation on hemibonded and protonated hydrogen sulfide: infrared spectroscopy of [(H2S)n(X)1]+ and H+(H2S)n(X)1 (n = 1 and 2, X = water, methanol, and ethanol)

2019 ◽  
Vol 21 (29) ◽  
pp. 16064-16074 ◽  
Author(s):  
Keigo Hattori ◽  
Dandan Wang ◽  
Asuka Fujii
Keyword(s):  
Hydrogen Sulfide ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy

The microsolvation effect on the S∴S hemibond is studied by IR spectroscopy of model clusters of H2S, and the results are compared with the microsolvation of protonated H2S clusters.

Structural Properties of High Electronic Quality a-Si1-xCx:H by Infrared Spectroscopy

1992 ◽  
Vol 258 ◽  
Author(s):  
K. Eberhardt ◽  
E. Lotter ◽  
M. Heintze ◽  
H.-D. Mohring ◽  
G.H. Bauer
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Structural Properties ◽  
Hydrogen Content ◽  
Low Carbon ◽  
Absorption Data ◽  
Experimental Transmission ◽  
Wide Compositional Range ◽  
Ir Analysis ◽  
Thickness Independent

ABSTRACTInfrared (ir) spectroscopy is used to investigate the structural properties of a-SiC:H in a wide compositional range and as a function of film thickness. Hydrogen content NH increases considerably with increasing carbon fraction. For low carbon alloys this is mainly due to an increase of hydrogen bonded to silicon, incorporated in a mono- or dihydride form. Above Eg=2.3eV the proportion of hydrogen incorporated in C-H bonds increases considerably. Oxidation of high C alloys is observed. Converting experimental transmission exactly into absorption data yields thickness independent NH values. It is shown that the previously reported discrepancy between the hydrogen content calculated from ir and nuclear reaction techniques is an artifact of the ir analysis.

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