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.

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>

Effects of local stress, strain, and hydrogen content on hydrogen-related fracture behavior in low-carbon martensitic steel

2021 ◽  
pp. 116828
Author(s):  
Akinobu Shibata ◽  
Takashi Yonemura ◽  
Yuji Momotani ◽  
Myeong-heom Park ◽  
Shusaku Takagi ◽  
...  
Keyword(s):  
Hydrogen Content ◽  
Fracture Behavior ◽  
Martensitic Steel ◽  
Local Stress ◽  
Low Carbon ◽  
Stress Strain ◽  
Carbon Martensitic Steel

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.

Structural properties of (Mn1-x Fe x )Nb2O6 columbites from X-ray diffraction and IR spectroscopy

2005 ◽  
Vol 32 (8-9) ◽  
pp. 568-577 ◽  
Author(s):  
S. C. Tarantino ◽  
M. Zema ◽  
F. Maglia ◽  
M. C. Domeneghetti ◽  
M. A. Carpenter
Keyword(s):  
Ir Spectroscopy ◽  
Structural Properties ◽  
X Ray Diffraction ◽  
X Ray

STUDY OF STRUCTURAL PROPERTIES OF BISMUTH PYROSTANNATE BY RAMAN AND IR SPECTROSCOPY

2020 ◽  
Vol 21 (4) ◽  
pp. 556-564
Author(s):  
L. V. Udod ◽  
◽  
O. B. Romanova ◽  
S. S. Aplesnin ◽  
V. V. Kretinin ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Structural Properties ◽  
Raman And Ir Spectroscopy

The hydrogen content of a-Ge:H and a-Si:H as determined by ir spectroscopy, gas evolution and nuclear reaction techniques

1980 ◽  
Vol 35-36 ◽  
pp. 255-260 ◽  
Author(s):  
C.J. Fang ◽  
K.J. Gruntz ◽  
L. Ley ◽  
M. Cardona ◽  
F.J. Demond ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Nuclear Reaction ◽  
Hydrogen Content ◽  
Gas Evolution

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.

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