scholarly journals Infrared spectrum of HDO in water and in NaCl solution

1970 ◽  
Vol 48 (4) ◽  
pp. 607-614 ◽  
Author(s):  
Hans R. Wyss ◽  
Michael Falk
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Spectral Region ◽  
High Frequency ◽  
Molecular Geometry ◽  
Wide Distribution ◽  
Molar Absorptivity ◽  
Nacl Solution ◽  
Salt Solutions ◽  
Infrared Band

The molar absorptivity of dilute HDO in water and in aqueous NaCl solutions was determined at temperatures between 10 and 85° in the spectral region from 4000 to 2000 cm−1.The infrared band profiles for the OH and OD stretching fundamentals are single-peaked and devoid of shoulders, in contrast to the high-frequency shoulders recently observed in the Raman spectrum. It is shown that such shoulders do not contradict a single-peaked distribution of OH oscillators with respect to inter-molecular geometry. Absence of resolvable sub-bands in the spectrum of HDO in concentrated salt solutions indicates a wide distribution of ion–H2O interactions, akin to the distribution of H2O–H2O interactions in water.

Acetyl Cyanide III. Vibrational Spectrum and Vibrational Analysis

1976 ◽  
Vol 31 (11) ◽  
pp. 1408-1412 ◽  
Author(s):  
H. M. Heise ◽  
F. Scappini ◽  
H. Dreizler
Keyword(s):  
Raman Spectrum ◽  
Liquid Phase ◽  
Infrared Spectrum ◽  
Vibrational Spectrum ◽  
Vibrational Analysis ◽  
Normal Coordinate Analysis ◽  
Normal Coordinate ◽  
Infrared Band

Abstract The infrared spectrum of gaseous acetyl cyanide, CH3COCN, has been recorded from 90 - 3200 cm-1. The Raman spectrum of the liquid phase has been measured between 100 and 500 cm-1. The eighteen fundamental vibrations have been assigned, mainly on the basis of the infrared band contours, and a normal coordinate analysis has been made.

scholarly journals Resonanz-Raman-Effekt von Thiocyanatkomplexen einiger Übergangsmetalle

1970 ◽  
Vol 25 (10) ◽  
pp. 1394-1400 ◽  
Author(s):  
W. Krasser ◽  
H. W. Nürnberg
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectra ◽  
High Intensity ◽  
High Frequency ◽  
Resonance Raman ◽  
Ammonium Salts ◽  
Iron Cobalt ◽  
Decay Products ◽  
Thiocyanate Complexes ◽  
Resonance Raman Spectra

Abstract The thiocyanates of the transition metals iron, cobalt, copper as well as of rhenium and of tech-netium appear in solution as strongly coloured complexes. The resonance raman bands in the sol-vent acetonitrile are investigated. To achieve an unambiguous identification the infrared spectra were recorded too. The change in position and structure of the acetonitrile bands indicates strong complexation of iron, cobalt and copper with acetonitrile, thus indicating the existence of mixed acetonitrile-thiocyanate complexes. The resonance raman spectra of the rhenium-and technetium-thiocyanates present as tetramethyl ammonium salts show however no raman-and infrared-bands of complexed acetonitrile molecules.In the raman spectrum of the thiocyanates of iron, cobalt and copper mainly the totally sym-metric C≡N, S-C, Me-S and Me-N valence vibrations are observed, among which the S-C vibration shows a remarkably high intensity. Besides, a series of bands is obtained which is inter-preted partly as caused by decay products, and partly as bands of complexed acetonitrile. The thiocyanates of rhenium and of technetium show the three possible valence vibrations only. The high frequency of the S-C valence indicates the N-coordination of the thiocyanate group.

scholarly journals Eimeria spp. infection in lambs from southern Brazil

2020 ◽  
Vol 40 (11) ◽  
pp. 871-874
Author(s):  
Natália S. Martins ◽  
Sara P. da Motta ◽  
Carolina C. Santos ◽  
Andrios S. Moreira ◽  
Nara A.R. Farias ◽  
...  
Keyword(s):  
High Frequency ◽  
Eimeria Species ◽  
Rio Grande ◽  
Wide Distribution ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Sheep Industry ◽  
Eimeria Spp ◽  
Potential Damage ◽  
First Time

ABSTRACT: Eimeria infections are common in the sheep industry worldwide. Lambs are more susceptible to coccidiosis, especially in stressful conditions, being infected by different species of the parasite. Eimeria crandallis and Eimeria ovinoidalis are considered the most pathogenic, causing reduced growth, dehydration, anorexia, and death. In this study, the frequency of Eimeria species was evaluated in lambs from the southern region of the Rio Grande do Sul state, Brazil. Fecal samples from 248 lambs, from 19 farms, were tested for the presence of oocysts. The positive samples were re-examined and the sporulated oocysts analyzed morphometrically to identify the presence of Eimeria species. In 100% of the evaluated farms, there were animals positive for the protozoan. The frequency of Eimeria species was: E. ovinoidalis (94.74%), E. crandallis (89.47%), E. granulosa (78.95%), E. parva (68.42%), E. ahsata (63.13%), E. punctata (42.11%), E. bakuensis (36.84%), E. faurei (10.53%), and E. pallida (5.26%). Mixed infection was found in 94.74% of the samples. This research describes, for the first time, the occurrence of E. crandallis and E. ovinoidalis infecting lambs in the study area. The wide distribution of this protozoan and the high frequency of pathogenic species show the importance and potential damage of sheep coccidiosis in herds from Rio Grande do Sul.

Infrared Electroabsorption Spectra in Amorphous Silicon Solar Cells

1999 ◽  
Vol 557 ◽  
Author(s):  
J. H. Lyou ◽  
Eric A. Schiff ◽  
Steven S. Hegedus ◽  
S. Guha ◽  
J. Yang
Keyword(s):  
Solar Cells ◽  
Infrared Spectrum ◽  
Amorphous Silicon ◽  
Optical Transition ◽  
Silicon Solar Cells ◽  
Reverse Bias Voltage ◽  
Dangling Bond ◽  
Applied Bias ◽  
Infrared Band ◽  
Peak Energy

AbstractWe report measurements of the infrared spectrum detected by modulating the reverse-bias voltage across amorphous silicon pin solar cells and Schottky barrier diodes. We find a band with a peak energy of 0.8 eV. The existence of this band has not, to our knowledge, been reported previously. The strength of the infrared band depends linearly upon applied bias, as opposed to the quadratic dependence for interband electroabsorption in amorphous silicon.The band's peak energy agrees fairly well with the known optical transition energies for dangling bond defects, but the linear dependence on bias and the magnitude of the signal are surprising if interpreted using an analogy to interband electroabsorption. A model based on absorption by defects near the n/i interface of the diodes accounts well for the infrared spectrum.

scholarly journals Hydration and ion pair formation in common aqueous La(iii) salt solutions – a Raman scattering and DFT study

2015 ◽  
Vol 44 (1) ◽  
pp. 295-305 ◽  
Author(s):  
Wolfram W. Rudolph ◽  
Gert Irmer
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Ion Pair ◽  
Pair Formation ◽  
Dft Study ◽  
Salt Solutions ◽  
Left Hand ◽  
Ion Pair Formation ◽  
Right Hand

Left hand side: Raman spectrum of a 0.622 mol L−1La(ClO4)3(aq). Weak, polarized band at 343 cm−1assigned to symmetric La–O stretch of [La(OH2)9]3+. Bands at 463 and 630 cm−1due to ClO4−(aq). The inset shows the isotropic band in more detail. Right hand side: Structure of [La(OH2)9]3+(symmetryD3).

Preparation, Characterization and Swelling Behaviours of a Novel Multifunctional Superabsorbent Composite Based on Ca-Montmorillonite and Sodium Humate

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Yian Zheng ◽  
Aiqin Wang
Keyword(s):  
Graft Copolymerization ◽  
Water Absorbency ◽  
Optimal Conditions ◽  
Nacl Solution ◽  
Inorganic Component ◽  
X Ray Diffraction ◽  
Salt Solutions ◽  
X Ray ◽  
Sodium Humate ◽  
Superabsorbent Composite

AbstractIn this work, a novel water-managing superabsorbent composite was prepared by graft copolymerization reaction using acrylic acid (AA) and acrylamide (AM) as the monomers, calcium montmorillonite (Ca-MMT) as an inorganic component and sodium humate (SH) as fertilizer, and well characterized by means of Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The effects of the reaction temperature, neutralization degree of AA, amount of crosslinker, initiator, Ca-MMT and SH on water absorbencies were systematically investigated. The water absorbencies of the superabsorbent composite synthesized under optimal conditions with a Ca-MMT content of 20 wt% and an SH content of 30 wt% are 615 g g-1 and 45 g g-1 in distilled water and in 0.9 wt% NaCl solution, respectively. The swelling behaviours of the superabsorbent composite in various cationic salt solutions (NaCl, CaCl2 and FeCl3) were also investigated and it was found that at the same saline concentration (> 0.1 mmol L-1), the effect of three cationic salt solutions on the swelling capability has the following order: NaCl < CaCl2 < FeCl3. Here, it is worthy to point out that the water absorbency and swelling behaviours of the developed composite were improved by introducing simultaneously Ca-MMT and SH into PAA-AM network in comparison with that of incorporated single with Ca-MMT or SH.

scholarly journals Molecular Structure and Vibrational Spectra of 2-Ethylhexyl Acrylate by Density Functional Theory Calculations

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Ottman Belaidi ◽  
Tewfik Bouchaour ◽  
Ulrich Maschke
Keyword(s):  
Density Functional Theory ◽  
Infrared Spectrum ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Molecular Geometry ◽  
Electron Diffraction Data ◽  
Functional Theory ◽  
Infrared Intensities ◽  
The Fourier Transform ◽  
Optimized Geometries

The Fourier transform infrared spectra (FTIR) of 2-ethylhexyl acrylate have been measured in liquid phase. The molecular geometry, vibrational frequencies, and infrared intensities have been calculated by using density functional theory. We found two local minima representing s-cis and s-trans conformations for 2-ethylhexyl acrylate molecule. The optimized geometries at DFT//B3LYP/6-311+ are in good agreement with electron diffraction data of methyl acrylate for the acrylic group. The two conformers were used for the interpretation of the experimental infrared spectrum of title compound. PED calculations are represented for a more complete and concise assignment. There is one band in the infrared spectrum at 1646 cm−1 that definitely indicates the conformer with s-trans arrangement of acrylic moiety to be present or not in the liquid 2-ethylhexyl acrylate.

The Infrared and Raman Spectra of Trifluoronitrosomethane

1974 ◽  
Vol 52 (18) ◽  
pp. 3149-3157 ◽  
Author(s):  
Herbert F. Shurvell ◽  
Shiv C. Dass ◽  
Robert D. Gordon
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Potential Energy ◽  
Internal Rotation ◽  
Condensed Phase ◽  
Infrared And Raman Spectra ◽  
Vibrational Assignment ◽  
Normal Coordinate ◽  
Energy Distributions ◽  
Torsional Mode

The infrared spectrum of gaseous CF3NO has been studied in the region 4000–35 cm−1. The infrared spectrum of the condensed phase has also been recorded and a complete vibrational assignment is proposed. Attempts to record the Raman spectrum have been hampered by photolysis. A frequency of 50 cm−1 for the CF3 torsional mode has been estimated from combination and hot bands. This corresponds to a barrier to internal rotation of approximately 425 cal/mol (150 cm−1). A normal coordinate analysis has been carried out and potential energy distributions, and valence and symmetry force constants are reported.

Millimeter-Wave Spectroscopy, High-Resolution Infrared Spectrum, ab Initio Calculations, and Molecular Geometry of FPS

2001 ◽  
Vol 210 (2) ◽  
pp. 213-223 ◽  
Author(s):  
Helmut Beckers ◽  
Marcel Bogey ◽  
Jürgen Breidung ◽  
Hans Bürger ◽  
Jean Demaison ◽  
...  
Keyword(s):  
High Resolution ◽  
Infrared Spectrum ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Millimeter Wave ◽  
Molecular Geometry ◽  
Millimeter Wave Spectroscopy
Sign in / Sign up

Export Citation Format

Share Document