Fringes in FTIR spectroscopy revisited: understanding and modelling fringes in infrared spectroscopy of thin films

The Analyst ◽  
2015 ◽  
Vol 140 (12) ◽  
pp. 3969-3980 ◽  
Author(s):  
Tatiana Konevskikh ◽  
Arkadi Ponossov ◽  
Reinhold Blümel ◽  
Rozalia Lukacs ◽  
Achim Kohler
Keyword(s):  
Thin Films ◽  
Infrared Spectroscopy ◽  
Ftir Spectroscopy ◽  
Spectral Bands

The appearance of fringes in the infrared spectroscopy of thin films seriously hinders the interpretation of chemical bands because fringes change relative peak heights of chemical spectral bands.

Explosive Thermal Decomposition Mechanism of NTO

1995 ◽  
Vol 418 ◽  
Author(s):  
David J. Beardall ◽  
Tod R. Botcher ◽  
Charles A. Wight
Keyword(s):  
Thin Films ◽  
Thermal Decomposition ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Condensed Phase ◽  
Decomposition Product ◽  
Rapid Heating ◽  
Initial Step ◽  
Thermal Decomposition Mechanism ◽  
Decomposition Products

AbstractThe initial step of the thermal decomposition of NTO (5-nitro-2,4-dihydro-3H-1,2,4- triazol-3-one) is determined by pulsed infrared laser pyrolysis of thin films. Rapid heating of the film and quenching to 77 K allows one to trap the initial decomposition products in the condensed phase and analyze them using transmission Fourier-transform infrared spectroscopy. The initial decomposition product is CO2; NO2 and HONO are not observed. We propose a new mechanism for NTO decomposition in which CO2 is formed.

Raman and FTIR Spectroscopy of Synthetic Amphiboles: II. Divalent (Mg,Co) Substitutions at the Octahedrally Coordinated Sites

2021 ◽  
Author(s):  
Giancarlo Della Ventura ◽  
Boriana Mihailova ◽  
Frank C. Hawthorne
Keyword(s):  
Infrared Spectroscopy ◽  
Ftir Spectroscopy ◽  
Raman Spectra ◽  
Structure Refinement ◽  
Chemical Compositions ◽  
Mode Behavior ◽  
Wavenumber Region

Abstract Raman spectra were recorded for a set of synthetic amphiboles, Na(NaCa)(Mg5–xCox)Si8O22(OH)2 with x = 0–5, that have been previously characterized by Rietveld structure refinement and infrared spectroscopy in the principal OH-stretching region. The chemical compositions derived from the intensities of the O-H stretching Raman peaks are in accord with the nominal compositions, as well as with the compositions previously determined by both Rietveld structure refinement and infrared spectroscopy. Detailed peak assignments have been made of the Raman spectra in the low-wavenumber region (50–1200 cm–1) starting from the work of Leissner et al. (2015) and Waeselmann et al. (2019) and the simulated partial Raman spectra for all the cation-anion pairs in the structure of potassic-magnesio-arfvedsonite given by Ivanov et al. (2018). Most Raman peaks exhibit one-mode behavior and shift toward lower wavenumbers for increasing Co in the amphibole.

scholarly journals The Influence of UV Radiation on the Degradation of Pharmaceutical Formulations Containing Quercetin

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5454
Author(s):  
Iwona Golonka ◽  
Stanisław Wilk ◽  
Witold Musiał
Keyword(s):  
Quality Assurance ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Decay Rate ◽  
Ftir Spectroscopy ◽  
Polyacrylic Acid ◽  
Decomposition Rate ◽  
Pharmaceutical Formulations ◽  
Polymeric Gels ◽  
The Stability

The aim of this study was to assess the photostability of quercetin in the presence of anionic and nonionic polymeric gels with varied compositions of an added component—glycerol. The samples were irradiated continuously at constant temperature. The stability of quercetin in solution and incorporated into the gels was evaluated by an UV-Vis spectrophotometer. FTIR spectroscopy (Fourier-transform infrared spectroscopy) was used to detect the changes in the structure of quercetin depending on the polymer used in the gel, and on the exposure time. Photostabilization is an important aspect of quality assurance in photosensitive compounds. The decomposition rate of quercetin in the ionic preparation of polyacrylic acid (PAA) with glycerol was 1.952·10−3 min−1, whereas the absence of glycerol resulted in a decay rate of 5.032·10−4 min−1. The formulation containing non-ionic methylcellulose resulted in a decomposition rate of quercetin in the range of 1.679·10−3 min−1. The decay rate of quercetin under light influence depended on the composition of the gel. It was found that the cross-linked PAA stabilized quercetin and the addition of glycerol accelerated the photodegradation.

scholarly journals Characterisation Of Polysacharides And Lipids From Selected Green Algae Species By FTIR-ATR Spectroscopy

2015 ◽  
Vol 23 (36) ◽  
pp. 97-102 ◽  
Author(s):  
Alica Bartošová ◽  
Lenka Blinová ◽  
Kristína Gerulová
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ftir Spectroscopy ◽  
Green Algae ◽  
Spectral Range ◽  
Chlorella Sorokiniana ◽  
Spectral Features ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Atr Spectroscopy ◽  
Chromochloris Zofingiensis

Abstract Fourier transform infrared (FTIR) spectroscopy was used in this study to identify and determine spectral features of Chromochloris zofingiensis (Dönz) Fucíková et L.A. Lewis (SAG 211-14, Gottingen, Germany), Acutodesmus obliguus (Turpin) Hegewald (SAG 276-1, Gottingen, Germany) and Chlorella sorokiniana (K. Brandt) Pröschold et Darienko (SAG 211-40c, Gottingen, Germany). Polysaccharides and lipids from these three algae species were determined using Fourier Transformed Infrared Spectroscopy (FTIR) with ATR accessory with diamante crystal in spectral range from 400 – 4000 cm−1 and resolution 4.

Enhanced crystallization kinetics in poly(ethylene terephthalate) thin films evidenced by infrared spectroscopy

Polymer ◽  
2010 ◽  
Vol 51 (16) ◽  
pp. 3660-3668 ◽  
Author(s):  
Monica Bertoldo ◽  
Massimiliano Labardi ◽  
Cinzia Rotella ◽  
Simone Capaccioli
Keyword(s):  
Thin Films ◽  
Infrared Spectroscopy ◽  
Crystallization Kinetics ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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