Spectral Subtraction Using Fourier Transform Infrared Spectroscopy—Fact or Artifact

Strassburger, John; Smith, I. Trevor

doi:10.1366/0003702794925912

Cited by 11 publications

(3 citation statements)

References 2 publications

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“…28 For each lipid mixture, a part of the sample and the reference measurements are used in order to prevent the retention of any background after the correction. Lipids used had a concentration of 1 mg/ml.…”

Section: Ftirmentioning

confidence: 99%

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

Hohner¹,

David²,

Rädler³

2010

Biointerphases

115

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Section: Ftirmentioning

confidence: 99%

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

Hohner¹,

David²,

Rädler³

2010

Biointerphases

115

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“…Usually this technique yields sufficiently thin films for quantitative analysis. The criteria for the analysis is that Beer's law be obeyed; hence low absorptions are needed (7). Identical infrared spectra were also obtained for films cast as formed at 25°C.…”

Section: Infrared Analysismentioning

confidence: 99%

Structural and mechanical properties of polybutadiene‐containing polyurethanes

Brunette

Hsu

MacKnight

et al. 1981

Polymer Engineering & Sci

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A series of segmented polyurethanes based on hydroxylterminated polybutadienes (HTPBD) and their hydrogenated derivatives(HYPBD) has been synthesized. Thermal, mec:hanic:aL and spectrosc:opic: studies were c:arried out over a wide temperature range to elucidate the structure-property relationships existing in these polymers. Both thermal and dynamic mechanical response showed a soft segment Tu at-74°C forthe unsaturated polyurethanes and at -69"C for the hydrogenated samples. In addition, two hard segment transitions are. observed by differential scanning c:alorimetry (DSC) at 40 and 75°C and a softening region by thermal mechanical analysis (TMA) at 190"C. The low T,,. very dose to that of the free HTPBD and HYPBD and independent of hard segment c:ontent. indicated that these polymers were well phase separated. Results of infrared analysis revealed that at room temperature, 90-95 percent of the urethane N-H groups formed hydrogen bonds. Since hydrogen bonding resides only within the hard segment domain in these butadiene-c:ontaining polyurethanes the extent of H-bonding served as additional evidence for nearly complete phase segregation. From dynamic: mechanical studies, the plateau modulus above the soft segment Tu and stress-strain behavior depended upon the concentration of hard segments. A slight increase in the modulus, a moderate increase in stress (er,,), and decrease in elongation accompanied a higher hard segment content. The thermal and mechanical response of these polyurethanes appears to be consistent with behavior observed for other phase segregated systems. Variations in behavior resulting from hydrogenation of the precursor prepolymer are discussed.

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“…However, a certain spectral artifact level may be tolerable in a given experiment. For example, the experimentally determined artifact levels in reference [7] were plotted on vertical display scales of zéro ± several hundreths of an absorbance unit, suggesting that experimental difference-spectral excursions much greater than about ± 0.05 absorbance unit would not be interpreted as artifacts. Although a large number of calculated and experimental difference-spectra artifacts are available in references [4] and [5], there is no concise and comprehensive tabulation of artifact sizes as a function of A0(t), p ( = 1/ PG ) , and ILS function.…”

Section: Origin and Importance Of Apodizationmentioning

confidence: 99%

Apodization effects in Fourier transform infrared difference spectra

Bretzlaff

Bahder

1986

Rev. Phys. Appl. (Paris)

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Dans le cas de bandes intenses des artefacts dus au processus d'apodisation peuvent apparaître dans les spectres infrarouges obtenus par transformée de Fourier. Ces effets ont déjà été étudiés sur des spectres obtenus par différence pour des fonctions d'apodisation de type boxcar ou triangulaire. Ce travail présente des simulations numériques réalisées avec une fonction d'apodisation de type Happ-Genzel couramment employée dans les instruments modernes. Pour comparer les performances des fonctions d'appareil de type boxcar, triangulaire, ou Happ-Genzel nous avons calculé (i) les artefacts apparaissant dans les spectres obtenus par différence ; (ii) la variation de l'absorbance apparente au sommet d'un pic d'absorption en fonction de l'absorbance vraie ; (iii) une mesure intégrée de l'erreur due à ces artefacts pour une bande d'absorption à profil lorentzien. L'étude est faite pour des valeurs de p (rapport de la largeur totale du pic à mi-hauteur à la résolution) qu'on rencontre couramment en spectroscopie de transmission d'échantillons solides ou translucides.Abstract. -Artifacts may occur in Fourier transform infrared (FTIR) spectra due to the apodization of the interferograms of intense bands. Selected examples of boxcar and triangular apodization effects on difference spectra have been previously reported. This paper reports the first such calculation performed for the Happ-Genzel apodization function, which is often used on modern spectrometers. In order to compare boxcar, triangular, and Happ-Genzel apodization functions we calculate (i) difference-spectrum artifacts, (ii) apparent versus true peak absorbances, and (iii) a measure of integrated artifact area for several true peak intensities of Lorentzian-band shapes. Values of p (ratio of full bandwidth at half height to nominal resolution) are emphasized which commonly occur in the transmission-mode spectroscopy of transparent or translucent solid samples.

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Spectral Subtraction Using Fourier Transform Infrared Spectroscopy—Fact or Artifact

Cited by 11 publications

References 2 publications

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

Controlled solvent-exchange deposition of phospholipid membranes onto solid surfaces

Structural and mechanical properties of polybutadiene‐containing polyurethanes

Apodization effects in Fourier transform infrared difference spectra

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