Dynamic Infrared Linear Dichroism of Polymers†Much of this material was based on Chapter 21 in “Fourier Transform Infrared Spectrometry”, Second Edition, by P. R. Griffiths and J. A. de Haseth, Wiley Interscience, Hoboken (2007).

Griffiths, Peter R.; Arbuckle-Keil, Georgia

doi:10.1002/9780470027325.s8922

Cited by 224 publications

(338 citation statements)

References 18 publications

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“…Diffuse reflection spectra appear to be similar to transmission spectra derived from poorly prepared KBr disks. 16 If the sample of interest is located as a film on a smooth metal surface, the resulting reflection spectra are quite similar to corresponding transmission spectra. In this case, the incident beam is reflected by the metal layer and thus passes through the film twice.…”

Section: Data Evaluationmentioning

confidence: 87%

“…Therefore, mathematical transformation (KramersKronig transformation) has to be applied in order to gain absorbance-like spectra which may be compared to actual database spectra. 16 However, the transformation will yield accurate results only when diffuse reflectance does not contribute to the analytic signal. This fact raises the questions how far this precondition can be met when paint layers were analyzed and in which way contributing diffuse reflection influences the usability of the results.…”

Section: Reflection Ftir Spectroscopymentioning

confidence: 99%

“…- 16 These phenomena are based on the Fresnel equation and thus, Kramers-Kronig transformation can be applied to calculate absorption index spectra, which are comparable to absorption spectra measured in the transmission mode. In order to obtain useful specular reflectance spectra, following conditions must be considered: 1.…”

Section: Data Evaluationmentioning

confidence: 99%

“…1 The diamond cell in a FTIR microscope as well achieved with current chalcogenide optical fibres absorbing radiation below 900 cm -1 . 8,16 2 Experimental…”

Section: Introductionmentioning

confidence: 99%

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Identification and Preservation of Cultural Heritage

Schreiner¹,

Wiesinger²,

Vetter³

2017

ChemViews

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Section: Data Evaluationmentioning

confidence: 87%

Section: Reflection Ftir Spectroscopymentioning

confidence: 99%

Section: Data Evaluationmentioning

confidence: 99%

“…1 The diamond cell in a FTIR microscope as well achieved with current chalcogenide optical fibres absorbing radiation below 900 cm -1 . 8,16 2 Experimental…”

Section: Introductionmentioning

confidence: 99%

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Identification and Preservation of Cultural Heritage

Schreiner¹,

Wiesinger²,

Vetter³

2017

ChemViews

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“…When Fourier transforming a time-domain signal collected in a window of nite duration, a boxcar function becomes convolved with the true time-domain signal, resulting in each line in the frequency domain being convolved with a sinc function. 20 Spectral leakage arises because a sinc function will add many sidelobes to the main peak, and so distinguishing between separate peaks becomes more difficult. Choosing a different apodization function from the boxcar will suppress the sidelobes and prevent spectral leakage that would arise from the sidelobes of one feature overlapping with the peak of another nearby feature.…”

Section: Data Processingmentioning

confidence: 99%

THz and mid-IR spectroscopy of interstellar ice analogs: methyl and carboxylic acid groups

et al. 2014

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A fundamental problem in astrochemistry concerns the synthesis and survival of complex organic molecules (COMs) throughout the process of star and planet formation. While it is generally accepted that most complex molecules and prebiotic species form in the solid phase on icy grain particles, a complete understanding of the formation pathways is still largely lacking. To take full advantage of the enormous number of available THz observations (e.g., Herschel Space Observatory, SOFIA, and ALMA), laboratory analogs must be studied systematically. Here, we present the THz (0.3-7.5 THz; 10-250 cm À1 ) and mid-IR (400-4000 cm À1 ) spectra of astrophysically-relevant species that share the same functional groups, including formic acid (HCOOH) and acetic acid (CH 3 COOH), and acetaldehyde (CH 3 CHO) and acetone ((CH 3 ) 2 CO), compared to more abundant interstellar molecules such as water (H 2 O), methanol (CH 3 OH), and carbon monoxide (CO). A suite of pure and mixed binary ices are discussed. The effects on the spectra due to the composition and the structure of the ice at different temperatures are shown. Our results demonstrate that THz spectra are sensitive to reversible and irreversible transformations within the ice caused by thermal processing, suggesting that THz spectra can be used to study the composition, structure, and thermal history of interstellar ices.Moreover, the THz spectrum of an individual species depends on the functional group(s) within that molecule. Thus, future THz studies of different functional groups will help in characterizing the chemistry and physics of the interstellar medium (ISM).

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Ultraviolet and Visible Spectroscopy

Gauglitz

2008

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 1.1. Comparison with Other Spectroscopic Methods 1.2. Development and Uses 2. Theoretical Principles 2.1. Electronic States and Orbitals 2.2. Interaction Between Radiation and Matter 2.2.1. Dispersion 2.2.2. Absorption 2.2.3. Scattering 2.2.4. Reflection 2.2.5. Band Intensity 2.3. The Lambert–BeerLaw 2.3.1. Definitions 2.3.2. Deviations from the Lambert ‐ Beer Law 2.4. Photophysics 2.4.1. Energy Level Diagram 2.4.2. Deactivation Processes 2.4.3. Transition Probability and Fine Structure of the Bands 2.5. Chromophores 2.6. Optical Rotatory Dispersion and Circular Dichroism 2.6.1. Generation of Polarized Radiation 2.6.2. Interaction with Polarized Radiation 2.6.3. Optical Rotatory Dispersion 2.6.4. Circular Dichroism and the Cotton Effect 2.6.5. Magnetooptical Effects 3. Optical Components and Spectrometers 3.1. Principles of Spectrometer Construction 3.1.1. Sequential Measurement of Absorption 3.1.2. Multiplex Methods in Absorption Spectroscopy 3.2. Light Sources 3.2.1. Line Sources 3.2.2. Sources of Continuous Radiation 3.2.3. Lasers 3.3. Selection of Wavelengths 3.3.1. Prism Monochromators 3.3.2. Grating Monochromators 3.3.3. Electro‐Acoustic and Opto‐Acoustic Wavelength Generation 3.4. Polarizers and Analyzers 3.5. Sample Compartments and Cells 3.5.1. Closed Compartments 3.5.2. Modular Arrangements 3.5.3. Open Compartments 3.6. Detectors 3.7. Optical Paths for Special Measuring Requirements 3.7.1. Fluorescence Measurement 3.7.2. Measuring Equipment for Polarimetry, ORD, and CD 3.7.3. Reflection Measurement 3.7.4. Ellipsometry 3.8. Effect of Equipment Parameters 3.9. Connection to Electronic Systems and Computers 4. Uses of UV ‐ VIS Spectroscopy in Absorption, Fluorescence, and Reflection 4.1. Identification of Substances and Determination of Structures 4.2. Quantitative Analysis 4.2.1. Determination of Concentration by Calibration Curves 4.2.2. Classical Multicomponent Analysis 4.2.3. Multivariate Data Analysis 4.2.4. Use in Chromatography 4.3. Fluorimetry 4.3.1. Inner Filter Effects 4.3.2. Fluorescene and Scattering 4.3.3. Excitation Spectra 4.3.4. Applications 4.4. Reflectometry 4.4.1. Diffuse Reflection 4.4.2. Color Measurement 4.4.3. Regular Reflection 4.4.4. Determination of Film Thickness 4.4.5. Ellipsometry 4.5. Resonance Methods 4.5.1. SurfacePlasmon Resonance 4.5.2. Grating Couplers 4.5.3. Other Evanescent Methods 4.5.4. Interferometric Methods 4.6. On‐Line Process Control 4.6.1. Process Analysis 4.6.2. Measurement of Film Thicknesses 4.6.3. Optical Sensors 4.7. Measuring Methods Based on Deviations from the Lambert – Beer Law 5. Special Methods 5.1. Derivative Spectroscopy 5.2. Dual‐Wavelength Spectroscopy 5.3. Scattering 5.3.1. Turbidimetry 5.3.2. Nephelometry 5.3.3. Photon Correlation Spectroscopy 5.4. Luminescence, Excitation, and Depolarization Spectroscopy, and Measurement of Lifetimes 5.5. Polarimetry 5.5.1. Sugar Analysis 5.5.2. Cellulose Determination 5.5.3. Stereochemical StructuralAnalysis 5.5.4. Use of Optical Activity Induced by a Magnetic Field 5.6. Photoacoustic Spectroscopy (PAS)

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Dynamic Infrared Linear Dichroism of Polymers†Much of this material was based on Chapter 21 in “Fourier Transform Infrared Spectrometry”, Second Edition, by P. R. Griffiths and J. A. de Haseth, Wiley Interscience, Hoboken (2007).

Cited by 224 publications

References 18 publications

Identification and Preservation of Cultural Heritage

Identification and Preservation of Cultural Heritage

THz and mid-IR spectroscopy of interstellar ice analogs: methyl and carboxylic acid groups

Ultraviolet and Visible Spectroscopy

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