Internal Reflection and ATR Spectroscopy

Milošević, Milan

doi:10.1081/asr-200030195

Cited by 92 publications

(114 citation statements)

References 6 publications

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“…To calculate the reflection at an interface to an absorbing medium, the refractive index n 2 in the Fresnel equations simply has to be replaced by its complex counterpartn 2 . (16) The relations between the intensity of the incident and the reflected light, expressed as reflection coefficient R, therefore are …”

Section: Reflection Total Reflection and The Attenuated Total Reflementioning

confidence: 99%

“…For weakly absorbing samples, an approximate d e can be calculated from A = [− log 10 (e)4πk]/λ 0 d e = log 10 (R) using first-order approximations in k (1,3) :…”

Section: E(d P )mentioning

confidence: 99%

“…Hence, assuming constant values for n 1 and n 2 , bands with the same absorption coefficient will appear higher at lower wavenumbers than at higher wavenumbers ( Figure 18). To make the relative band intensities more similar to those in transmission spectra, the measured absorptions in ATR spectra can be multiplied by the according wavenumber (1) :…”

Section: Wavelengthmentioning

confidence: 99%

“…(1) IR light traveling in an optically denser medium is totally reflected at the interface to an optically rarer medium. Although the light rays as such do not propagate into the optically rarer medium, an evanescent field forms there.…”

Section: Introduction To Attenuated Total Reflection Spectroscopymentioning

confidence: 99%

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Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Ramer

Lendl

2013

Encyclopedia of Analytical Chemistry

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Attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectroscopy is now the most widespread implementation of mid‐infrared (MIR) spectroscopy. While the FTIR technique allows the fast and stable collection of MIR spectra, the ATR technique allows mechanically stable, robust, and quick sampling. ATR‐FTIR spectroscopy is routinely used in industrial and research laboratories. The ATR‐FTIR technique finds application in, e.g. biology, medicine, forensics, process analytical chemistry and organic chemistry. Even though ATR spectroscopy is often treated as a routine technique, it has several intricacies that users should be aware of to avoid measurement errors and artifacts. In this article, starting from the theoretical underpinnings of ATR spectroscopy, we aim to give novices in ATR‐FTIR spectroscopy the knowledge to successfully use this technique and to avoid common errors. The theoretical treatment of ATR spectroscopy is complemented by practical information about the routine and advanced uses of ATR spectroscopy. Furthermore, the reader will find descriptions of future trends in ATR‐FTIR and evanescent wave spectroscopy. Finally, a list of literature for further reading and a list of vendors of ATR accessories and their product lines are given to facilitate using the ATR technique.

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Section: Reflection Total Reflection and The Attenuated Total Reflementioning

confidence: 99%

“…For weakly absorbing samples, an approximate d e can be calculated from A = [− log 10 (e)4πk]/λ 0 d e = log 10 (R) using first-order approximations in k (1,3) :…”

Section: E(d P )mentioning

confidence: 99%

Section: Wavelengthmentioning

confidence: 99%

Section: Introduction To Attenuated Total Reflection Spectroscopymentioning

confidence: 99%

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Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Ramer

Lendl

2013

Encyclopedia of Analytical Chemistry

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“…Compared to transmission cells, time-resolved ATR-FTIR provides a more versatile and simple method to measure CMT, a key parameter that determines mesophase synthesis conditions and long-range ordering [2]. In ATR spectroscopy [6], the infrared beam undergoes total internal reflection through a crystal in contact with the sample. The evanescent wave established beyond the interface penetrates into the sample a short distance, from tenths to several microns, which depends on the diffraction indexes of the 2…”

Section: Introductionmentioning

confidence: 99%

Dynamics of PEO-PPO-PEO block copolymer aggregation and silicate mesophase formation monitored by time-resolved ATR-FTIR spectroscopy

Sánchez

Pérez‐Pariente

Márquez‐Álvarez

2008

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The use of the attenuated total reflectance (ATR) technique to perform time-resolved FTIR spectroscopy analysis of the synthesis of SBA-15 silicate is reported. This spectroscopy is a powerful technique to investigate the assembly of surfactants and silicate species as well as surfactant micellization, as infrared bands are sensitive to local polarity and conformation of the surfactant chains. Critical micellization temperature (CMT), a key parameter that determines mesophase synthesis conditions and long-range ordering, is determined by in situ time-resolved ATR-FTIR under the conditions used to synthesize the mesophase. This technique allows also to determine the dynamics of the hydrolysis and condensation reactions of the silicate precursor.

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Applications of Internal Reflection Spectroscopy in Forensic Analysis

Koçak

2016

Forensic Science

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Internal Reflection and ATR Spectroscopy

Cited by 92 publications

References 6 publications

Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Dynamics of PEO-PPO-PEO block copolymer aggregation and silicate mesophase formation monitored by time-resolved ATR-FTIR spectroscopy

Applications of Internal Reflection Spectroscopy in Forensic Analysis

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