Attenuated Total Reflection<scp>F</scp>ourier Transform Infrared Spectroscopy

Ramer, Georg; Lendl, Bernhard

doi:10.1002/9780470027318.a9287

Cited by 49 publications

(68 citation statements)

References 64 publications

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“…2A and B). Furthermore, as previously reported [78], ATR yielded betterresolved and more detailed spectra than reflection. Comparing the substrates (aluminium or glass), results were obtained using ATR and reflection on aluminium, but, as expected, only ATR yielded good quality spectra on glass, due to the highly absorbing nature of this substrate.…”

Section: Initial Composition Of Fingermarkssupporting

confidence: 81%

Fingermark initial composition and aging using Fourier transform infrared microscopy (μ-FTIR)

Girod

Xiao

Reedy

et al. 2015

Forensic Science International

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This study investigated fingermark residues using Fourier transform infrared microscopy (μ-FTIR) in order to obtain fundamental information about the marks' initial composition and aging kinetics. This knowledge would be an asset for fundamental research on fingermarks, such as for dating purposes. Attenuated total reflection (ATR) and single-point reflection modes were tested on fresh fingermarks. ATR proved to be better suited and this mode was subsequently selected for further aging studies. Eccrine and sebaceous material was found in fresh and aged fingermarks and the spectral regions 1000-1850cm(-1) and 2700-3600cm(-1) were identified as the most informative. The impact of substrates (aluminium and glass slides) and storage conditions (storage in the light and in the dark) on fingermark aging was also studied. Chemometric analyses showed that fingermarks could be grouped according to their age regardless of the substrate when they were stored in an open box kept in an air-conditioned laboratory at around 20°C next to a window. On the contrary, when fingermarks were stored in the dark, only specimens deposited on the same substrate could be grouped by age. Thus, the substrate appeared to influence aging of fingermarks in the dark. Furthermore, PLS regression analyses were conducted in order to study the possibility of modelling fingermark aging for potential fingermark dating applications. The resulting models showed an overall precision of ±3 days and clearly demonstrated their capability to differentiate older fingermarks (20 and 34 days old) from newer ones (1, 3, 7 and 9 days old) regardless of the substrate and lighting conditions. These results are promising from a fingermark dating perspective. Further research is required to fully validate such models and assess their robustness and limitations in uncontrolled casework conditions.

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Section: Initial Composition Of Fingermarkssupporting

confidence: 81%

Fingermark initial composition and aging using Fourier transform infrared microscopy (μ-FTIR)

Girod

Xiao

Reedy

et al. 2015

Forensic Science International

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“…This ATR crystal configuration comprises 20 active bounces and a depth of penetration (per bounce) of 420 nm at 1500 cm -1 (nGe=4.02, nsample=1.33). 8,35,36 The ATR crystals were inserted into a custom-made mount and fixed with a FKM O-ring and an aluminum liquid flow cell with a volume of ca. 20 µL.…”

Section: Optical Setup For Ftir Spectroscopymentioning

confidence: 99%

“…Attenuated total reflection (ATR) IR spectroscopy is commonly employed for spectroscopic studies of aqueous samples. 8 It was demonstrated that the sensitivity of this technique can be vastly increased using selective enrichment layers coated on ATR crystals that cover the volume probed by the evanescent field. [9][10][11] Until now, they have been primarily employed for enriching apolar substances into hydrophobic coatings.…”

Section: Introductionmentioning

confidence: 99%

A pocket-sized 3D-printed attenuated total reflection-infrared filtometer combined with functionalized silica films for nitrate sensing in water

Baumgartner

Freitag

Gasser

et al. 2020

Sensors and Actuators B: Chemical

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Strong anion-exchange materials carry a positive charge that allows them to trap and concentrate anions while releasing other anions. Here, we introduced an ion exchange group into mesoporous silica films coated on attenuated total reflection (ATR) crystals to enrich nitrate from aqueous phase in the volume probed by the evanescent field. The ion-exchange and enrichment capabilities of the films were characterized using standard FTIR spectroscopy. Thereby fast analyte enrichment and full sensor recovery were observed. In addition, high enrichment factors of up to 1600 were achieved. After characterization, these coated ATR crystals were used in a dedicated ATR-IR filtometer comprising a Fabry-Pérot filter detector unit and a miniaturized thermal emitter with a footprint of only 80 mm × 120 mm × 70 mm. The filter covered the spectral region between 1250 -1800 cm -1 allowing for recording IR spectra of nitrate enriched into the mesoporous silica film. The sensor was calibrated using the Langmuir adsorption model as calibration function. From this, a limit of detection of 1.2 mg L -1 was derived for the ATR-IR filtometer.This emphasizes the high potential of functionalized mesoporous silica films combined with low-cost filtometers for portable water sensors.

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“…72,194,198 The exponential decay of Eev results from the fact that the wave-vector of the incident electric field becomes imaginary beyond the interface. [199][200][201] The evanescent wave Eev is the central quantity in ATR spectroscopy, which is in variance to transmission experiments, where plane waves are considered. Due to its non-propagating nature in the z-direction, a few differences exist with respect to the local electric fields between ATR spectroscopy and transmission experiments, as discussed in the following.…”

Section: D Attenuated Total Reflectance Ir Spectroscopymentioning

confidence: 99%

“…The highest field strengths occur near θc, while close to an AOI of 90° all field intensities approach zero. 203,205,199,205 Furthermore, in case of absorbing media, the refractive index of the sample (n2) becomes complex-valued. As a result, θc is not sharply defined anymore and a more gradual increase of the reflectivity occurs with AOIs farther away from θc.…”

Section: D Attenuated Total Reflectance Ir Spectroscopymentioning

confidence: 99%

Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy

2016

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Ultrafast two-dimensional infrared spectroscopy (2D IR) has been advanced in recent years toward measuring signals from only a monolayer of sample molecules at solid-liquid and solid-gas interfaces. A series of experimental methods has been introduced, which in the chronological order of development are 2D sum-frequency-generation (2D SFG), transmission 2D IR, and reflection 2D IR, the latter in either internal, attenuated total reflection (ATR), or external reflection configuration. The different variants of 2D vibrational spectroscopy are based on either the even-order or the odd-order nonlinear susceptibility, and all allow resolving similar molecular temporal and spectral information. In this review, we introduce the basic principles of the different methods of 2D vibrational spectroscopy at surfaces along with a balanced overview on the technological aspects as well as benefits and shortcomings. We furthermore discuss the current scope of applications for 2D vibrational surface spectroscopy, which spans an impressively broad range of samples from biological molecules to heterogeneous catalysts. The emphasis is on the ultrafast structural dynamics of molecules at interfaces, environmental interactions, and intermolecular interactions. We furthermore consider important recent technological developments of 2D vibrational surface spectroscopy, which employ (i) surface enhancement, (ii) methods for studying electrochemical interfaces, and (iii) extensions for resolving nonequilibrium processes (transient 2D IR). A detailed outlook is finally given regarding important future applications and technological developments of 2D vibrational surface spectroscopy.

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Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Cited by 49 publications

References 64 publications

Fingermark initial composition and aging using Fourier transform infrared microscopy (μ-FTIR)

Fingermark initial composition and aging using Fourier transform infrared microscopy (μ-FTIR)

A pocket-sized 3D-printed attenuated total reflection-infrared filtometer combined with functionalized silica films for nitrate sensing in water

Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy

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