Quantitative approach to the sample contact problem in attenuated total reflection spectroscopy: Theoretical considerations

Stuchebryukov, S. D.; Rudoy, V. M.

doi:10.1016/0924-2031(92)87017-a

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Precedent for surface roughness potentially influencing orientation measurements can be found by noting several examples where its effects have been at least qualitatively considered, including contact angles, , fluorescence , and fluorescence depolarization, − attenuated total internal reflection infrared spectroscopy, , electrochemical blocking, , neutron − and X-ray − reflectivity, X-ray fluorescence, , and ellispometry . As one example, in neutron reflectivity studies, Li et al and Lu et al , demonstrated that amphiphile orientation at air−liquid interfaces could only be properly determined after correcting for the interface roughness.…”

Section: Introduction/backgroundmentioning

confidence: 99%

Molecular Orientation at Surfaces: Surface Roughness Contributions to Measurements Based on Linear Dichroism

Simpson

Rowlen

1999

J. Phys. Chem. B

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The molecular orientation at surfaces plays a key role in many of the interesting optical properties of organic thin films. Accurate determination of molecular “tilt” angles and the distribution in tilt angles is essential for an improved understanding of performance characteristics, i.e., the structure−function relationship. While there are several spectroscopic techniques available for measurement of molecular orientation at solid surfaces, little effort has been dedicated to understanding the contributions of surface roughness on measured orientation values. In this paper, following an overview of spectroscopic techniques and previous approximations of surface roughness effects, a quantitative theory for treating surface roughness contributions to molecular orientation measurements made by linear dichroism is presented. The theory is sufficiently general that it may be extended to other spectroscopic techniques, such as second-harmonic generation. It is anticipated that knowledge of the molecular orientation with respect to the local surface (i.e., accounting for surface roughness) will provide a better understanding of the orientation in organic thin films.

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Section: Introduction/backgroundmentioning

confidence: 99%

Molecular Orientation at Surfaces: Surface Roughness Contributions to Measurements Based on Linear Dichroism

Simpson

Rowlen

1999

J. Phys. Chem. B

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“…4 Over the years, efforts have been made to enhance the equipment's capability to achieve better contact and identify situations where contact is poor. [5][6][7] While liquid samples typically provide good optical contact with the IRE, soft and rubbery solid samples may require pressure to achieve good contact. Hard and rigid solid samples, on the other hand, do not always make good contact with the IRE, especially if the IRE in use cannot support high pressures, and an unknown gap between the two media may remain.…”

Section: Introductionmentioning

confidence: 99%

Overcoming the Contact Problem in Quantitative Attenuated Total Reflection Spectroscopy Analysis of Flat Samples

Vieira

2023

Appl Spectrosc

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A method for measuring the optical functions of a flat sample made of homogeneous and isotropic material, using attenuated total reflection spectroscopy when there is poor contact between the sample and the internal reflection element is presented. The approach consists in treating the spacing between the internal reflection element and the sample as an adjustable parameter, along with the dispersion model parameters, in the simultaneous fitting of s- and p-polarized spectra obtained when the gap distance is unknown. The method is tested with both synthetic and experimental (polystyrene) spectra. The results demonstrate the method's ability to accurately determine the optical functions even in the presence of a contact problem.

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Mid-infrared spectroscopy for food analysis: recent new applications and relevant developments in sample presentation methods

Wilson

Tapp

1999

TrAC Trends in Analytical Chemistry

109

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Quantitative approach to the sample contact problem in attenuated total reflection spectroscopy: Theoretical considerations

Cited by 4 publications

References 4 publications

Molecular Orientation at Surfaces: Surface Roughness Contributions to Measurements Based on Linear Dichroism

Molecular Orientation at Surfaces: Surface Roughness Contributions to Measurements Based on Linear Dichroism

Overcoming the Contact Problem in Quantitative Attenuated Total Reflection Spectroscopy Analysis of Flat Samples

Mid-infrared spectroscopy for food analysis: recent new applications and relevant developments in sample presentation methods

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