Determination of Anisotropic Optical Constants and Surface Coverage of Molecular Films Using Polarized Visible ATR Spectroscopy. Application to Adsorbed Cytochrome <i>c</i> Films

Runge, Anne F.; Rasmussen, Nicole C.; Saavedra, S. Scott; Mendes, Sergio B.

doi:10.1021/jp051465k

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This approach has also been extended to the characterization of aniostropic materials. 29,30 For IR transmission spectra, particularly for samples diluted in an IR-transparent matrix such as KBr, the imaginary part of the refractive index is readily obtained (albeit with altered local field effects) and can be related to the absorption coefficient. 29,31 ATR-IR spectra, however, trade-off sample measurement convenience for some additional complexity in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Infrared Refractive Index of Polymers from a Calibrated Attenuated Total Reflection Infrared Measurement

2022

View full text Add to dashboard Cite

We demonstrate a straightforward method by which a commonly available reference sample such as water can be used to calibrate an attenuated total internal reflection infrared absorbance measurement in order to account for the polarization of the beam incident on the internal reflecting element, and the spread of angles about the nominal angle of incidence. This enables quantitative comparison of ATR-derived absorbance data with spectra calculated from optical constants. We then apply this calibration to the measurement of temperature-dependent absorption spectra of a polydimethylsiloxane sample. We illustrate that the extracted optical constants scale with the temperature-dependent changes in the polymer density better than the raw absorbance values on vibrational resonance.

show abstract