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Measuring Reaction Rates

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...

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Updated: Oct 7, 2025

Author Spotlight: Advances in Nanoscale Infrared Spectroscopy to Explore Multiphase Polymeric Systems

Author Spotlight: Advances in Nanoscale Infrared Spectroscopy to Explore Multiphase Polymeric Systems

Published on: June 23, 2023

Towards Real-Time In-Situ Mid-Infrared Spectroscopic Ellipsometry in Polymer Processing.

Alexander Ebner¹, Robert Zimmerleiter¹, Kurt Hingerl²

¹RECENDT-Research Center for Non-Destructive Testing GmbH, 4040 Linz, Austria.

|January 11, 2022

Summary

This summary is machine-generated.

Quantum cascade laser (QCL) mid-infrared ellipsometry offers faster, high-resolution polymer analysis. This advanced technique enables real-time in-situ monitoring of polymer structure and reorientation during processing.

Keywords:

ellipsometry in-line monitoring mid-infrared spectroscopy polymer films polymer processing quantum cascade laser real-time

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Published on: January 26, 2016

Area of Science:

Materials Science
Spectroscopy
Polymer Science

Background:

Conventional mid-infrared (MIR) spectroscopic ellipsometry using thermal emitters has long acquisition times.
Recent advancements in quantum cascade lasers (QCLs) have significantly improved signal-to-noise ratios in MIR spectroscopy.

Purpose of the Study:

To demonstrate the benefits of QCL-based MIR ellipsometry for polymer analysis.
To showcase the potential for real-time in-situ monitoring in polymer processing.

Main Methods:

Utilized a QCL-based MIR ellipsometer for spectroscopic analysis.
Investigated single and multilayered polymer films, including polyethylene terephthalate and polyethylene/ethylene vinyl alcohol/polyethylene.
Monitored molecular reorientation during a polymer stretching process.
Performed varying angle spectroscopic ellipsometry on multilayer films.

Main Results:

Reduced acquisition times from hours to under 1 second for high-resolution spectra.
Successfully monitored molecular reorientation in real-time during a 24.5-second stretching process.
Achieved unprecedented sample throughput for varying angle MIR ellipsometry, analyzing a multilayer film in 17.2 seconds.

Conclusions:

QCL-based MIR ellipsometry provides superior spectral and temporal resolution compared to conventional methods.
This technique is well-suited for advanced in-situ monitoring in dynamic polymer processing applications.