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Fran Adar
Articles
A Simple Introduction to Raman Spectral Identification of Organic Materials
November 01, 2021
Innovative database search technology can help Raman spectroscopists identify molecular vibrations; here, we show how to use these tools more effectively.
Effect of Sampling Optics on Raman Depth Profiling
June 01, 2021
We illustrate how matching the optical properties of the microscope objective with the sample properties improves the spatial resolution and chemical speciation in depth profile measurements using confocal Raman microscopy.
Assignment of Raman Bands of a Set of Biopolymers with Small Increases in an Added Functional Group
February 01, 2021
Raman spectra were measured in combination with 2D-COS analysis to understand how the addition of propyl side groups to a biopolymer backbone influences the structure of the polymer at the atomic level.
Very Low Frequency Measurements of Linear Alkanes
November 01, 2020
Low frequency Raman scattering measurements can be used to predict physical properties of polymers and the crystalline polymorphic form of active pharmaceutical ingredients (APIs). These measurements are made by recording the Stokes and anti-Stokes side of the laser line with the laser centered on the detector. Spectra of polyethylene and linear alkanes were recorded down to 4 cm-1.
Use of Raman Microscopy to Characterize Extractables and Leachables
February 01, 2020
Raman microscopy, combined with X-ray fluorescence, can provide detailed information about extractables and leachables from medically implantable devices.
Raman Analysis of Ethylene Vinyl Acetate Copolymers–Using 2D-COS for Identifying Structural Changes
November 01, 2019
Raman 2D-COS spectral data provide information on conformational changes of polymers. Here, Raman spectra of ethylene vinyl acetate and vinyl acetate copolymer are measured and interpreted, enabling a description of morphological changes related to the vinyl acetate group.
Measurement of the Temperature Dependence of Water Using a Near-Infrared Raman Spectrograph
June 01, 2019
The spectral behavior of water is studied using Raman with an NIR spectrograph and dual wavelength lasers for measurements of both the fingerprint and the OH stretching regions. Raman spectra are recorded between 5 ⁰C and 80 ⁰C, and treated with both band-fitting and the 2D-COS algorithm revealing improved insights into the spectral behavior of water.
Use of Raman Spectroscopy and 2D-COS for the Detection and Characterization of Chemical Interactions
February 01, 2019
Two-dimensional correlation spectroscopy (2D-COS) can reveal subtle chemical interactions that are difficult to discern when analyzing individual spectra. A demonstration of the subtleties of this technique can be seen in the analysis of ethanol–water and ethanol–methanol mixtures.
Heterocorrelation Using Polarized Raman Spectra in the Characterization of Polymers
November 01, 2018
Spectral changes revealed by two-dimensional correlation spectroscopy can be used to interpret structural changes in polymers determined by processing conditions, so that materials can be rationally engineered for particular applications with known mechanical requirements.
Carotenoids—Their Resonance Raman Spectra and How They Can Be Helpful in Characterizing a Number of Biological Systems
June 01, 2017
The resonance Raman spectra of carotenoids vary with subtle changes on the functional side groups, making these spectra useful for identifying and characterizing carotenoids.