Richard A. Larsen


FT-IR Microscopic Analysis of Polymer Laminate Samples Including Transmission and ATR Spectroscopy

August 01, 2016

Polymer laminates typically make complex samples for infrared analysis, comprising multiple layers with defined thicknesses, in some cases less than 10 µm. When measuring extremely narrow laminate layers, the use of attenuated total reflectance (ATR) may provide improved spectra of the laminate cross-section, because ATR microscope objectives offer a greater spatial resolution than transmission due to additional magnification. This paper details the preparation of polymer laminate sample cross-sections and the collection of transmission and ATR spectra of various layers. Further analysis of the laminate spectra will also be explored utilizing a multivariate curve resolution (MCR) algorithm. An example laminate sample is examined utilizing all the tools available on a standard FT-IR microscope.

Evaluation of Eye Shadow Compounds Using Raman Microspectroscopy

June 01, 2016

Cosmetic preparations are common consumer products that consist of various organic and inorganic materials. In this paper, a method for the identification and spatial discrimination of the components in eye shadow samples using laser Raman microspectroscopy is described. The use of a multivariate curve resolution (MCR) is utilized during the analysis of the cosmetic preparation mapping data to develop the spatial discrimination information presented within this note.

Raman Analysis of Embedded Contaminants

March 18, 2015

Raman confocal spectroscopy is increasingly being applied for the analysis of embedded contaminants within materials. A non-contact, non-destructive analysis method, Raman spectroscopy requires very little sample preparation, has greater spatial resolution compared to FT-IR microscopy and the confocal analysis method allows visualization of materials within a clear sample matrix. This paper will investigate the analysis of an embedded contaminant within a polymer matrix on a glass substrate.

Gemstone Identification Using Raman Spectroscopy (PDF)

April 01, 2004

Raman microspectroscopy is an ideal method for the examination of marketable gemstones because of the lack of sample preparation involved and the nondestructive nature of Raman analysis.