Analytical applications of Raman spectroscopy
Abstract
This thesis is a compilation of work done in several different areas, with Raman spectroscopic instrumentation and techniques as the unifying theme. Part One focuses on the development of the CCD-based micro-Raman device used in this work. A calibration function is derived that relates the monochromator wavelength dispersion to CCD pixel number. Frequency accuracy and long-term repeatability of the Raman spectra with respect to internal or external standards are also discussed. Part Two describes the information that can be obtained from the analysis of Raman spectra. The dependence of the vibrational frequency of a molecule on pressure is used as a micro-barometer. Temperature of the analyte is studied by Stokes/anti-Stokes intensity ratio. The intensity of the signal is shown to correspond to film thickness for liquid samples. Part Three describes applications of the techniques detailed in Part Two. Minor applications include the use of Raman to detect the presence and location of inhomogeneities in a scattering medium, and the potential of Raman as a method of material identification for plastics recycling. However, the majority of this section is devoted to probing the physical properties of the fluid lubricant film present between a bearing and its housing. Comparisons with previous experimental work as well as theoretical models are given.
Degree
Ph.D.
Advisors
Ben-Amotz, Purdue University.
Subject Area
Analytical chemistry|Mechanical engineering|Plastics
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