Novel developments in and applications of Raman spectroscopy
Novel developments in and applications of Raman spectroscopy
Three projects concerning the developments and applications of Raman spectroscopy were studied: (1) In the first project a new Raman technique utilizing the Evanescent Wave of an Optical Fibre (EWOF) as a source for Raman spectroscopy was developed. This study showed that Raman spectra of thin films and surfaces can be recorded by using the EWOF technique. However, the quality of the recorded spectra is poor and this is explained by the evanescent nature of the source which is limited to the fibre core/sample interface. In another experiment, it was demonstrated that a new Waveguide Raman Spectroscopy method using optical fibres produces good Raman spectra of thin layers deposited onto the fibre core. (2) The study of Fourier Transform Raman Intensity clearly showed that excellent intensity reproducibility can be obtained and suggests that Raman spectra routinely recorded can now be published against a meaningful intensity scale rather than the usual arbitrary units scale. Relative scattering cross-sections obtained with the Fourier transform Raman spectrometer are in good agreement with the already published Raman scattering cross-sections determined with conventional Raman spectrometers. An attempt to determine correction factors, such as the refractive index dependent solid angle correction and the local field effect, was also carried out. It was shown that the overall effect of both correction factors is negligible. As a consequence, plots of Raman intensity versus molarity for liquids in binary mixtures were found to be linear and to pass through the origin. (3) A study of PVC gels below, through and above the gel-solution transition temperature using spectroscopic analytical methods showed that the crosslinks of the polymer network consist of all-trans extended syndiotactic sequences. No evidence of crystalline structure forming the crosslinks was observed in the course of this study.
University of Southampton
1989
Jawhari, Tariq
(1989)
Novel developments in and applications of Raman spectroscopy.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Three projects concerning the developments and applications of Raman spectroscopy were studied: (1) In the first project a new Raman technique utilizing the Evanescent Wave of an Optical Fibre (EWOF) as a source for Raman spectroscopy was developed. This study showed that Raman spectra of thin films and surfaces can be recorded by using the EWOF technique. However, the quality of the recorded spectra is poor and this is explained by the evanescent nature of the source which is limited to the fibre core/sample interface. In another experiment, it was demonstrated that a new Waveguide Raman Spectroscopy method using optical fibres produces good Raman spectra of thin layers deposited onto the fibre core. (2) The study of Fourier Transform Raman Intensity clearly showed that excellent intensity reproducibility can be obtained and suggests that Raman spectra routinely recorded can now be published against a meaningful intensity scale rather than the usual arbitrary units scale. Relative scattering cross-sections obtained with the Fourier transform Raman spectrometer are in good agreement with the already published Raman scattering cross-sections determined with conventional Raman spectrometers. An attempt to determine correction factors, such as the refractive index dependent solid angle correction and the local field effect, was also carried out. It was shown that the overall effect of both correction factors is negligible. As a consequence, plots of Raman intensity versus molarity for liquids in binary mixtures were found to be linear and to pass through the origin. (3) A study of PVC gels below, through and above the gel-solution transition temperature using spectroscopic analytical methods showed that the crosslinks of the polymer network consist of all-trans extended syndiotactic sequences. No evidence of crystalline structure forming the crosslinks was observed in the course of this study.
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Published date: 1989
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Local EPrints ID: 461619
URI: http://eprints.soton.ac.uk/id/eprint/461619
PURE UUID: dfd86695-7d9d-4b33-bab0-c746c1b29c87
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Date deposited: 04 Jul 2022 18:51
Last modified: 04 Jul 2022 18:51
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Author:
Tariq Jawhari
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