New developments in Fourier Transform Raman spectroscopy and their applications
New developments in Fourier Transform Raman spectroscopy and their applications
The field of FT-Raman spectroscopy has grown tremendously since the experiments by Hirschfeld & Chase in 1986. Similar to the growth of dispersive Raman, FT-Raman is now diversifying into shorter and longer excitation wavelengths as well as novel modulated excitation techniques. This thesis presents the design and application of some of these new approaches.
An investigation is made into the design and development of the first Ti:sapphire laser based FT-Raman instrument. The problems of self absorption, high temperature environments and their effect on Raman spectra are discussed. The design and construction of a low noise, low cost detection system is examined. The first high temperature FT-Raman spectra at 300oC are also presented with the implications on detector design given.
Novel laser modulation techniques using a modified diode pumped Nd:YAG laser operating at 1064 nm are investigated. The removal of thermal backgrounds using amplitude modulation and temporal discrimination of pulsed laser excitation is demonstrated. A study of signal to noise improvements using a gain switched laser is shown with results approaching the background shot noise limit. The limitations of each technique are analysed in detail.
The Ti:sapphire FT-Raman system is used to investigate the temperature effects on the Raman spectra of some chlorobenzenes. The data is analysed and compared using both univariate and multivariate methods.
The effects of polarisation modulation excitation is presented using the tools developed in the laser modulation studies. A method to lower the background shot noise limit of the NIR Raman experiment to theoretical visible levels using a tuneable laser is presented.
University of Southampton
Bennett, Robert
7f2a031b-5d4c-4112-a451-440c9460e169
1996
Bennett, Robert
7f2a031b-5d4c-4112-a451-440c9460e169
Bennett, Robert
(1996)
New developments in Fourier Transform Raman spectroscopy and their applications.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The field of FT-Raman spectroscopy has grown tremendously since the experiments by Hirschfeld & Chase in 1986. Similar to the growth of dispersive Raman, FT-Raman is now diversifying into shorter and longer excitation wavelengths as well as novel modulated excitation techniques. This thesis presents the design and application of some of these new approaches.
An investigation is made into the design and development of the first Ti:sapphire laser based FT-Raman instrument. The problems of self absorption, high temperature environments and their effect on Raman spectra are discussed. The design and construction of a low noise, low cost detection system is examined. The first high temperature FT-Raman spectra at 300oC are also presented with the implications on detector design given.
Novel laser modulation techniques using a modified diode pumped Nd:YAG laser operating at 1064 nm are investigated. The removal of thermal backgrounds using amplitude modulation and temporal discrimination of pulsed laser excitation is demonstrated. A study of signal to noise improvements using a gain switched laser is shown with results approaching the background shot noise limit. The limitations of each technique are analysed in detail.
The Ti:sapphire FT-Raman system is used to investigate the temperature effects on the Raman spectra of some chlorobenzenes. The data is analysed and compared using both univariate and multivariate methods.
The effects of polarisation modulation excitation is presented using the tools developed in the laser modulation studies. A method to lower the background shot noise limit of the NIR Raman experiment to theoretical visible levels using a tuneable laser is presented.
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Published date: 1996
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Local EPrints ID: 463095
URI: http://eprints.soton.ac.uk/id/eprint/463095
PURE UUID: 9ea7b184-018c-4bc9-be52-0360388c32c5
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Date deposited: 04 Jul 2022 20:44
Last modified: 04 Jul 2022 20:44
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Author:
Robert Bennett
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