The development and applications of near infrared Fourier transform Raman spectroscopy
The development and applications of near infrared Fourier transform Raman spectroscopy
Details of the construction of a near infrared Fourier transform Raman spectrometer based on an analytical grade Infrared Absorption instrument are presented. The discussion includes considerations of the excitation laser, sampling cells, optical collection geometry and detection systems. Improvements in optical filtering techniques are presented which derive from devices constructed in collaboration with specialist manufactuerers. The first spectra of gas samples recorded using a routine analytical FT Raman system are presented. A general method, based on the measurement of blackbody radiation from a laboratory furnace, is proposed for the correcting of measured spectra for the effects of the instrument response function. High reproducibilities in the measurement of spectral intensities are demonstrated, even when samples are removed from the instrument between measurements. It is proposed that this suggests the use of an external standard method of quantifying intensities, and it is further demonstrated that a reliable intensity scale, for the examination of liquids by FT Raman, is available if spectral intensities are presented relative to the intensity of a standard band in Hexachlorobutadiene. The effects of self absorption are investigated and explanation is given for the recently published observations of Everall and Lumsdon. Results are presented of the first use of a pulsed laser system for excitation in an FT Raman instrument. The considerable advantages gained over continuous wave excitation, allow Raman spectra to be recorded from previously difficult or impossible samples and illustrative examples are presented throughout. Improvements on the initial design are investigated, and potential future work is discussed.
University of Southampton
Petty, Christopher Joseph
1991
Petty, Christopher Joseph
Petty, Christopher Joseph
(1991)
The development and applications of near infrared Fourier transform Raman spectroscopy.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Details of the construction of a near infrared Fourier transform Raman spectrometer based on an analytical grade Infrared Absorption instrument are presented. The discussion includes considerations of the excitation laser, sampling cells, optical collection geometry and detection systems. Improvements in optical filtering techniques are presented which derive from devices constructed in collaboration with specialist manufactuerers. The first spectra of gas samples recorded using a routine analytical FT Raman system are presented. A general method, based on the measurement of blackbody radiation from a laboratory furnace, is proposed for the correcting of measured spectra for the effects of the instrument response function. High reproducibilities in the measurement of spectral intensities are demonstrated, even when samples are removed from the instrument between measurements. It is proposed that this suggests the use of an external standard method of quantifying intensities, and it is further demonstrated that a reliable intensity scale, for the examination of liquids by FT Raman, is available if spectral intensities are presented relative to the intensity of a standard band in Hexachlorobutadiene. The effects of self absorption are investigated and explanation is given for the recently published observations of Everall and Lumsdon. Results are presented of the first use of a pulsed laser system for excitation in an FT Raman instrument. The considerable advantages gained over continuous wave excitation, allow Raman spectra to be recorded from previously difficult or impossible samples and illustrative examples are presented throughout. Improvements on the initial design are investigated, and potential future work is discussed.
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Published date: 1991
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Local EPrints ID: 460635
URI: http://eprints.soton.ac.uk/id/eprint/460635
PURE UUID: 92604e3f-8f7b-4d2e-b260-a172c426430a
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Date deposited: 04 Jul 2022 18:26
Last modified: 04 Jul 2022 18:26
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Author:
Christopher Joseph Petty
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