Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637100
Title: Development studies of concentration modulated absorption spectroscopy
Author: Griffiths, T. R.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1991
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Abstract:
The development of the concentration modulated absorption spectroscopy (C.O.M.A.S.) is detailed from 1986-1989. The theory has been developed which allows excited state lifetimes to be measured in the range 50ps to 100ns, using dye lasers mode locked at 82 MHz. Lifetimes in the range 10ns to 10ms can be measured using the C.O.M.A.S. technique and continuous wave (c.w.) lasers. A boule of synthetic Ruby has been analysed, using the C.O.M.A.S. technique. The lifetime of the 2E state has been measured, and the concentration of the Chromium ions within the matrix determined. Both values were found to be in agreement with literature values. The study of solutions of transition metal complexes (Iron and Chromium), was complicated by the effects of sample diffusion. The C.O.M.A.S. theory (for c.w. lasers) has been extended to include these effects. Comparison of the theoretical and experimental results is made. Both pulsed and c.w. lasers have been used to investigate the d.c. discharge generated by an Iron Neon hollow cathode lamp. The lifetimes of a number of excited states within Neon have been measured. The concentration of the excited states has been determined with good spatial resolution. The concentration measurements have allowed excitation and de excitation rates for the discharge to be evaluated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.637100  DOI: Not available
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