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An E.S.R. spectrometer for the study of transient paramagnetic species

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This thesis is concerned with a description of work carried out in the design, development and use of suitable equipment to be utilised with an Electron Spin Resonance Spectrometer and a Computer of Average Transients in order to record E.S.R. spectra of transient paramagnetic species.
The first part of the thesis contains a basic outline of the theory of E.S.R. and a description and discussion of E.S.R. spectrometers.
There follows a discussion on signal to noise considerations with particular emphasis on the device known as the phase sensitive detector (P.S.D.) with a natural transition to averaging systems which play an important part in a rapid recording spectrometer.
An explanatory review of various methods of recording data on transient paramagnetic species is included, along with the reasons for the development of the particular system utilised by the author.
A description of the apparatus used is included with a detailed description of the design, development and testing of the information processing equipment.
A brief analysis of the E.S.R. spectra of atomic oxygen is given, followed by a description and discussion of the results obtained on the kinetics of their formation and decay processes, in an r.f. discharge, observed as a test sample for an assessment of the equipment.
The concluding chapter discusses the relative merits of the author's system in particular and the advantages and disadvantages of rapid recording systems in general. A final discussion of the possible improvements and alternative versions of the present system is included, along with a technique using an on line computer in conjunction with a fast record slow playback (F.R.S.P.) device to record and present all the relevant data as a “3 dimensional" display.

Publication Date Nov 1, 1967


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