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Title: Infrared diode laser spectroscopy of transient species
Author: Hunt, N. T.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2000
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The introduction discusses the advantages of using lasers as opposed to conventional light sources for spectroscopic applications. Lasers output light of a monochromatic nature, enabling extremely high-resolution measurements to be made, whilst their high power engenders excellent sensitivity. These properties are essential for the application of the ion specific velocity modulation technique employed extensively in this work. The development of tuneable infrared sources, especially the semiconductor diode laser, is also described. Also discussed are experimental methods for generating transient species in the laboratory. A review of previous spectroscopic measurements of transient species is then presented with particular attention being paid to ionic and boron-containing species, which form the main focus of the experimental work presented here. A diode laser velocity modulation spectrometer equipped with an ac electric discharge has been used to study such short-lived species in the experiments reported in this thesis, and is described in chapter 2. Chapter 2 presents the infrared spectrum of the transient molecule BBr. Over 150 lines consisting of both fundamental and hot bands up to v"=5 have been fitted to Watson's isotopically invariant coefficients (Ukl). In Chapter 4 the infrared spectrum of HBC1+ and HBBr+ is presented. Both ions have been observed in the infrared for the first time and spectroscopic constants are obtained for ground and first excited vibrational states of some of the more naturally abundant isotopomers. Ab initio calculations have been performed for HBBr+ based upon the experimental data obtained for HBC1+. Chapter 5 presents the observation of the v1 fundamental band of C1BO recorded on a different spectrometer incorporating a multi-pass White Cell and microwave discharge while Chapter 6 discusses the origin of some apparently unassignable lines observed in discharges containing argon, hydrogen and helium.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available