Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598454
Title: Kinetic investigation of atomic rubidium and caesium by time-resolved laser-induced fluorescence
Author: De Silva, K. M. N.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1998
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Abstract:
This dissertation is concerned with characterising the collisional behaviour of the heavier alkali elements, rubidium and caesium atoms, in their 2S1/2 electronic ground states at elevated temperatures by time-resolved laser-induced fluorescence (LIF). This thesis is comprised of six chapters. Chapter one provides a general introduction of the gas phase kinetic study of alkali atoms in their 2S/1/2 ground states, particularly in the time-resolved mode. Chapter two gives an account of the detailed description of the apparatus used for the present investigation for studying the atomic reactions of Rb and Cs at elevated temperatures by time-resolved LIF following pulsed irradiation. Chapter three describes the determination of absolute second-order rate constants for the collisional removal of Rb(52S1/2) with a wide range of alkyl chlorides (CH3Cl, C2H5Cl, C3H7Cl, C4H9Cl, C5H11Cl, C6H13Cl and C7H15Cl), fluoralkyl chlorides (CF3Cl, CF2Cl2 and CFCl3) and other simple chlorine-containing molecules (CH2Cl2, CHCl3 and CCl4). Chapter four describes the collisional behaviour of Rb(52S1/2) with a series of alkyl bromides (CH3Br, C2H5Br, C3H7Br, C4H9Br, C5H11Br, and C6H13Br), and other simple bromine and iodine-containing-molecules (CF3Br, CH2Br2, C2H4Br2, CH3I and CH2I2) at elevated temperature. Chapter five includes the detailed investigation of the oxidation reaction between Rb(52S1/2) and N2O as a function of temperature over a limited range accessible with this system. This chapter also describes the reactions of Rb(52S1/2) with CH3Cl, CH3Br and CF3Cl as a function of temperature. Despite the limitations with this system, these are the first temperature dependent studies of the Rb + CH3Cl, CH3Cl, CH3Br and CF3Cl systems investigated by time-resolved LIF. Chapter six describes the determination of absolute second-order rate constants for the collisional removal of Cs(62S1/2) with a series of alkyl chlorides (CH3Cl, C3H7Cl, C4H9Cl, C5H11Cl, C6H13Cl and C7H15Cl) and alkyl bromides (C3H7Br, C4H9Br, C5H11Br, C6H13Br and C7H15Br) investigated by time-resolved laser-induced fluorescence at elevated temperatures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.598454  DOI: Not available
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