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Title: Reactions of carbon and germanium atoms in specific electronic states by resonance absorption spectroscopy in the time-domain
Author: Ioannou, A. X.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1997
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A new body of absolute rate data is been reported for the collisional removal of ground state germanium atoms, Ge(43Pj) with 17 olefins and 10 acetylenes. The rate data derived from the present measurements have employed atomic monitoring of a group of spin-orbit components of the atom. This yields results which are significantly slower than those obtained from the measurements on individual spin-orbit components of germanium with some of the smaller organic reactants, in particular, for GE(43Pj). Kinetic data with other reactants, mainly simple molecules, have primarily indicated Boltzmann equilibrium during reaction from the equality of decay rates for the individual spin-orbit states in Ge(43P0,1,2). These present results are in contrast to previous analogues measurements on C(3Pj) and Si(3Pj) where, for Si(3Pj) in particular, rate data for the spin-orbit manifold overall was found to be consistent with those obtained for specific measurements on Si(3P0,1,2) and is discussed in further detail. The collisional quenching of electronically excited germanium atoms, Ge(41So), 2.029 eV above the ground state, has been investigated with 13 small molecules, employing time-resolved atomic resonance absorption spectroscopy in ultra-violet. In contrast to previous investigations using the "single-shot" mode at high energy, Ge(1S0) has been generated by the repetitive pulsed irradiation of Ge(CH3)4 at low energy and using signal averaging techniques, which increases the signal-to-noise ratio. The current results are compared with previous data for Ge(1S0) derived in the "single-shot" mode where there is general agreement though with some exceptions which are discussed in the appropriate chapter of the thesis. Finally, a large new body of absolute rate data is reported for the collisional quenching of Ge(41S0) in the presence of 16 alkenes and 9 alkynes. It is shown that the rate data are dominated by the polarisability of the colliding molecule within the context of the simplified model using a classical capture theory.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available