251 |
Isotopic oxygen exchange reactions on magnesium oxideMellor, Ian January 1999 (has links)
No description available.
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252 |
Optical and magnetic studies of p-i-n resonant tunnelling devicesEvans, Bryn January 1995 (has links)
No description available.
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253 |
Photoionization of oriented molecules : angle resolved photoelectron photoion coincidenceDownie, Peter January 1997 (has links)
No description available.
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254 |
A study of defects and impurities in diamondTwitchen, Daniel January 1997 (has links)
No description available.
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255 |
Spectroscopic studies of AM her type systemsMukai, K. January 1986 (has links)
No description available.
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256 |
Nonlinear optical spectroscopy of semiconductorsFox, A. M. January 1987 (has links)
No description available.
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257 |
Ruthenium(II) and rhenium(I) bipyridine receptors for the recognition of anions and ion pairsUppadine, Lindsay January 2000 (has links)
No description available.
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258 |
Spectroscopic and theoretical studies of intermolecular forcesGellert, P. R. January 1988 (has links)
No description available.
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259 |
A study of the 2S Lamb shift of one-electron ions in an electron beam ion trapGroves, Paul David January 1996 (has links)
No description available.
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260 |
A nuclear magnetic resonance study of hydrous layer silicatesAlmond, Graham G. January 1995 (has links)
This is a study of five silicates, namely makatite, kanemite, octosilicate, magadiite and kenyaite. The silicates have been analysed using a range of techniques, principally solid-state NMR spectroscopy. High-quality (^29)Si NMR spectra have been obtained for samples of all five layered sodium polysilicate hydrates. Amongst other findings, these have revealed four crystallographically distinct sites in makatite and a Q(^4):Q(^4) site ratio in kenyaite of ca. 5. Proton MAS NMR studies can produce well-resolved spectra, particularly for carefully-dried samples. Distinct water and strongly hydrogen-bonded proton species have been detected. The latter are particularly noteworthy and they are present in kanemite, octosilicate, magadiite and kenyaite, but not in makatite or layered silicic acids. Interactions between the resolved proton species have been investigated with a series of 1- and 2-dimensional experiments resulting in the detection of mixing, via spin-diffusion or chemical exchange. Sodium-23 NMR studies were complicated by second-order effects from strong quadrupolar interactions and the presence of a significant signal from a sodium chloride contamination in many samples. The latter had fooled previous authors. Acidification products of kanemite, octosilicate and magadiite were characterised by (^29)Si CP NMR, thermogravimetric analysis, 1H MAS NMR and powder X-ray diffraction. A single H-kanemite sample proved to be H(_2)Si(_2)O(_5), but two types of H-octosilicate and H-magadiite sample were prepared. These differed in the presence of interlayer water. Several CP experiments were used to investigate the relationship between (^29)Si and (^23)Na nuclei and protons in the silicates. Cross-polarisation mechanisms tended to involve magnetisation transfer from the H-bonded protons only. Their determination was possible with a consideration of the extent of spin-diffusion or chemical exchange over the time-scale of the relevant experiments. Finally, new model structures for kanemite and the interlayer space in kanemite, octosilicate, magadiite and kenyaite have been suggested, while previously- proposed silicate layers have been reconsidered.
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