Thesis (Ph. D.)--University of Chicago, 1931. / "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois."

Berlin, Freie Universiẗat, Diss., 2004. / Dateiformat: zip, Dateien im PDF-Format.

This work involved preparation of cyclical dimeric or trimeric gallazanes of general formula: (RNHGaH₂)[subscript n omitted] where n= 2 or 3 and R = Et, Pr[superscript n omitted], Pr[superscript i omitted], Bu[superscript n omitted], Bu[superscript i omitted], Bu[superscript s omitted], or Bu[superscript t omitted]. The effect of larger R group on ring size ( n value ) was determined. Some deuterated analogues of these compounds were also prepared. These were (EtNHGaD₂)₃, (Bu[superscript t omitted]NHGaD₂)₂, and (Pr[superscript i omitted]NHGaD₂)₂. Attempted preparation of ØNHGaH₂ resulted in isolation of ØNH.GaH₂.NMe₃. Reactions were undertaken with ØNH.GaH₂.NMe₃ and it partially deuterated analogue ØNHGaD₂.NMe₃, and shown to involve proton transfer through a 4-centre transition state. Additional work on the effects of R group on the nitrogen within the gallazanes involved preparation of dimeric gallazanes of general formula ((CH₂)[subscript x omitted].N.GaH₂)₂ where x = 2,3,4 or 5. Additional work on double ring systems involved preparation of analogous alazanes of general formula ((CH₂)[subscript x omitted]N.AlH₂)[subscript n omitted] where x = 2,3,4,5 and n = 2 or 3. Similar borazanes were likewise prepared and were of general formula: ((CH₂)[subscript x omitted].N.BH₂)[subscript n omitted] where x = 2,3,4, 5 and n = 2 or 3. Adducts of general formula: (CH₂)₂NH.EMe₃ where E = B, Al, Ga, In, were also prepared. Upon pyrolysis these adducts yield methane plus materials of the general formula: ((CH₂)₂N.EMe₂)₃ where E = Al,Ga, In. Characterization of these materials as well as gaseous reaction products was accomplished by infrared spectroscopy. Additional data was obtained by 60MHz and 100MHz 'H nmr as well as mass spectrometry. Molecular weights were determined cryoscopically in benzene and analyses for galluim, aluminum or hydrolysable hydrogen carried out by standard means. / Science, Faculty of / Chemistry, Department of / Graduate

The nuclear magnetic resonance spectrum of gallium metal has been investigated in single crystal specimens in both low and high magnetic fields from 4.2°K to the melting point (T[subscript MP] = 300°K) and then extended to the liquid phase. Precise determinations for the two non-equivalent nuclear sites have been made of (a) the electric field gradient (EFG) tensor and (b) the Knight shift (K) tensor. The relationship of these results to the crystal structure of gallium metal is discussed in detail. The isotopic Knight shift in the solid, K[superscript sol; subscript iso] increases linearly with temperature from (0.132±0.004)% at 4.2°K to (0.155±0.004)% just below T[subscript MP]. In the liquid, just above T[subscript MP], K[superscript liq; sucscipt iso] = (0.453±0.003)% and decreases very slowly with increasing temperature. These results are discussed in terms of the Korringa relations in the solid and liquid phases, respectively. Implications of these results are developed with regard to changes in the electronic structure of gallium upon melting. The angular dependence of K[subscript an] agrees with the predicted angular dependence for the Knight shift anisotropy in an orthorhombic environment and is described with two anisotropy parameters defined as K₁ and K₂. No K- anisotropy is found along the Y (B crystal) axis. The principal axes of the K tensor have different signs from the quadrupolar principle axes. K[subscript an] (X) is found to be very large, i.e. K[subscript an] (X)/K[subscript iso] = -18% at 77°K, and temperature dependent. Increasing the temperature (T) from 4.2°K, K[subscript an] (X) increases to a maximum at 77°K and then slowly decreases as T approaches T[subscript MP] where it still retains a large value. This paradoxical behaviour is assumed to be a result of particular and unusual details of the gallium Fermi surface. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 208-216). Also available via the Internet.

No description available.

Heidelberg, Univ., Diss., 2008.

Thesis (M.S. in Applied Physics)--Naval Postgraduate School, December 2009. / Thesis Advisor(s): Haegel, Nancy M. Second Reader: Luscombe, James. "December 2009." Description based on title screen as viewed on January 27, 2010. Author(s) subject terms: Transport imaging, minority carrier, GaN nanowires, diffusion length, near-field scanning optical microscopy, NSOM. Includes bibliographical references (p. 63-64). Also available in print.

Zugl.: Karlsruhe, Univ., Diss., 2004. / Computerdatei im Fernzugriff.

Th. doct.-ing.--Nancy, I.N.P.L., 1979.