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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Performance advantages of maximum likelihood methods in prbs-modulated time-of-flight electron energy loss spectroscopy /

Yang, Zhongyu, January 2003 (has links) (PDF)
Thesis (Ph. D.) in Physics--University of Maine, 2003. / Includes vita. Includes bibliographical references (leaves 153-158).
22

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) characterization of conformation and orientation of adsorbed protein films /

Xia, Nan. January 2003 (has links)
Thesis (Ph. D.)--University of Washington, 2003. / Vita. Includes bibliographical references (leaves 164-178).
23

INVESTIGATION OF NEUTRON SLOWING-DOWN DYNAMICS

Rooney, V. (Vernon) January 1970 (has links)
No description available.
24

A cross-beam time-of-flight study of metastable helium in collisions with helium, neon, and argon

Fiering, Kenneth Barratt January 1981 (has links)
No description available.
25

Photodissociation of atmospherically important species

Tyley, Phillip L. January 2000 (has links)
The photodissociation of ozone by ultraviolet light has a great impact on the photochemistry of the atmosphere. The relative quantum yield for the production of the singlet atomic fragment O(<sup>1</sup>D) has been determined in the wavelength region 306 to 327 nm for four temperatures between 227 K and 300 K. The technique of resonance enhanced multi photon ionisation (REMPI) was used to probe directly the O(<sup>1</sup>D) photolysis product. These relative measurements have been placed onto an absolute scale by the selection of a calibration point whose value has been agreed by the scientific community. The yields obtained are in good agreement with others reported during the time of the research reported in this thesis and clearly show that three mechanisms contribute to the final quantum yield. Below 310 nm, O(<sup>1</sup>D) is produced by a spin-allowed channel, above 320 nm the primary channel is a spin- forbidden one and at intermediate wavelengths photolysis of vibrationally excited ozone contributes to the O(<sup>1</sup>D) yield. Elements of the quantum yield data presented in this thesis are being included in a new recommendation for the temperature dependent O(<sup>1</sup>D) quantum yield. Details of the dissociation kinetics, including further evidence confirming the spin-forbidden channel, is presented in time-of-flight studies of the O(<sup>1</sup>D) product. Time-of-flight profiles taken between 317 and 321 nm show evidence that, at room temperature, the O(<sup>1</sup>D) quantum yield is anti-correlated with the ozone absorption cross section. Excitation of the O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) co-fragment has been observed at wavelengths below 296 nm by monitoring the energies of the O(<sup>1</sup>D) formed. As the channel for the production of O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>,andnbsp;vandnbsp;=andnbsp;1) opens, it is found that energy is preferentially partitioned into rotation of the O<sub>2</sub> fragment rather than into translation. Initial studies on the O(<sup>1</sup>D) fragment have shown that the fragment is orbitally aligned and that the choice of REMPI transition can have a significant effect on the time-of-flight profiles and therefore on the measurements that are made from the profiles. The time-of-flight profiles obtained by probing the O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) photofragment have shown that the O<sub>2</sub>(a<sup>1</sup>Δ<sub>g</sub>) has an angular momentum polarisation that is J dependent, with the even J being strongly polarised and the odd J depolarised. This results in the shape of the time-of-flight profiles being a function of the REMPI laser polarisation; and the study of this behaviour has been used to confirm the assignments in highly perturbed REMPI spectra.
26

Laser-assisted secondary ion mass spectroscopy and its applications in practical surface analysis

Karahan, Mehmet Cem. January 2004 (has links) (PDF)
Thesis (M.S.)--Montana State University--Bozeman, 2004. / Typescript. Chairperson, Graduate Committee: David Dickensheets. Includes bibliographical references (leaves 94-95).
27

Identification of an enolase protein in sarcocystis neurona by the use of two-dimensional electrophoresis and MALDI-ToF analysis /

Wilson, Aliya. January 2004 (has links)
Thesis (M.S.)--University of Missouri--Columbia, 2004. / "May 2004." Typescript. Includes bibliographical references (leaves 30-40). Also issued on the Internet.
28

Characterization of adsorbed protein films using time of flight secondary ion mass spectrometry and multivariate analysis /

Wagner, Matthew Scott. January 2002 (has links)
Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 317-343).
29

Studies of electrospray /

Ding, Luyi, January 1900 (has links)
Thesis (Ph. D.)--Carleton University, 2000. / Also available in electronic format on the Internet.
30

Identification of an enolase protein in sarcocystis neurona by the use of two-dimensional electrophoresis and MALDI-ToF analysis

Wilson, Aliya. January 2004 (has links)
Thesis (M.S.)--University of Missouri--Columbia, 2004. / Typescript. Includes bibliographical references (leaves 30-40). Also issued on the Internet.

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