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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.
61

A Vertical Coarse Approach Scanning Tunneling Microscope

Drevniok, BENEDICT 25 June 2009 (has links)
A Pan-style scanning tunneling microscope (STM), with a vertical coarse approach mechanism, was designed, built and tested. The microscope will be operated in ultra-high vacuum and also at cryogenic temperatures (8 K) inside a continuous flow cryostat. Fundamental differences in operating principle exist between the new microscope and the beetle-type inertial sliders [1] that have been the mainstay of the group for the last eight years. While Pan-style microscopes do already exist [2], they remain challenging to build, and an active area of research [3]. This system represents a bold departure from well-trodden paths, and will greatly expand the range of experiments that our group can perform. The operating principles of inertial piezoelectric motors are detailed. Design guidelines for a piezoelectric motor are given, and used in the design of the vertical coarse approach motor. A simple, inexpensive implementation for creating waveforms with an extremely fast fall time is discussed. Motor performance is tested, and a minimum step size of 20nm is found for frequencies ranging from 0 Hz to 3 kHz. The motor operates with high dynamic range: individual 20nm steps can be taken, as well as being able to move at a velocity of 0.4mm s−1. Little is known about the vibrational properties of Pan-style microscopes. Vibrational testing of the microscope revealed the expected scanner bending mode at 1.6 kHz (above the scanner bending mode of our beetles at 1.2 kHz), and a complicated response signal above this frequency. Custom extension springs for an eddy-current damping system are built and tested. A low resonant frequency of 1.8 Hz is found, which is ideal for the application. Initial testing of the STM in ambient conditions is performed on two different surfaces. A moir´e supermesh [4] with periodicity 3nm is observed on a highly-oriented pyrolytic graphite (HOPG) surface, and agrees well with previously published results. Using a flame-annealed Gold on mica surface, a low drift rate of 0.6nm s−1 is observed over a period of 13 minutes. Single-height atomic steps are observed on both surfaces. Additionally, the microscope is shown to be capable of zooming into different features on a surface, and scanning at different length scales. / Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2009-06-24 13:06:16.683
62

Relaxation dynamics of labyrinthine submonolayer films

Katsuno (Matsumoto), Kiiko, Uwaha, Makio, Irisawa, Toshiharu, Okano, Masakazu, Sudoh, Koichi 03 1900 (has links)
No description available.
63

Scanning tunneling microscopy of complex electronic materials

Tomic, Aleksandra T. January 2008 (has links)
Thesis (Ph.D.)--Michigan State University. Dept. of Physics and Astronomy, 2008. / Title from PDF t.p. (viewed on Mar. 27, 2009) Includes bibliographical references (p. 95-102). Also issued in print.
64

Adaptation and application of morphological pseudoconvolutions to scanning tunneling and atomic force microscopy /

Weisman, Andrew D. January 1991 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1991. / Spine title: Application of morphological pseudoconvolutions to STM images. Includes bibliographical references.
65

Laser scanning microscopy of broad freezing interfaces with applications to biological cells /

Neils, Christopher Martin, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 203-215). Available also in a digital version from Dissertation Abstracts.
66

Interactions between adsorbates and a stepped metallic surface studied with scanning tunneling microscopy and low energy electron diffraction /

Pearl, Thomas Patrick. January 2000 (has links)
Thesis (Ph. D.)--University of Chicago, Department of Chmistry, August 2000. / Includes bibliographical references. Also available on the Internet.
67

Electron transport in mesoscopic metallic structures /

Purbach, Ulrich, January 1999 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 102-106). Available also in a digital version from Dissertation Abstracts.
68

Low temperature scanning tunneling microscope study of metallic thin films and nanostructures on the semiconductor substrates

Qin, Shengyong, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
69

Ultra high vacuum low temperature scanning tunneling microscope for single atom manipulation on molecular beam epitaxy grown samples /

Clark, Kendal. January 2005 (has links)
Thesis (M.S.)--Ohio University, June, 2005. / Includes bibliographical references (p. 46-50)
70

Ultra high vacuum low temperature scanning tunneling microscope for single atom manipulation on molecular beam epitaxy grown samples

Clark, Kendal. January 2005 (has links)
Thesis (M.S.)--Ohio University, June, 2005. / Title from PDF t.p. Includes bibliographical references (p. 46-50)

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