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      • HARVEST
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      A Knudsen cell for controlled deposition of L-cysteine and L-methionine on Au(111)

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      Date
      2006-11-20
      Author
      Dubiel, Evan Alozie
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      This thesis details the development of expertise and tools required for the study of amino acids deposited on Au(111), with a primary focus on the design and testing of a Knudsen cell for controlled deposition of L-cysteine and L-methionine. An ultra-high vacuum preparation chamber designed by Dr. Katie Mitchell and built by Torrovap Industries Inc. was installed. This chamber is connected to the existing scanning tunneling microscopy chamber via a gate valve, and both chambers can operate independently. Various instruments such as a mass spectrometer, quartz crystal microbalance, ion source, and sample manipulator were installed on the preparation chamber. Scanning tunneling microscopy was performed on both homemade and commercial Au(111) thin films. High resolution images of "herringbone" reconstruction and individual atoms were obtained on the commercial thin films, and optimal tunneling conditions were determined. A Knudsen cell was designed to be mounted on the preparation chamber. The Knudsen cell operates over the temperature range 300-400K, with temperatures reproducible to ±0.5K, and stable to ±0.1K over a five minute period. Reproducible deposition rates of less than 0.2Å/s were obtained for both L-cysteine and L-methionine. Electron impact mass spectrometry and heat of sublimation measurements were performed to characterize the effusion of L-cysteine and L-methionine from the Knudsen cell. The mass spectrometry results suggest that L-cysteine was decomposing at 403K while L-methionine was stable during effusion. Heats of sublimation of 168.3±33.2kJ/mol and 156.5±10.1kJ/mol were obtained for L-cysteine and L-methionine respectively.
      Degree
      Master of Science (M.Sc.)
      Department
      Physics and Engineering Physics
      Program
      Physics and Engineering Physics
      Supervisor
      Mitchell, Caroline E. J. (Katie)
      Committee
      Paige, Matthew F.; Moewes, Alexander; McWilliams, Kathryn A.; Manson, Alan; Bradley, Michael P.
      Copyright Date
      November 2006
      URI
      http://hdl.handle.net/10388/etd-11172006-133611
      Subject
      knudsen cosine law
      Amino Acids
      Metal Surfaces
      Scanning Tunneling Microscopy
      Mass Spectrometry
      quartz crystal microbalance
      self-assembled monolayers
      alkanethiols
      adsorption
      effusion
      proteins
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