Probing Properties of Glassy Water and Other Liquids with Site Selective Spectroscopies Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.

Title

  • Main Title Probing Properties of Glassy Water and Other Liquids with Site Selective Spectroscopies

Creator

  • Author: Dang, Nhan Chuong
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of Science.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Science (SC)

Publisher

  • Name: Ames Laboratory
    Place of Publication: Ames, Iowa
    Additional Info: AMES (Ames Laboratory (AMES), Ames, IA)

Date

  • Creation: 2005-08-12

Language

  • English

Description

  • Content Description: The standard non-photochemical hole burning (NPHB) mechanism, which involves phonon-assisted tunneling in the electronically excited state, was originally proposed to explain the light-induced frequency change of chemically stable molecules in glassy solids at liquid helium temperatures by this research group more than two decades ago. The NPHB mechanism was then further elucidated and the concept of intrinsic to glass configurational relaxation processes as pre-mediating step to the hole burning process was introduced. The latter provided the theoretical basis for NPHB to evolve into a powerful tool probing the dynamics and nature of amorphous media, which aside from ''simple'' inorganic glasses may include also ''complex'' biological systems such as living cells and cancerous/normal tissues. Presented in this dissertation are the experimental and theoretical results of hole burning properties of aluminum phthalocyanine tetrasulphonate (APT) in several different matrices: (1) hyperquenched glassy water (HGW); (2) cubic ice (I{sub c}); and (3) water confined into poly(2-hydroxyethylmethacrylate) (poly-HEMA). In addition, results of photochemical hole burning (PHB) studies obtained for phthalocyanine tetrasulphonate (PcT) in HGW and free base phthalocyanine (Pc) in ortho-dichlorobenzene (DCB) glass are reported. The goal of this dissertation was to provide further evidence supporting the NPHB mechanism and to provide more insight that leads to a better understanding of the kinetic events (dynamics) in glasses, and various dynamical processes of different fluorescent chromorphores in various amorphous solids and the liquid that exist above the glass transition temperature (T{sub g}). The following issues are addressed in detail: (1) time evolution of hole being burned under different conditions and in different hole burning systems; (2) temperature dependent hole profile; and (3) the structure/dynamics of water in confined space, which has been studied, in part because of the importance of non-freezable water in biological systems.
  • Physical Description: 5,988KB

Subject

  • Keyword: Aluminium
  • Keyword: Water
  • STI Subject Categories: 37 Inorganic, Organic, Physical And Analytical Chemistry
  • Keyword: Kinetics
  • Keyword: Phthalocyanines
  • Keyword: Matrices
  • Keyword: Glass
  • Keyword: Excited States
  • Keyword: Transition Temperature
  • Keyword: Relaxation
  • Keyword: Tunneling
  • Keyword: Helium

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Thesis or Dissertation

Format

  • Text

Identifier

  • Report No.: IS-T 2674
  • Grant Number: W-7405-Eng-82
  • Office of Scientific & Technical Information Report Number: 850147
  • Archival Resource Key: ark:/67531/metadc787911