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  • Laser Cooling Trapping of Metastable Neon and Applications to Collision Measurements

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    Matherson_2010_02Thesis.pdf (14.49Mb)
    Author(s)
    Matherson, Kristen
    Primary Supervisor
    Sang, Robert
    Other Supervisors
    Pryde, Geoff
    Lohmann, Birgit
    Year published
    2010
    Metadata
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    Abstract
    This thesis presents a new technique for measuring total absolute collision cross sections. Using this technique, the total absolute collision cross sections were determined for neon in the (3s)3P2 metastable state with ground state thermal atoms and molecules. A magneto-optical trap (MOT) is used in this technique which infers the cross sections via the measurement of population dynamics within the MOT to determine the collision cross section. This technique is capable of providing benchmark measurements of total absolute collision cross sections. The measurements are unique for the low average collision energy which ranges ...
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    This thesis presents a new technique for measuring total absolute collision cross sections. Using this technique, the total absolute collision cross sections were determined for neon in the (3s)3P2 metastable state with ground state thermal atoms and molecules. A magneto-optical trap (MOT) is used in this technique which infers the cross sections via the measurement of population dynamics within the MOT to determine the collision cross section. This technique is capable of providing benchmark measurements of total absolute collision cross sections. The measurements are unique for the low average collision energy which ranges between 11meV and 27meV for the dierent collision species and relatively low uncertainty of approximately 9.4%. The measurements were for neon in the (3s)3P2 metastable state with He, Ne, Ar, H2, O2, N2 and CO2. The measured cross sections were respectively 160±20Å2, 500±50Å2, 840±80Å2, 230±20Å2, 1000±100Å2, 1300.0±100Å2, 830±80Å2. The measurements made using this technique have small uncertainties, of the order of 10% of the measured cross section. As Ne* does not have the energy to ionize He, the Ne*-He collision was entirely elastic and the validity of this technique was conrmed by comparing the experimental result for this collision with an approximation for the elastic collision cross section based on van der Waals forces. The calculation based on this approximation yielded an elastic cross-section of 168.88Å2 for the Ne*-He system. This theoretical value compared favourably and within the uncertainties of the experimental measurement for the Ne*-He collision of 160±20Å2. To be able to perform these investigations a rebuild and partial redesign of the Griffith University metastable neon trapping apparatus was necessary and was included in this work.
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    Thesis Type
    Thesis (PhD Doctorate)
    Degree Program
    Doctor of Philosophy (PhD)
    School
    School of Biomolecular and Physical Sciences
    DOI
    https://doi.org/10.25904/1912/3023
    Copyright Statement
    The author owns the copyright in this thesis, unless stated otherwise.
    Item Access Status
    Public
    Note
    Markup retained because this is a "jump"/"link" to chapter.
    Subject
    total absolute collision cross sections
    Magneto-optical trap
    metastable
    neon
    Publication URI
    http://hdl.handle.net/10072/367097
    Collection
    • Theses - Higher Degree by Research

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