Rice Univesrity Logo
    • FAQ
    • Deposit your work
    • Login
    View Item 
    •   Rice Scholarship Home
    • Rice University Graduate Electronic Theses and Dissertations
    • Rice University Electronic Theses and Dissertations
    • View Item
    •   Rice Scholarship Home
    • Rice University Graduate Electronic Theses and Dissertations
    • Rice University Electronic Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Studies of oriented molecules using coincidence time-of-flight mass spectroscopy

    Thumbnail
    Name:
    9928613.PDF
    Size:
    6.258Mb
    Format:
    PDF
    View/Open
    Author
    Wiediger, Susan D.
    Date
    1999
    Advisor
    Brooks, Philip R.
    Degree
    Doctor of Philosophy
    Abstract
    A beam of symmetric top (CX3Y) molecules is state-selected using an inhomogeneous hexapole electric field and then oriented by homogeneous electric fields. A fast neutral atomic potassium beam produced via charge-exchange crosses the molecular beam at a right angle. Continuous electric fields extract ion pair products as they are formed into dual time-of-flight (TOF) mass spectrometers, where the arrival time difference is characteristic of the mass difference of the particles. The positive product (K+) is known for these reactions, allowing identification of the negative products based on the time difference. Construction of the dual time-of-flight (TOF) mass spectrometers is described, with an explanation of how coincidence detection is used to identify the negative ion products of reactions between fast neutral K atoms and small molecules (≤7 atoms). Examination of the results of initial characterization studies including reactions with CH3Cl, CH3Br, CH3I, CF 3Br, and SF6 indicate that coincidence TOF should be a powerful tool for investigations into the dynamics of these reactions. Preliminary results suggest that orientation data will be obtainable to address the question of whether different approach vectors result in different product channels. The importance of a well-calibrated alkali source, well-defined electric fields, and a good vacuum is indicated. An appendix discusses radio-frequency (RF) spectroscopy experiments performed to explore characteristics of the rotational distribution in the molecular beam. A possible application of RF spectroscopy to "tag" single quantum states is discussed.
    Keyword
    Physical chemistry
    Citation
    Wiediger, Susan D.. "Studies of oriented molecules using coincidence time-of-flight mass spectroscopy." (1999) Diss., Rice University. https://hdl.handle.net/1911/19458.
    Metadata
    Show full item record
    Collections
    • Rice University Electronic Theses and Dissertations [13409]

    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map

     

    Searching scope

    Browse

    Entire ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsTypeThis CollectionBy Issue DateAuthorsTitlesSubjectsType

    My Account

    Login

    Statistics

    View Usage Statistics

    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map