• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Characterization of ion-molecule reactions and rotational relaxation in a free jet expansion.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_td_9114063_sip1_m.pdf
    Size:
    4.572Mb
    Format:
    PDF
    Description:
    azu_td_9114063_sip1_m.pdf
    Download
    Author
    Mazely, Troy Louis.
    Issue Date
    1990
    Keywords
    Chemistry
    Physics.
    Advisor
    Smith, Mark A.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Our group has recently developed and characterized a novel free jet flow reactor in which molecular reaction dynamics are studied in the c::old c::ore of a pulsed free jet expansion. Extremely low translational temperatures, often less than 1 K, are obtained with no condensation problems that exist in cryogenic cooling techniques. The reaction is initiated in the expansion and the species are monitored in the frame of the flowing free jet as a function of time. Kinetic information is obtained from a temporal profile of the mass and density distributions in the expansion. A free jet expansion is not at thermal equilibrium. The consequence of thermal anisotropy between different degrees of freedom must be addressed when properly analyzing free jet kinetic data. A detailed kinetic treatment has been developed which, within the accurate flow model of the jet adopted, rigorously accounts for the thermal anisotropy in the expansion. Approximations to the convoluted exact expressions are then made to aid in experimental application. Astrophysica1ly important bimolecular reactions of C⁺ were measured. The rate coefficients are reported and compared to current capture models. For the reactions with only two exothermic channels. branching ratios are determined. To understand the realistic flow dynamics present in our free jet flow reactor a solution to the Boltzmann Equation for a multi-component atomic expansion was derived. Both velocity and temperature slip are naturally incorporated into the model. To better understand the internal cooling in molecular expansions. rotational state population distributions were obtained in the core of a free jet for both pure and mixed mixtures of N₂ by means of 2+2 REMPI. Spectral fitting shows no evidence for non-Boltzmann behaviour in the rotational populations. The experimental results fit well to a solution of the generalized Boltzmann equation.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Chemistry
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.