New Results for Positron Scattering from Noble Gas Atoms and Diatomic Molecules PDF Download
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Author: Joan Phyllis Marler
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Author: Joan Phyllis Marler
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Author: Walter E. Kauppila
Publisher:
ISBN: 9789814542432
Category : SCIENCE
Languages : en
Pages : 373
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Author: Joshua Reuben Machacek
Publisher:
ISBN:
Category : Atoms
Languages : en
Pages : 256
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Book Description
Low energy positron scattering has been conducted for over 40 years and large discrepancies (> 20%) in the measured cross sections have plagued both experimental and theoretical results. The advent of the Surko buffer-gas trap has provided for sufficiently large numbers of positrons, with previously unmatched angular and energy distributions, which has allowed for the measurement of absolute cross sections with absolute uncertainties of less than 10%. Continual improvement of the experimental techniques has allowed for the separation of the partial scattering channels. These results are crucial for testing our theoretical understanding of the scattering process and for modeling of positron transport in complex systems. The experiments reported in this thesis used a scattering apparatus which incorporated a radiative sodium-22 source of positrons that were moderated using solid neon and cooled further by a Surko buffer-gas trap. Those positrons were subsequently scattered from various atomic and molecular gases in a cylindrical scattering cell. Scattered and unscattered positrons emerging from the scattering cell were energy analysed with a retarding potential analyser to determine their energy loss, which enabled the determination of various scattering cross sections. Absolute elastic differential, grand total, total elastic, total inelastic and positronium formation scattering cross sections for energies between 1 and 200 eV are presented for a number of atomic and molecular species. Where possible, knowledge of the experimental limitations are combined with theoretical calculations to estimate the amount of the angular scattering missed due to the finite angular resolution of the experiment. Comparison of both grand total and partial total cross sections are compared to a number of theoretical calculations and previous experimental results, again where possible. A rotating electric field, or 'rotating-wall' electrode, was implemented to increase the central density of the positron beam. The operational phase space was explored in the context of the standard running parameters of this Surko-trap system used for atomic and molecular scattering experiments. Mechanisms for compression are reviewed in the context of applicability to the operational parameters of the trap and in the understanding of the dominant mechanism. The limitations in the implementation are discussed in regard to scattering experiments from atoms and molecules.
Author: John W. Humberston
Publisher: Springer Science & Business Media
ISBN: 1461327512
Category : Science
Languages : en
Pages : 230
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The first conference in this series, devoted principally to the interaction of positrons in gases, was held at York University, Toronto, in July 1981 immediately preceding the XII ICPEAC in Gatlinburg, and the proceedings were published in the Canadian Journal of Physics, volume 60 (1982). So successful was this meeting that the decision was taken to hold a second one around the time of XIII ICPEAC in Berlin in 1983. London was clearly a convenient location but, rather than the obvious choice of University College London in central London, the Organising Committee decided that the beautiful and peaceful surroundings of Royal Holloway College would provide a more pleasant and intimate atmosphere for a small meeting. Even a small conference requires substantial sums of money to pay the expenses of invited speakers and when considering possible sources of funds the Organising Committee recognised that the intended format of the meeting and the international composition of the participants made it appropriate to apply to the NATO Science Committee for support under the Advanced Research Workshop Programme. This was one of the few successful applications made this year, and so it was that the conference became the 'NATO Advanced Research Workshop on Positron Scattering in Gases'. The Workshop, with approximately sixty participants, started after lunch on 19 July, 1983 and finished at mid-day on 23 July.
Author: Walter E Kauppila
Publisher: World Scientific
ISBN: 9813201851
Category :
Languages : en
Pages : 373
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This workshop discusses the current state and future directions of research in positron — gas scattering, particularly in the relationship between positron and electron scattering by the same atoms and molecules. The possible applications of positron — gas scattering to astrophysical phenomena have also been discussed.
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 844
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1112
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Author: Walter E. Kauppila
Publisher: World Scientific Publishing Company Incorporated
ISBN: 9789971978976
Category : Science
Languages : en
Pages : 353
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Author: Sharon Gilmore
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 834
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