Accession Number : ADA264753


Title :   Development of an 0 Atom Gun


Descriptive Note : Final rept. 1 Sep 1991-31 Aug 1992


Corporate Author : FLORIDA UNIV GAINESVILLE


Personal Author(s) : Hoflund, Gar B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264753.pdf


Report Date : Mar 1993


Pagination or Media Count : 24


Abstract : The goal of this project was to produce a source which is compact, durable and mounts on a standard UHV flange for the generation of hyperthermal oxygen atoms. This has been accomplished. In this source oxygen atoms permeate through a Ag membrane held at 500 deg C and are then emitted toward the target from the vacuum side of the membrane by electron stimulated desorption (ESD). The current prototype model generates usable O-atom fluxes of about 10(exp 12) atoms/sq cm/s, and future modifications should increase this flux by 1 to 3 orders of magnitude. Based on the O+ energy distribution, the average O neutral energy is about 5 eV with a fairly broad distribution (FWHM approx. equal 3.6 EV). The information required for the development of this source and a design of the source are presented.


Descriptors :   *ATOMS , *OXYGEN , *GUNS , THERMAL PROPERTIES , SPACECRAFT , MODELS , MODIFICATION , SEMICONDUCTORS , FLANGES , MEMBRANES , ULTRAHIGH VACUUM , DESORPTION , MOUNTS , STANDARDS , ELECTRONS , TARGETS , NEUTRAL , ENERGY , SILVER ALLOYS , PROTOTYPES


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE