Positron lifetime spectrometer using a DC positron beam

Xu, Jun; Moxom, Jeremy

Title: Positron lifetime spectrometer using a DC positron beam

Abstract

An entrance grid is positioned in the incident beam path of a DC beam positron lifetime spectrometer. The electrical potential difference between the sample and the entrance grid provides simultaneous acceleration of both the primary positrons and the secondary electrons. The result is a reduction in the time spread induced by the energy distribution of the secondary electrons. In addition, the sample, sample holder, entrance grid, and entrance face of the multichannel plate electron detector assembly are made parallel to each other, and are arranged at a tilt angle to the axis of the positron beam to effectively separate the path of the secondary electrons from the path of the incident positrons.

Inventors:: Xu, Jun; Moxom, Jeremy

Issue Date:: 2003-10-21

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1174542

Patent Number(s):: 6635871

Application Number:: 09/894,776

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N23/22 - by measuring secondary emission from the material

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DOE Contract Number:: AC05-00OR22725

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats


                    Xu, Jun, and Moxom, Jeremy. Positron lifetime spectrometer using a DC positron beam.  United States: N. p., 2003. 
        Web.

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                    Xu, Jun, & Moxom, Jeremy. Positron lifetime spectrometer using a DC positron beam.  United States.

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                    Xu, Jun, and Moxom, Jeremy. Tue .  
        "Positron lifetime spectrometer using a DC positron beam".  United States.  https://www.osti.gov/servlets/purl/1174542.

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@article{osti_1174542,

  title        = {Positron lifetime spectrometer using a DC positron beam},

  author       = {Xu, Jun and Moxom, Jeremy},

  abstractNote = {An entrance grid is positioned in the incident beam path of a DC beam positron lifetime spectrometer. The electrical potential difference between the sample and the entrance grid provides simultaneous acceleration of both the primary positrons and the secondary electrons. The result is a reduction in the time spread induced by the energy distribution of the secondary electrons. In addition, the sample, sample holder, entrance grid, and entrance face of the multichannel plate electron detector assembly are made parallel to each other, and are arranged at a tilt angle to the axis of the positron beam to effectively separate the path of the secondary electrons from the path of the incident positrons.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2003},

  month        = {10}

}

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Works referenced in this record:

An intense pulsed positron beam
journal, December 1994

Suzuki, Ryoichi; Kobayashi, Yoshinori; Mikado, Tomohisa
Hyperfine Interactions, Vol. 84, Issue 1
https://doi.org/10.1007/BF02060682

Measurement of the Positron Surface-State Lifetime for Al
journal, March 1984

Lynn, K. G.; Frieze, W. E.; Schultz, Peter J.
Physical Review Letters, Vol. 52, Issue 13
https://doi.org/10.1103/PhysRevLett.52.1137

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Title: Positron lifetime spectrometer using a DC positron beam

Abstract

Citation Formats

An intense pulsed positron beam journal, December 1994

Measurement of the Positron Surface-State Lifetime for Al journal, March 1984

An intense pulsed positron beam
journal, December 1994

Measurement of the Positron Surface-State Lifetime for Al
journal, March 1984