Pulsed field sample neutralization
Patent
·
OSTI ID:5071705
This patent describes an apparatus and method for alternating voltage and for varying the rate of extraction during the extraction of secondary particles, resulting in periods when either positive ions, or negative ions and electrons are extracted at varying rates. Using voltage with alternating charge during successive periods to extract particles from materials which accumulate charge opposite that being extracted causes accumulation of surface charge of opposite sign. Charge accumulation can then be adjusted to a ratio which maintains a balance of positive and negative charge emission, thus maintaining the charge neutrality of the sample.
- Assignee:
- US Dept. of Energy, Washington, DC (USA)
- Patent Number(s):
- A; US 4968888
- Application Number:
- PPN: US 7-375442
- OSTI ID:
- 5071705
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGER ELECTRON SPECTROSCOPY
BEAM NEUTRALIZATION
BEAMS
CHARGED PARTICLE DETECTION
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DETECTION
ELECTRON SPECTROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
EXTRACTION
FERMIONS
ION BEAMS
IONS
LEPTONS
MASS SPECTROSCOPY
MATERIALS
NUCLEAR REACTIONS
RADIATION DETECTION
SEPARATION PROCESSES
SPECTROSCOPY
SURFACES
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGER ELECTRON SPECTROSCOPY
BEAM NEUTRALIZATION
BEAMS
CHARGED PARTICLE DETECTION
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DETECTION
ELECTRON SPECTROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
EXTRACTION
FERMIONS
ION BEAMS
IONS
LEPTONS
MASS SPECTROSCOPY
MATERIALS
NUCLEAR REACTIONS
RADIATION DETECTION
SEPARATION PROCESSES
SPECTROSCOPY
SURFACES