Apparatus for positron annihilation-induced Auger electron spectroscopy

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1140471· OSTI ID:7167491

Lei, C; Mehl, D; Koymen, A R; Gotwald, F; Jibaly, M; Weiss, A ^[1]

---

1. Physics Department, University of Texas at Arlington, Arlington, Texas 76019 (US)

The apparatus used in the first direct measurement of energy spectra of positron annihilation-induced Auger electrons is described. The apparatus consists of a magnetically guided low-energy positron beam, a UHV surface preparation and characterization chamber, and an energy spectrometer. The spectrometer includes a trochoidal monochromator and a microchannel plate detector. A permanent magnet is mounted behind the sample to produce a field gradient which redirects the outgoing Auger electrons along the spectrometer axis. The combination of trochoidal monochromator and permanent magnet permits the measurement of the total kinetic energy of Auger electrons with an effective angular acceptance of {similar to}2{pi}. The large angular acceptance and single particle detection capability of this spectrometer make it possible to perform Auger measurements using extremely low incident beam currents ({similar to}10{sup {minus}15} A), and may make it useful in other low signal experiments. The spectrometer response function is modeled and compared to experimental results for different values of the magnetic field gradient.

• OSTI ID: 7167491
• Journal Information: Review of Scientific Instruments; (USA), Vol. 60:12; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AUGER ELECTRON SPECTROSCOPY
DESIGN
MEASURING INSTRUMENTS
ANNIHILATION
BETA SOURCES
COINCIDENCE METHODS
ELECTRON DETECTION
ENERGY SPECTRA
HIGH VACUUM
MAGNETS
MONOCHROMATORS
MONTE CARLO METHOD
NAI DETECTORS
PERFORMANCE
PROTON DETECTION
RESPONSE FUNCTIONS
SODIUM 22
ALKALI METAL ISOTOPES
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED PARTICLE DETECTION
COUNTING TECHNIQUES
DETECTION
ELECTROMAGNETIC INTERACTIONS
ELECTRON SPECTROSCOPY
FUNCTIONS
INTERACTIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
PARTICLE SOURCES
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RADIOISOTOPES
SCINTILLATION COUNTERS
SODIUM ISOTOPES
SOLID SCINTILLATION DETECTORS
SPECTRA
SPECTROSCOPY
YEARS LIVING RADIOISOTOPES
400102* - Chemical & Spectral Procedures