Apparatus for positron annihilation-induced Auger electron spectroscopy

Journal Article · Fri Dec 01 04:00:00 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), Journal Name: Review of Scientific Instruments; (USA) Vol. 60:12; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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