Compact He-atom detector for high-resolution surface phonon measurements
A new compact detector for measuring the velocity distribution of He atoms scattered from an oriented single-crystal surface by the time-of-flight (TOF) method is described. In this system the scattered atoms are tagged by exciting them to the 2/sup 3/S metastable state by cross bombardment with a pulsed electron beam. After traversal of a given flight path (80.9 mm), the metastables are detected by a multichannel-plate electron multiplier, and their TOF distribution is recorded. The incident supersonic He beam is generated by a nozzle source, resulting in a very narrow energy distribution of the incident beam. The angular and energy resolutions of the detector are analyzed and its advantages and limitations are described. Finally, a demonstration of the performance of the instrument in inelastic scattering from a Cu(100) surface is presented.
- Research Organization:
- Department of Physics, Boston University, Boston, Massachusetts 02215
- OSTI ID:
- 6474116
- Journal Information:
- Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 58:6; ISSN RSINA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOM COLLISIONS
ATOMIC BEAMS
BEAMS
COLLISIONS
DIAGNOSTIC TECHNIQUES
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON MULTIPLIER DETECTORS
ELECTRON MULTIPLIERS
ELECTRON TUBES
ELECTRON-ATOM COLLISIONS
EVEN-EVEN NUCLEI
HELIUM 4
HELIUM 4 BEAMS
HELIUM ISOTOPES
INELASTIC SCATTERING
ION BEAMS
ISOTOPES
LEPTON BEAMS
LIGHT NUCLEI
MEASURING INSTRUMENTS
MICROCHANNEL ELECTRON MULTIPLIERS
NUCLEI
PARTICLE BEAMS
RADIATION DETECTORS
SCATTERING
STABLE ISOTOPES
SURFACES