Versatile apparatus for low-energy and hyperthermal energy ion scattering spectroscopies

Abstract

A source for producing alkali ion beams for lowenergy surface scattering spectroscopies Rev. Sci. Instrum. 60, 730 (1989); 10.1063/1.1141009 Apparatus for lowenergy ion scattering spectroscopies: Imaging angular distributions and collecting angle resolved energy spectra Rev. Sci. Instrum. 57, 433 (1986); 10.1063/1.1138905Ultrahigh vacuum apparatus for combined lowenergy electron diffraction, Auger spectroscopy, MeV ion scattering, and nuclear microanalysis Rev. Sci. Instrum. 53, 797 (1982);We have designed and constructed an apparatus that combines hyperthermal energy ion scattering « lOOeV) with low-energy ion scattering (afewhundredeVtoseveralkeV). The URV scattering chamber possesses a full range of sample preparation and characterization capabilities, including LEED, Auger spectroscopy, a Kelvin probe for work function measurements, and facilities for gas or alkali-metal deposition. The differentially pumped beamline provides well-collimated, monoenergetic beams of gas or alkali-metal ions ranging in energy from < 10 e V to 10 ke V. To illustrate the qualitative changes in the scattering behavior observed over this range, we present experimental results for Na + scattered off the Cu ( 110) surface with the incident ion energy ranging from S6 e V to 4 ke V. We also show a comparison between 1 ke V K + and 1 ke V Ar+ scattered from the same surface.

Energy and angular distributions of hyperthermal-energyLi+scattered from Cu(001)

“…29 The data were obtained in a two-tiered, UHV chamber which has been described in detail elsewhere. 30 The upper tier is dedicated to the preparation of the sample surface and the lower tier is used for performing the ion scattering measurements. The upper tier contains a sputter gun, facilities for Auger electron spectroscopy ͑AES͒, and a set of reverseview low-energy electron diffraction ͑LEED͒ optics.…”

Limitations of the Trajectory Approximation in Atom-Surface Scattering

“…The scattering chamber and beam line have been described in detail elsewhere [17]. Typical The beam was incident along the (100) azimuth, with 8; = Hi = 45 .…”

Thermally Enhanced Neutralization in Hyperthermal Energy Ion Scattering

“…Our measurements were performed in an ultra high vacuum chamber and beamline that are described in detail elsewhere [15,16]. All of the ion beams were produced in a Colutron ion source that has been modified to allow highly efficient alkali ion beam production from a solid state source [17].…”