A new two-dimensional particle detector for a toroidal electrostatic analyzer

Abstract

We describe a new two-dimensional detector for the detection of ions scattered from a solid target, analyzed in energy and scattering angle by a toroidal electrostatic analyzer. The detector resolves the scattering angle with a resolution of 0.4° over a range of 25°, and the ion energy with a resolution of 120 eV over a range of 2000 eV, at 100 keV ion energy. The energy resolution of the spectrometer was improved with a factor 4 relative to its previous performance with a one-dimensional scattering angle detector, while−at the same time−the dose efficiency (count/μC) was improved by a factor 5–10.

Signature of plasmon excitations in the stopping ratio of fast hydrogen clusters

“…A detailed description of the detection system and the accompanying electronics setup can be found elsewhere. 22,24,25 In a typical MEIS experiment, a fraction of the protons backscattered in the target enter in the toroidal electrostatic analyzer, whose angular acceptance is 30°, and are analyzed in angle and energy leading to two-dimensional ͑2D͒ spectra as shown in the inset of Fig. 1.…”

Methylthiolate-induced reconstruction of Ag(111): A medium energy ion scattering study

“…Data collected with total charge input of 2.5 C and 5.0 C differed only in the level of statistical noise, indicating that there was no detectable ion-induced damage to the sample. Ions scattered from the sample were detected by a moveable toroidal electrostatic analyser, the two-dimensional detector [16] of which provides 'tiles' of ion counts as a function of both ion energy and scattering angle over limited ranges of each.…”

The structure of epitaxial V2O3 films and their surfaces: A medium energy ion scattering study

“…The ion accelerator, fitted with a duoplasmatron ion source, was used in the present experiments to produce a beam of H + ions at a nominal energy of 100 keV. Ions scattered from the sample were detected by a moveable toroidal electrostatic analyser, the twodimensional (2D) detector [38] of which provides 'tiles' of ion counts as a function of both ion energy and scattering angle over limited ranges of each. The general methodology for extracting, from these raw data tiles, both the scattered-ion/energy spectra at fixed scattering angle and the angular blocking curves corresponding to scattering from a single atomic species, has been described elsewhere [37,39].…”