Ion Energy Analyzer (RPA: Retarding Potential Analyzer / RFEA: Retarding Field Energy Analyzer)
The analyzer changes the retarding voltage in a selected range and records the collector current. The retarding curve gives the ion energy-per-charge spectrum. This spectrum measurement is the primary function. Synchronized measurements of repeatable pulses also give time-resolved spectra. The RPA supplies energy selection for energy-resolved TOF systems.
Ion Energy Analyzer (XHINS-RPA)
A retarding-voltage scan gives the ion energy-per-charge spectrum. Time-resolved spectra and TOF energy selection are secondary functions.
XHINS-RPA changes the retarding voltage and measures the collector current. These data give a retarding curve and an ion energy-per-charge spectrum. This spectrum measurement is the primary function. For a repeatable pulsed ion source, synchronized I(t) measurements at fixed retarding voltages give a time-resolved spectrum. In an energy-resolved TOF system, the RPA supplies the energy-selection function. A gate, known flight path, and fast acquisition are also necessary for the TOF system.
Key Features
- Changes the retarding voltage and records collector current to measure the ion energy-per-charge spectrum
- Records the retarding curve and collector current. Calculated results include the spectral peak and energy spread.
- Uses multiple repeatable pulses to give a time-resolved spectrum
- Supplies energy selection in a TOF measurement system
Key Specifications
| Item | Specification |
|---|---|
| Energy range | 0 – keV-class (custom upper limit) |
| Current range | pA – mA (high-precision detection) |
| Energy resolution | ≤ 1 eV (grid-dependent) |
| Interfaces | KF / CF / custom flanges |