Application of a multichannel detection system to the high-resolution fast electron energy loss spectrometer

TLDR

A microchannel‑plate resistive‑anode position‑sensitive detector, equipped with a bias‑voltage divider network, was integrated into a high‑resolution fast electron energy‑loss spectrometer, and its static and scanning modes were examined, including a test measurement of the helium Rydberg series oscillator‑strength spectrum. The detector increases measurement efficiency by about 20× and improves energy resolution, especially in scanning mode where coarse scanning yields higher‑resolution spectra, as demonstrated by the helium Rydberg series oscillator‑strength measurement.

Abstract

A microchannel-plate based resistive-anode position sensitive detection system is applied to a high-resolution fast electron energy loss spectrometer. The biasing voltage divider network for the detector is investigated. The measurement efficiency is increased by about 20 times, and to some extent, the energy resolution is also improved. The static mode and the scanning mode of the spectrometer are discussed in detail. In the scanning mode, a spectrum with higher energy resolution can be obtained through a coarse scanning. As a testing experiment, the optical oscillator strength spectrum for the Rydberg series of helium is measured and the results are compared.