An Improved Electrostatic Electron Selector

Abstract

A cylindrical electrostatic electron selector is described which provides a 10−7 ampere beam of electrons whose energy may be varied from 0 to 50 ev and whose energy spread is less than 100 mv. Space-charge problems involved in the construction of the device were overcome by the use of grids for focusing electrodes with exterior electron traps, and a non-reflecting surface for electrons made from a network of tiny tubes. The selector is provided with an energy analyzer. When used to determine the appearance potential curve of argon, the selector resolved the 2P3/2 and 2P1/2 states separated by 0.18 ev, and indicated the formation of [Formula: see text] at an energy of 0.8 ev below the threshold for A+.

Electron monochromator-mass spectrometer instrument for negative ion analysis of electronegative compounds

“…The electrostatic parallel-plate electron-energy selector (34, 35) was simple in design, but Helmholz coils were necessary to shield out stray magnetic fields. A 127" cylindrical electrostatic deflector (36)(37)(38) was one of the more popular early electron monochromator designs, because the foci of electron trajectories are located at the field boundaries. With this device, electron beams of A with energy bandwidths < 0.1 eV and energy range of 0-50 eV became available (37).…”

“…A 127" cylindrical electrostatic deflector (36)(37)(38) was one of the more popular early electron monochromator designs, because the foci of electron trajectories are located at the field boundaries. With this device, electron beams of A with energy bandwidths < 0.1 eV and energy range of 0-50 eV became available (37). But, space-charging problems in these monochromators resulted in the addition of grids, and electron-absorbing surfaces referred to as ''electron velvet."…”

The 4p6-core excited autoionising states in strontium: Classification and excitation dynamics

“…Figure 1 shows the general view of the spectrometer. The design of analyzer was similar to that described earlier in [11]. However, to avoid an influence of chemically active high-temperature strontium vapours on the performance of the analyzer, the electron optical lens system was made of molybdenum and non-magnetic stainless steel.…”

Electron ionization time‐of‐flight mass spectrometry: Historical review and current applications

“…The 1278 cylindrical electrostatic energy analyzer was developed in the late 1950s by Marmet and Kerwin (1960), and provided energy resolution of $60 meV. The 1278 cylindrical analyzer consists of a filament followed by a series of slits to collimate the electron beam before entering the cylindrical capacitor.…”