ETF20 High Energy Electron Time-of-Flight Spectrometer

Features:

The ETF20 electron tof spectrometer is optimized for electron energies > 1000 eV. Conventional electron tof spectrometers (like our model ETF11) are difficult to operate in the high energy range because the time-of-flights can get very short (< 10 ns). The ETF20 spectrometer allows to decelerate the electrons by a factor of up to 100.
When deceleration is used only a section of the kinetic energy spectrum can be analysed because electrons with energies smaller than the deceleration potential (i.e. drift tube potential) cannot reach the detector
Maximal deceleration voltage (drift tube potential) is -2 kV
The divergence of the electron beam caused by the their deceleration is compensated with a deceleration module consisting of several electron-optical elements. The maximal acceptance angle of the ETF20 spectrometer is 6° (full cone, size of ionization zone < 200 µm)
Minimum electron pass energy ca. 20 eV (depending on the magnetic fields of the environment
Detector is floating on the drift tube potential
The fieldfree drift zone after deceleration has a length of ca. 430 mm
The distance laser focus – entrance aperture is 25 mm, the distance laser focus – connection flange is 354 mm.
Channelplate detector with two-stage chevron geometry, channelplates with 5 µm pore size for fast response times, 40 mm active diameter
The vacuum chamber of the electron spectrometer is manufactured from non-magnetic stainless steel 1.4429 (equivalent to 316 LN). It consists of a 6” o.d. conflat (CF100)connection flange, a 6” o.d. conflat (CF100) pump flange (CF100) and a 2.75” o.d. conflat flange (CF38) for pressure metering
High voltage power supply in a 19” box, 3HE (132 mm) high, 350 mm deep. The voltages can be adjusted either with 10-turn potentiometers or via control voltages 0 - 10 V from a DA-converter

Option:

Maximal deceleration voltage of -5 kV or -10 kV