Pulsed high-energy electron accelerator facilities
A van de Graaff accelerator delivering 3 MeV electron pulses with duration in the range 200 ps - 250 ns is used to generate charge carriers in bulk semiconductor samples or nanomaterials in dilute solution. The mobility and decay of charge carries can be detected by transient optical absorption or microwave (30 GHz) conductivity measurements on a timescale from nanoseconds to milliseconds.
The van de Graaff accelerator
A laser driven RF-gun based electron accelerator delivers picosecond pulses of electrons with energy up to 4.5 MeV. Charges/excitons produced by these pulses can be studied by time-resolved optical or terahertz conductivity measurements on timescales from picoseconds to milliseconds.
The picosecond electron accelerator