Elektronenlawinen bei hohen E/p

Abstracts

Current shapes of electron avalanches are calculated for low-pressure and high-E/p uniform electric field conditions. It is shown that drift velocities of electrons and positive ions and the ionisation-coefficient α for electrons can be obtained from low to highE/p-values of over several 10³ volts/cm Torr by analysing the current pulses which are measured using fast oscilloscopic techniques. Moreover, values of the diffusion energy (diffusion coefficient over mobility) of the electrons can be determined from the diffusion-broadening of the current shapes. — Values of the diffusion energy are given for methane ranging fromkT≅4 to 15 evolts corresponding toE/p≅40 to 2000 volts/cm Torr.