When designed appropriately, the energetic electrons in InAs APD ensure that the amplification process, known as impact ionisation
, is coherent so that negligible amplification noise is generated.
In fact, it is known that impact ionisation
in bulk semiconductor materials allows for hot excitons to relax to the valence band, in turn exciting another exciton (Figure 3).
Space debris is detected by a combination of the measurement of impact ionisation
, particle velocity and foil penetration.
The Commission has also approved a project with the Comenius University in Bratislava, Slovakia, to measure electron impact ionisation
and excitation cross-sections of hydrocarbon molecules (by using crossed-beam experimental techniques), including the measurement of electron attachment cross-sections of hydrogen compounds.
detection uv-vis combines with the mass spectrometer using electron impact ionisation
and q-tof analyzer.