Question. Does a stream of Electrons emitted in a Hard Vacuum Diode absorb light? If so what is the absorption Frequency? This Question is intend for only mean free Electrons in a Hard Vacuum. I have been wanting to emit some different LASER Frequencies into a Vacuum Diode and see if the Electrons absorb light in the visible spectrum. The only thing I have to play with is a 50K Fly back Transformer, a Hard Vacuum Diode and a lack of Variable LASER frequency, I need more broad band frequencies to test.