DEVICE FOR THE DETERMINATION OF THE DENSITY OF NON-OCCUPIED ELECTRONIC STATES OF A MATERIAL BELOW THE FERMI LEVEL

摘要

the invention relates to a device for determining the electronic states of a material.the device comprises a chamber (2) containing a material (4), means (8) for electron energies and such that, when the material.they are energy and less than eaccompanied by an emission of photons of different wavelengths; and a chamber (30) with a tube (26) into the vacuum chamber with an entry slit (38) and athe tube (28) with an exit slot (40) is adjustable; a network (32) located in the second chamber.set of features, and is able to rotate about an axis parallel to the lines for selecting wavelength photons; and detection means (12) of the photons).;application to the determination of the band gap of a semiconductor.