The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 1984
Filed:
Apr. 29, 1982
Robert Baptist, Grenoble, FR;
Gerard Chauvet, Grenoble, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
The invention relates to an apparatus for determining the electron states of a material. This apparatus comprises an enclosure containing a material, means for producing electrons of energy E.sub.i such, that on then penetrating the material, they acquire an energy E.sub.f below E.sub.i, accompanied by an emission of photons having different wavelengths. The apparatus also comprises another enclosure equipped with a tube entering the vacuum enclosure and provided with an entrance slit and another tube provided with a regulatable exit slit. The apparatus also comprises a grating located in the other enclosure and etched with lines, whilst being able to rotate about an axis parallel to these lines in order to select photons of the same wavelength. The apparatus finally has means for detecting the selected photons. Application to the determination of the forbidden band of a semiconductor.