Abstract: The invention concerns a method for producing nanostructures under controlled atmosphere, from compounds having a hexagonal crystalline shape, subjected to a focused laser bombardment of a gas. The invention is characterized in that it consists in using a compacted compound sample and in carrying out the process under a residual gas pressure between 1 and 3.104 Pa.

Abstract: An energy filter receiving an electronic beam oriented along an optical axis. The filter includes a deflecting system which deviates in a dispersion plane not including the optical axis the received beam and a dispersing system which guides the beam sent by the deflecting system on an optical path inscribed in the dispersion plane and returning to the deflecting system. The deflecting system brings back in alignment with the optical axis the beam coming from the dispersing system. The deflecting system consists of a single element ensuring the inverse deviations of the beam whether outgoing or incoming. The invention is useful for transmission electron microscope.

Abstract: A transportable scanning microscope assembly operating in situ comprises a light microscope column (1) which may be directly disposed on the object to be examined (19) through a supporting structure (16) withstanding pressure and defining an internal chamber (4) the lower aperture of which is limited by peripheral resilient sealing (17) intended to be disposed in abutment on the surface (19'), the chamber (4) being connected (21) to a transportable pumping device (4). In order to allow an angular range (A) of the surface (19') to be covered by the optical axis (15), the column (1) is mounted on the support (16) by means of a knee-joint (22) sealed by a metallic diaphragm (23). The invention is particularly useful in the checking of aircraft wings and mirrors.