DSM 940 electron microscope

 © Technisches Museum Wien, Photo: Peter Sedlaczek
Collection Area
Technical and Scientific Principles
Physical/Chemical Fundamentals
At the moment this object is not published in the museum.

The electron microscope can do what the light-optical microscope doesn’t achieve. This device allows magnifications up to 200,000 times.

The physical properties of the beam used, particularly the diffraction, limit the possible magnification of a microscope. Objects in the order of magnitude of a wavelength (e.g. of light) are no longer seen in focus. In the case of visible light, this is around one thousandth of a millimetre. However, if electron beams are used for image formation, the limit is lowered by a factor of 1,000.

The DSM 940 from the collections of the Technisches Museum Wien (Vienna Technical Museum) is a scanning microscope. It scans the object surface in the form of a grid (as in television images). The electrons that are thrown out from the surface when impacted by the illumination beam are registered and used to create the image. Depending on the angle of deviation, the microscope can also show very small magnifications, such as 10 times. The depth of focus here is much better than that of a light-optical microscope.

Manufacturer: Carl Zeiss, Oberkochen
Date of construction: around 1993

Inv.Nr. 34841

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