Field emission microscopy


Field emission microscopy

Field emission microscopy (FEM) is an analytical technique used in materials science to investigate molecular surface structures and their electronic properties. [cite web | title = Intro to Field Emission | publisher = Field Emission / Ion Microscopy Laboratory, Purdue University, Dept. of Physics | url = http://physics.unipune.ernet.in/~fem/intro-fem.htm | accessdate = 2007-05-10] Invented by Erwin Müller in 1936, the FEM was one of the first surface analysis instruments that approached near-atomic resolution.

FEM consists of a sharp needle emitter and a detector, such as a fluorescent screen. A negative electric field is applied to the emitter, emitting electrons from the surface. An image is formed at the detector due to the different current densities, which originates from the difference in electric fields and work functions on the emitter surface by the Fowler-Nordheim equation.

ee also

*Atom Probe
*Electron microscope
*Field ion microscope
*List of surface analysis methods

References

2Introduction to field emission [ [http://physics.unipune.ernet.in/~fem/ Field Emission Laboratory ] ]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • field emission microscopy — noun a technique that uses field emission of electrons or positive ions from the needle shaped tip of an emitter to produce a magnified image of the emitter surface (showing each atom) on a fluorescent screen …   Wiktionary

  • field emission microscope — noun the instrument used in field emission microscopy …   Wiktionary

  • Field emission gun — A field emission gun is a type of electron gun in which the emitter tip is held at several kilovolts negative potential relative to a nearby electrode, so that there is sufficient potential gradient at its surface to cause field emission of… …   Wikipedia

  • Field ion microscope — Field ion microscopy (FIM) is an analytical technique used in materials science. The field ion microscope is a type of microscope that can be used to image the arrangement of atoms at the surface of a sharp metal tip.It was the first technique by …   Wikipedia

  • Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… …   Wikipedia

  • Microscopy — is the technical field of using microscopes to view samples and objects that cannot be seen with the unaided eye (objects that are not within the resolution range of the normal eye). There are three well known branches of microscopy, optical,… …   Wikipedia

  • Transmission electron microscopy — A TEM image of the polio virus. The polio virus is 30 nm in size.[1] Transmission electron microscopy (TEM) is a microscopy technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it… …   Wikipedia

  • Photoemission electron microscopy — (PEEM, also called photoelectron microscopy, PEM) is a widely used type of emission microscopy. PEEM utilizes local variations in electron emission to generate image contrast. The excitation is usually produced by UV light, synchrotron radiation… …   Wikipedia

  • Near-field scanning optical microscope — Near field scanning optical microscopy (NSOM/SNOM) is a microscopic technique for nanostructure investigation that breaks the far field resolution limit by exploiting the properties of evanescent waves. This is done by placing the detector very… …   Wikipedia

  • Scanning probe microscopy — Part of a series of articles on Nanotechnology …   Wikipedia


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.