Tsong, Tien-Tzou Department of Physics, Pennsylvania State University, University Park, Pennsylvania.
- Field ion microscope
- Atom-probe field ion microscope
- Links to Primary Literature
- Additional Readings
A technique that uses field emission of electrons or positive ions from a needle-shaped emitter to produce a magnified image of the emitter surface on a fluorescent screen. In the field electron microscope, the image reveals the variation in work function of the emitter surface. Because of the large lateral velocity of the emitted electrons, a resolution of only about 2.5 nanometers (nm) can be achieved. The large lateral velocity arises from a diffraction effect of the de Broglie wave and the large kinetic energy of electrons inside the metal; these effects are intrinsic quantum properties of particles and cannot be eliminated. The field electron microscope has been used to study adsorption and desorption of gases and vapor-deposited materials, surface migration of adsorption layers and absorbed atoms on single crystal faces, and surface reactions in catalysis. Medium-sized individual molecules such as phthalocyanin have been made visible also. See also: De Broglie wavelength; Electron microscope; Field emission; Work function (electronics)
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information