Publication

Synchrotron-Radiation and Free-Electron Laser-Surface and Interface Spectroscopy and Spectromicroscopy

Giorgio Margaritondo
1994
Journal Articles

Abstract

Experimental breakthroughs are having a big impact on surface and interface science. We review two series of results: first, photoemission experiments performed with high (0.1 micron) lateral resolution on the scanning instrument MAXIMUM at Wisconsin. These experiments revealed, in particular, core-level shifts from place to place on cleaved semiconductor surfaces, raising serious questions about a whole class of interface formation experiments. The second series of results applied for the first time a free-electron laser (the world's brightest Vanderbilt University infrared facility) to surface and interface physics. Using the FELIPE (FEL Internal PhotoEmission) technique, we measured heterojunction band discontinuities with a few meV accuracy.

Official source

https://infoscience.epfl.ch/entities/publication/fb5bdf70-c0d0-4a7a-b47b-feedae060592

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Giorgio Margaritondo
1994
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fb5bdf70-c0d0-4a7a-b47b-feedae060592

About this result

Related concepts (31)

Laser diode

A laser diode (LD, also injection laser diode or ILD, or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. Driven by voltage, the doped p–n-transition allows for recombination of an electron with a hole. Due to the drop of the electron from a higher energy level to a lower one, radiation, in the form of an emitted photon is generated. This is spontaneous emission.

Synchrotron light source

A synchrotron light source is a source of electromagnetic radiation (EM) usually produced by a storage ring, for scientific and technical purposes. First observed in synchrotrons, synchrotron light is now produced by storage rings and other specialized particle accelerators, typically accelerating electrons. Once the high-energy electron beam has been generated, it is directed into auxiliary components such as bending magnets and insertion devices (undulators or wigglers) in storage rings and free electron lasers.

Free-electron laser

A free-electron laser (FEL) is a (fourth generation) light source producing extremely brilliant and short pulses of radiation. An FEL functions and behaves in many ways like a laser, but instead of using stimulated emission from atomic or molecular excitations, it employs relativistic electrons as a gain medium. Radiation is generated by a bunch of electrons passing through a magnetic structure (called undulator or wiggler).

Related publications (4)

Synchrotron-Radiation and Free-Electron Laser-Surface and Interface Spectroscopy and Spectromicroscopy

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Optical nanospectroscopy applications in material science

High-Resolution Spectromicroscopy with Maximum - Photoemission Spectroscopy Reaches the 1000-Angstrom Scale

Surface Photovoltage and Band Bending at Metal Gaas Interfaces - a Contact Potential Difference and Photoemission Spectroscopy Study