Reflection High-energy Electron Diffraction - RHEED System Requirements - Sample Surface

Sample Surface

The sample surface must be extremely clean for effective RHEED experiments. Contaminants on the sample surface interfere with the electron beam and degrade the quality of the RHEED pattern. RHEED users employ two main techniques to create clean sample surfaces. Small samples can be cleaved in the vacuum chamber prior to RHEED analysis. The newly exposed, cleaved surface is analyzed. Large samples, or those that are not able to be cleaved prior to RHEED analysis can be coated with a passive oxide layer prior to analysis. Subsequent heat treatment under the vacuum of the RHEED chamber removes the oxide layer and exposes the clean sample surface.

Read more about this topic:  Reflection High-energy Electron Diffraction, RHEED System Requirements

Other articles related to "sample surface, sample":

BET Theory - Derivation
... Adsorptions occur only on well-defined sites of the sample surface (one per molecule) 2 ... the heat of adsorption at the solid sample surface 4.3 ... equivalent to the sample being surrounded by a liquid phase) Let us consider a given amount of solid sample in a controlled atmosphere ...

Famous quotes containing the words surface and/or sample:

    All the aspects of this desert are beautiful, whether you behold it in fair weather or foul, or when the sun is just breaking out after a storm, and shining on its moist surface in the distance, it is so white, and pure, and level, and each slight inequality and track is so distinctly revealed; and when your eyes slide off this, they fall on the ocean.
    Henry David Thoreau (1817–1862)

    All that a city will ever allow you is an angle on it—an oblique, indirect sample of what it contains, or what passes through it; a point of view.
    Peter Conrad (b. 1948)