Scanning Electron Microscopes: Difference between revisions

From Physics Book
Jump to navigation Jump to search
(Created page with "compiled by Luke Portera (lportera3) This page seeks to explain the principle behind simple electromagnetic cranes. Electromagnetic cranes utilize Ampere's Law in order to li...")
 
No edit summary
Line 1: Line 1:
compiled by Luke Portera (lportera3)
compiled by Luke Portera (lportera3)


This page seeks to explain the principle behind simple electromagnetic cranes. Electromagnetic cranes utilize Ampere's Law in order to lift certain ferromagnetic objects.  
This page seeks to explain the principle behind scanning electron microscopes. Scanning Electron Microscopes are widely used in biologically based research in order to create high definition photos of microscopic subjects.


==The Main Idea==
==The Main Idea==
 
Scanning Electron Microscopes create high definition photos of these microscopic subjects by exposing them to a constant ray of electrons. When exposed to this beam of electrons, the subjects emit secondary electrons which are in turn detected and captured via image.
===A brief Summary===
===A brief Summary===


Electromagnetic cranes utilize Ampere's Law in order to lift ferromagnetic objects. Ferromagnetic objects have unpaired electrons that align themselves with the magnetic field that they are exposed to which causes. The magnetic field, in turn, applies a force to the ferromagnetic objects. Electromagnetic cranes take advantage of this phenomenon by utilizing Ampere's law in order to create the magnetic field that exerts an attractive force on the ferromagnetic objects.
Manfred Von Ardenne captured the first image of a microscopic subject using the Scanning Electron technique. Scanning Electron Microscopes are one of the most widely used scanning microscopes because they eliminate what is known as chromatic aberration. Chromatic aberration is when the lens of the microscope does not capture all colors emitted when the subject is exposed to an electron beam.


===A Mathematical Model===
===A Mathematical Model===


The main laws that an electromagnetic crane utilizes are Ampere's Law and  For example <math>{\frac{d\vec{p}}{dt}}_{system} = \vec{F}_{net}</math> where '''p''' is the momentum of the system and '''F''' is the net force from the surroundings.
For the electrons to be emitted, the machine must first create a potential across two surfaces that causes the electrons to move in a concentrated beam. We learned


===A Computational Model===
===A Computational Model===

Revision as of 21:37, 5 December 2015

compiled by Luke Portera (lportera3)

This page seeks to explain the principle behind scanning electron microscopes. Scanning Electron Microscopes are widely used in biologically based research in order to create high definition photos of microscopic subjects.

The Main Idea

Scanning Electron Microscopes create high definition photos of these microscopic subjects by exposing them to a constant ray of electrons. When exposed to this beam of electrons, the subjects emit secondary electrons which are in turn detected and captured via image.

A brief Summary

Manfred Von Ardenne captured the first image of a microscopic subject using the Scanning Electron technique. Scanning Electron Microscopes are one of the most widely used scanning microscopes because they eliminate what is known as chromatic aberration. Chromatic aberration is when the lens of the microscope does not capture all colors emitted when the subject is exposed to an electron beam.

A Mathematical Model

For the electrons to be emitted, the machine must first create a potential across two surfaces that causes the electrons to move in a concentrated beam. We learned

A Computational Model

How do we visualize or predict using this topic. Consider embedding some vpython code here Teach hands-on with GlowScript

Examples

Be sure to show all steps in your solution and include diagrams whenever possible

Simple

Middling

Difficult

Connectedness

  1. How is this topic connected to something that you are interested in?
  2. How is it connected to your major?
  3. Is there an interesting industrial application?

History

Put this idea in historical context. Give the reader the Who, What, When, Where, and Why.

See also

Are there related topics or categories in this wiki resource for the curious reader to explore? How does this topic fit into that context?

Further reading

Books, Articles or other print media on this topic

External links

Internet resources on this topic

References

This section contains the the references you used while writing this page