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written by Wolfgang Christian
The EJS Classical Helium Model is an example of a three-body problem that is similar to the gravitational three-body problem of a heavy sun and two light planets. The important difference is that the helium atom's two electrons repel one another, unlike the planetary case where the intraplanetary interaction is attractive.

The EJS Classical Helium Model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_mech_orbits_ClassicalHelium.jar file will run the program if Java is installed.

Please note that this resource requires at least version 1.5 of Java.
View the source code document attached to this resource
Subjects Levels Resource Types
Classical Mechanics
- Motion in Two Dimensions
= Central Forces
General Physics
- Computational Physics
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 5.0/5

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license. Additional information is available.
Rights Holder:
Wolfgang Christian
Record Cloner:
Metadata instance created March 14, 2009 by Wolfgang Christian
Record Updated:
June 3, 2014 by Andreu Glasmann
Last Update
when Cataloged:
March 14, 2009
Other Collections:

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Record Link
AIP Format
W. Christian, Computer Program CLASSICAL HELIUM MODEL, Version 1.0 (2009), WWW Document, (
W. Christian, Computer Program CLASSICAL HELIUM MODEL, Version 1.0 (2009), <>.
APA Format
Christian, W. (2009). Classical Helium Model (Version 1.0) [Computer software]. Retrieved March 31, 2015, from
Chicago Format
Christian, Wolfgang. "Classical Helium Model." Version 1.0. (accessed 31 March 2015).
MLA Format
Christian, Wolfgang. Classical Helium Model. Vers. 1.0. Computer software. 2009. Java 1.5. 31 Mar. 2015 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Classical Helium Model}, Month = {March}, Year = {2009} }
Refer Export Format

%A Wolfgang Christian
%T Classical Helium Model
%D March 14, 2009
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D March 14, 2009
%T Classical Helium Model
%7 1.0
%8 March 14, 2009

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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

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