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A MULTI-PLATFORM JAVA APPLICATION FOR CALCULATING THE FULL SPECTRUM OF HAMAKER COEFFICIENTS FOR LAYERED MATERIALS


 

 

Based on algorithms developed by V. Adrian Parsegian1 and others, Gecko Hamaker calculates Hamaker coefficients of the London Dispersion term of the van der Waals Interaction using Lifshitz theory.  Full download available for free at sourceforge.net.


Basic Overview

Gecko Hamaker is a database application which runs with the help of MySQL, an open source database available for free download.  Gecko Hamaker allows the user to load the optical/UV spectra of your materials into a MySQL database.  Gecko Hamaker creates a London Dispersion spectra for the materials in the database.  The user may then set up the layer configuration for the calculation by creating a project and assigning database materials to layers in the project. Gecko Hamaker then automatically calculates Hamaker coefficients for your project..

Hamaker constants represent the London Dispersion Force of the van der Waals attraction between two materials. London Dispersion Forces arise from the interaction between fluctuating dipoles whose frequencies lie in the optical and UV regions of the spectrum.  Therefore, Hamaker constants may be calculated from the complex dielectric constants measured in the optical/UV portions of the spectrum. Gecko Hamaker program calculates a London Dispersion spectrum for each input material spectrum.  Using the London Dispersion spectra, the program will calculate retarded Hamaker coefficients for layers of thin films.  At present, the number of layers is limited to 99.

 

How To Install and Run Gecko Hamaker

You will need both MySQL Database Software, Gecko Hamaker.  Download MySQL first and then Gecko Hamaker.  Full Instructions are recommended and available below.  

 

MySQL 5.0

http://dev.mysql.com/downloads/mysql/5.0.html

Gecko Hamaker

http://sourceforge.net/projects/geckoproj

 

User Manual and Documentation

 

Additional SourceForge Functionality

Check out the current project status including bug reports, discussion forums and all available files. 

 

1 For more information about the algorithms on which Gecko Hamaker is based see Van der Waals Forces: A Handbook for Biologists, Chemists, Engineers, and Physicists by V. Adrian Parsegian, published by Cambridge University Press, 2006.