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Technion, Institute of Technology Computational Physics Course

Summary: Technion, Institute of Technology
Computational Physics Course
Solid Hydrogen
User Guide
Software and User Guide can be found at :
Or Cohen, Winter 2007
Supervised by Dr. Joan Adler
1. Introduction
In nature Hydrogen is in a gas form composed of H2 molecules. In the course of the last century it's
solid form has been studies thoroughly. The hydrogen molecule exhibit very interesting charge
distribution that make this solid a test ground for many statistical mechanics concepts.
Para,Ortho Hydrogen - in the hydrogen molecule, the distance between the two nucleus is about
0.7Angstrem, close to Bohr's radius. As a result the two protons interact magnetically, and therefore
different alignment of their spins changes the energy of the molecule. The ortho-hydrogen states
are those where the two spins are aligned together, and the para-hydrogen are those that they are
aligned in opposite directions. Assuming only J=0,1 states are energetically accessible (J total
angular+spin momentum), we find there are 3 state of ortho form (J=1) and one state of para form
(J=0). Indeed in room temperature the ortho-para ratios are 3:1 respectively. However, we expect


Source: Adler, Joan - Physics Department, Technion, Israel Institute of Technology


Collections: Physics