Accession Number:

AD0680672

Title:

ON THE PHASE TRANSITION IN SOLID HYDROGEN.

Descriptive Note:

Research Communication no. 74,

Corporate Author:

DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LABS

Personal Author(s):

• Raich,John C.
• Etters,Richard D.

Report Date:

1968-10-01

Pagination or Media Count:

32.0

Abstract:

The phase transition in solid hydrogen is examined with a simple Ising-type model used for the intermolecular interactions. A statistical treatment based on Bethes method is used. For pure ortho-hydrogen, no abrupt transition between the orientationally ordered and disordered phases is found, but the molecular field approximation gives a first-order transition. In addition, the concentration dependence of the actual fcc-hcp transition temperature is interpreted in terms of this model. Author

Descriptors:

• *SOLIDIFIED GASES
• *PHASE STUDIES
• HYDROGEN
• QUANTUM THEORY
• MOLECULAR ENERGY LEVELS

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE