Analysis of phase shift calculations used in second virial corrections for helium gas thermometry

Technical Report · Wed Mar 15 00:00:00 EST 1989

DOI:https://doi.org/10.2172/6450923· OSTI ID:6450923

McConville, G. T.

The second virial of helium has been calculated using the new potential function of Aziz in both the LeRoy and the Taylor phase shift codes. The Taylor code uses a difference method to obtain the phase shift, whereas the LeRoy code uses the arctangent method. The arctan method appears to be preferred over the difference method because of round-off errors even in double precision calculations. There is a correction resulting from the excluded portion of the potential tail in LeRoy's code which is not in Taylor's code. The calculations show that the correction in LeRoy's code has the wrong sign at energies near the magnitude of the potential minimum. 8 refs., 3 figs., 3 tabs.

• Research Organization: EG and G Mound Applied Technologies, Miamisburg, OH (USA)
• DOE Contract Number: AC04-88DP43495
• OSTI ID: 6450923
• Report Number(s): MLM-3578; ON: DE89008959
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HELIUM
VIRIAL EQUATION
PHASE SHIFT
MATHEMATICAL MODELS
A CODES
L CODES
PERTURBATION THEORY
COMPUTER CODES
ELEMENTS
EQUATIONS
FLUIDS
GASES
NONMETALS
RARE GASES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
990230 - Mathematics & Mathematical Models- (1987-1989)