Title: Two- and three-body correlations in simple gases
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00099390/00001
 Material Information
Title: Two- and three-body correlations in simple gases
Physical Description: xvii, 333 leaves : ill. ; 28 cm.
Language: English
Creator: Groome, Lynn James, 1950- ( Dissertant )
Gubbins, K. E. ( Thesis advisor )
Dufty, J. W. ( Thesis advisor )
O'Connell, J. P. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1977
Copyright Date: 1977
Subjects / Keywords: Kinetic theory of gases   ( lcsh )
Ideal gas law   ( lcsh )
Chemical Engineering thesis Ph. D
Dissertations, Academic -- Chemical Engineering -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Abstract: The static and dynamic behavior of a simple gas is studied both experimentally (via inelastic neutron scattering) and theoretically. Measurement of the static structure factor, S(Q), at low densities is discussed as a means for providing details concerning three-body forces. An analysis of the density expansion of the static structure factor reveals S(Q) to be insensitive to higher-order terms, i.e., S 2 (Q) and S (Q) , beyond the first Deak in S(Q) (Q > 1.5 8 _J for xenon). Also, S„(Q) is found to be most sensitive to three-body forces in the region Q ^ 1.0 A . The comparison of the viral expansion (assuming pairwise additivity and the Barker pair potential for xenon) with experimental measurements of S(Q) for low density xenon gas tentatively suggests that Barker's pair potential for xenon may be somewhat erroneous. The inclusion of three-body forces (e.g., the Axilrod-Teller dispersion potential) reduces the discrepancy between theory and experiment, particularly at the lower densities. These results suggest that a combination of uncertainty in both the pair and three-body potentials contributes Lo the difference between the theoretical calculations and what is observed experimentally. A similar study of the dynamic structure factor is proposed as a test of linear kinetic theory. The analysis of the time-offlight data is performed using the N = 6 Gross-Jackson kinetic model for a hard core fluid. A comparison of this model (assuming (i) hard spheres, and (ii) hard cores having attractive forces) with experiment indicates clearly that hard spheres are not an adequate model for xenon at the state conditions studied. The agreement between experiment and the theory for attractive spheres is quite good, and we therefore conclude that the effect of the attractive part of the xenon potential is significant in representing the collisional narrowing of S(Q,uj). The spectrometer is demonstrated to be unstable, and it is for this reason that no definite conclusions concerning the isothermal , . .. 3S(Q) . 3S(Q,oj) pressure derivatives, —r— and r~—, can be made. However, a Conor or siderable amount of structure is observed for these quantities, indicating that neutron scattering provides a sensitive probe into the structure and dynamics of dilute, simple gases.
Statement of Responsibility: by Lynn James Groome.
Thesis: Thesis--University of Florida.
Bibliography: Bibliography: leaves 328-332.
General Note: Typescript.
General Note: Vita.
 Record Information
Bibliographic ID: UF00099390
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000208708
oclc - 04119812
notis - AAX5514


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