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IJPAP Vol.48(10) [October 2010] >


Title: Elastic scattering of 4He atoms at the surface of liquid helium
Authors: K Torongey, P
M Khanna, K
K Ayodo, Y
T Sakwa, W
G Kanyeki, F
T Ekai, R
N Kimengichi, R
Rotich, S
Keywords: Elastic scattering
4He atoms
t-matrix
Potential energy
Issue Date: Oct-2010
Publisher: NISCAIR-CSIR, India
Abstract: Elastic scattering of 4He atoms when they approach the surface of 4He liquid, has been studied. The liquid surface is assumed to be uniform and the density profile is the same along and perpendicular to the surface. The incident 4He atom will interact with a large number of 4He atoms in the liquid near the surface of liquid 4He. Hence, the effective interaction of the incident particle will be due to many-body forces. The many-body forces are represented by the t-matrix. In the equation for potential energy per atom in the bulk liquid, the pair potential was replaced by the t-matrix. The Gaussian potential used in calculating the expectation value of the t-matrix is equivalent to the Lennard-Jonnes potential. The results give quantitative agreement with the corresponding experimental values for 4He for the various values of c2. The potential energy per atom in the bulk liquid obtained in this calculation is -20.130 K. The experimental energy of interaction is -20.81K, which implies that the formula derived by us for the potential energy per atom in the bulk liquid works well
Page(s): 743-748
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(10) [October 2010]

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