To read more about the Distributed Positron Model (DPM) in SF6 (or
to reference the work) please see the following:
Robert R. Lucchese, F. A. Gianturco, P. Nichols, and Thomas L. Gibson,
"A
test calculation on SF6 of model potentials for correlation and polarization
effects in positron scattering from molecules," in New Directions in Antimatter Physics and
Chemistry, edited by F. A. Gianturco and C. Surko (Kluwer Academic,
Dordrecht, 2001) - submitted for publication.
The experimental work shown in the figure above may be found in the
following references: