https://doi.org/10.1140/epjd/e2004-00057-7
The high-energy critical minimum in elastic electron scattering by argon
1
Institute of Physics, P.O. Box 57, 11001 Belgrade,
Serbia and Montenegro
2
Department of Applied Physics and
Mathematics, Gdańsk University of Technology, Narutowicza
11/12, 80-952 Gdańsk, Poland
Corresponding author: a marinkovic@uranus.phy.bg.ac.yu
Received:
10
July
2003
Revised:
31
October
2003
Published online:
20
April
2004
The position of high-energy critical minimum in elastic
electron-argon scattering was investigated both experimentally and
theoretically. Differential cross-sections (DCSs) were measured as
a function of both incident electron energy (
eV) and
scattering angle (
), in small steps around the
critical minimum. The position of the high-energy critical minimum
in elastic electron-argon scattering was experimentally found to
be at 
eV and 
. To cover the
energy and angular ranges of the present experiment, relevant
relativistic ab initio calculations were carried out, based
on the Dirac-Hartree-Fock method with the exchange calculated
exactly. Target polarization is described by an ab initio
potential taken from relativistic polarized orbital calculations.
The calculated position of the high-energy critical minimum is
eV, 
. It was shown that even
slight difference of fixed scattering angle close to the critical
point could affect significantly the energy dependent DCS.
Discussion of behavior of DCS in the vicinity of the critical
minimum was performed including convolution analysis in both
energy and angle.
PACS: 31.15.Ar – Ab initio calculations / 34.80.Bm – Elastic scattering of electrons by atoms and molecules
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
