The scattering of electrons from inert gases. I. Absolute differential elastic cross sections for argon atoms

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Abstract
Absolute angular differential cross sections for the elastic scattering of electrons from argon atoms have been measured for incident electron energies from 20 to 400 eV over the angular range 20 degrees to 150 degrees . The experimental method is based on the crossed electron and modulated atom beams techniques with an electron energy resolution of 0.095 eV and an angular resolution of 2 degrees for both the incident and scattered electron beams. The experimental cross section values have been calibrated absolutely by a phaseshift analysis over the (3s23p54s2) 2P1/2, 2P3/2 resonance doublet in argon at 11.0 and 11.27 eV. At 11.18 eV, the measured phaseshifts are delta 0=5.063+or-0.050 rad, delta 1=2.533+or-0.020 rad, delta 2=1.092+or-0.020 rad, delta 3=0.112+or-0.018 rad and higher phaseshifts were calculated from an effective range expansion. These values are in good agreement with the measured values of Andrick and Bitsch (1975), but the s and d wave phaseshifts of Weingartshofer et al. (1974) are outside the experimental limits.

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