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Updated: Jul 11, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Superelastic electron scattering within a magnetic angle changer: determination of the angular momentum transferred
Martyn Hussey1, Andrew Murray, William MacGillivray
1School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
Abstract:
By utilizing superelastic electron scattering from laser-excited atoms within a new magnetic angle changing device, the differential cross sections for excitation of atoms by electron impact over the complete scattering geometry are determined for the first time. In the experiments described here, these techniques are combined to reveal the angular momentum transferred to calcium atoms during electron excitation to the 4(1) P(1) state, from near 0 degrees to beyond 180 degrees . The experiments are discussed, and results presented for energies of 45 and 55 eV. These results are compared to calculations using a distorted wave Born approximation.
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