Cross sections for electron scattering from atomic gallium

The relativistic convergent close-coupling method is applied to calculate cross sections for electron scattering on atomic gallium. The integrated and momentum-transfer cross sections for elastic scattering are presented from the 4 s 2 4 p 4P 1/2,3/2 electronic states for incident energies between 0.03 eV and 1000 eV. Integrated excitation cross sections are also presented from these initial states to the 4 s 2 4[ d,f ], 4 s 2 5[ s,p,d ], 4 s 2 6[ s,p ] and 4 s 2 7 s manifolds, as well as cross sections for excitation of the 4 s 2 4 p 4P 1/2 state to the 4 s 2 4 p 4P 3/2 state. Estimates were presented for the total single ionisation cross section and total cross section for scattering on gallium in the 4P 1/2,3/2 states, including direct ionisation from the 4 p , 4 s and 3 d electrons, and excitation−autoionisation contributions from 4 s and 3 d electrons. The estimated total single ionisation cross section was found to agree well with existing experimental data.