Abstract
We calculated the drift velocity vector W of electron swarmsin crossed electric and magnetic fields using a Monte Carlo method. Values ofW in F2, CF4 and constant-collision-frequency (CCF)model gases at various values of the reduced electric and magnetic fields,E/N and B/N (N is the gas molecule number density), were illustrated asvector loci in velocity space. Under a CCF condition, W draws rightsemicircular loci with varying B and N at a constant E when the numberof electrons is conservative. These semicircular loci can be a reference tocharacterize the W behaviour in real gases. We presented an analyticalderivation of W in the CCF condition, extending its expression to thatin the presence of ionization and attachment. Features of the vector loci inF2 and CF4 were discussed.
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