The dynamics of ions from a laser-ablated silver target in low pressure bac
kground atmospheres have been investigated in a simple geometry using an el
ectrical probe. A simple scattering picture for the first transmitted peak
of the observed plume splitting has been used to calculate cross sections o
f the ablated silver ions in oxygen (sigma{O-2} = 4.8 x 10(-16) cm(2)) and
in argon (sigma{Ar} = 6.7 x 10(-16) cm(2)). The dynamics of the blast wave
is well described by blast wave theory. (C) 1999 Elsevier Science B.V. All
rights reserved.