Hokkaido University Preprint Series in Mathematics
An inverse scattering problem for a quantized scalar field interacting ith a classical source J is considered. Assuming that J is of he form J(t, x) = JT (t)JX(x), (t, x) 2 R×R3, we represent JX (resp. T ) in terms of JT (resp. JX) and the asymptotic fields of and its onjugate field.