INTEGRAL PROPERTIES OF CHANNEL INTERFERENCE IN RESONANT X-RAY-SCATTERING

The integral properties of channel interference in resonant X-ray scat tering (RXS) are formally investigated. The qualitative difference bet ween vibrational and electronic state lifetime interference is elucida ted. It is shown that the integral interference term in the RXS cross section summed over all intermediate and final states is exactly equal to zero. A few experimental cases are given as illustration. As a res ult of numerical simulations it is found that the integral interferenc e term is also close to zero if only certain finite sets of intermedia te and final states are taken into account.