MOSSBAUER FILTRATION OF SYNCHROTRON-RADIATION AT AN ISOTOPE INTERFACE

Mossbauer filtration of synchrotron radiation (SR) due to the resonant Mossbauer scattering at an isotope interface (a plane interface betwe en different isotopes of the same chemical element) under conditions o f total internal reflection is theoretically investigated. The scheme of Mossbauer filtration of SR allows one to suppress the background co nnected with the nonresonant SR scattering because of the absence of r eflection at the isotope interface if there is no resonant scattering. It is also shown that an additional decrease of the background connec ted with SR reflection at an interface vacuum-non-Mossbauer isotope ma y be achieved if the vacuum-non-Mossbauer isotope interface has a saw- like profile. Numerical calculations illustrating advantages of the pr oposed scheme of SR Mossbauer filtration are carried out for a Fe-56/F e-57 isotope interface.