OBSERVATION OF AN INTERFERENCE EFFECT FOR FLUORESCENT X-RAYS

A peculiar angular pattern is observed from Kalpha-fluorescent x rays emitted from a Zn monoatomic layer in a Langmuir-Blodgett film onto a Au substrate. A pattern similar to Young's fringe is monitored with a non-energy-dispersive two-dimensional detector (imaging plate), and is quantitatively measured by scanning the slit with an energy-dispersiv e detector (pure Ge detector). The fringes are in close agreement with a theoretical estimate based on the interference among transmitted an d reflected waves at interfaces in the sample.