Patel, J. R.Golovchenko, Jene2016-11-181983Patel, J. R., and J. A. Golovchenko. 1983. X-Ray-Standing-Wave Atom Location in Heteropolar Crystals and the Problem of Extinction. Physical Review Letters 50, no. 23: 1858-1861. doi:10.1103/physrevlett.50.1858.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:29407049By monitoring the characteristic fluorescent radiation excited by x-ray standing waves we have been able to distinguish the two different kinds of lattice sites in a heteropolar crystal of GaAs. The strong extinction effects that mask the position-dependent fluorescent signal were minimized by adopting a suitable detector geometry.en-USJournal Article2016-11-1810.1103/PhysRevLett.50.1858