Haakenaasen, R.Hau, LeneGolovchenko, JenePalathingal, J. C.Peng, J. P.Asoka-Kumar, P.Lynn, K. G.2016-11-171995Haakenaasen, R., Lene Vestergaard Hau, J. A. Golovchenko, J. C. Palathingal, J. P. Peng, P. Asoka-Kumar, and K. G. Lynn. 1995. Quantum Channeling Effects for 1 MeV Positrons. Physical Review Letters 75, no. 8: 1650–1653. doi:10.1103/physrevlett.75.1650.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:29406266A high resolution angular study of positrons transmitted through a thin single crystal of Si clearly reveals a detailed fine structure due to strong quantum channeling effects. The beam transmitted in the forward direction displays many features associated with dynamical diffraction effects and long coherence lengths. Calculations are presented showing that in flight annihilation of channeled positrons can serve as a solid state probe of electron and spin densities in thin crystals.en-USJournal Article2016-11-1710.1103/PhysRevLett.75.1650