Observation of coherent bremsstrahlung in quasicrystalline Al–Cu–Co–Si

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Abstract
Quasicrystalline Al–Cu–Co–Si was irradiated with 200 and 400 keV electrons approximately along the zone axes. Under these conditions the X-ray spectrum contains, apart from characteristic X-ray lines, additional peaks. From the dependence of the peak energies on the kinetic electron energy it is concluded that these lines stem from coherent bremsstrahlung. The ratio of some peak energies is very close to the golden mean τ=(51/2 +1)/2. These measurements show that atoms in quasicrystalline Al–Cu–Co–Si are arranged in fairly well defined planes. It is confirmed for the first time that for the generation of coherent bremsstrahlung a periodic arrangement of atoms is not essential.

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