Oct. 12 課題


Laue, German physicist, suggested (1911) that X-rays might be 
diffracted from the atoms of crystal, if these were regularly
arranged in a three-dimensional lattice. This was confirmed experimentally 
by W. Friedrich and P. Knipping (1912). If the incident X-rays form a 
narrow pencil beam and contain a continuous range of wavelengths, 
a photographic plate receiving the diffracted radiations records 
an array of Laue spots, the whole being a Laue diagram. For this work 
he was awarded a Nobel prize (1912). Laue's theory was comprehensive 
and somewhat elaborate. The Bragg treatment, which is much simpler, 
was produced soon afterwards.