THE chief interest attached to electron diffraction at the time of its discovery was the abundant support it brought to the new and exciting ideas regarding a wave mechanics of material particles ...

THE letter which I wrote about the diffraction spectrum has called forth several inquiries. I have been asked how it is that in that spectrum the position of a line depends only on its wave-length, ...

Light is well known to exhibit both wave-like and particle-like properties, as imaged here in this 2015 photograph. What's less well appreciated is that matter particles also exhibit those wave-like ...