Experiment to measure frequency of de Broglie waves

[VonNathan]

Homework Statement

Somebody knows an experiment to measure directly frequency of de Broglie waves?

 

[drvrm]

yes there are several diffraction experiments which can measure the frequency/wavelength directly. by directly we mean events which is dependent on the frequency/wavelength of the waves.
or there can be selective absorption experment which can measure frequency.