Davisson-Germer experiment
The Davisson–Germer experiment was a physics experiment conducted by American physicists Clinton Davisson and Lester Germer in 1923–1927, which confirmed the de Broglie hypothesis. This hypothesis, advanced by Louis de Broglie in 1924, says that particles of matter such as electrons have wave-like properties. The experiment not only played a major role in verifying the de Broglie hypothesis and demonstrated the wave–particle duality, but also was an important historical development in the establishment of quantum mechanics and of the Schrödinger equation.
According to Maxwell's equations in the late 19th century, light was thought to consist of waves of electromagnetic fields and matter was thought to consist of localized particles. However, this was challenged in Albert Einstein's 1905 paper on the photoelectric effect, which described light as discrete and localized quanta of energy (now called photons), which won him the Nobel Prize in Physics in 1921. In 1924 Louis de Broglie presented his thesis concerning the wave–particle duality theory, which proposed the idea that all matter displays the wave–particle duality of photons. According to de Broglie, for all matter and for radiation alike, the energy of the particle was related to the frequency of its associated wave by the Planck relation:
...
Wikipedia