The assertion that electron diffraction experiments do not support wave-particle duality is fundamentally incorrect. When electrons are fired at a crystal lattice, they produce a characteristic diffraction pattern on a detection screen. This diffraction pattern is identical to what we observe with waves like X-rays, providing direct evidence that electrons exhibit wave-like properties while maintaining their particle nature.
Diffraction is fundamentally a wave phenomenon. When waves pass through a narrow opening or around obstacles, they spread out and create characteristic interference patterns. This behavior is impossible for classical particles, which would simply pass straight through creating a sharp shadow. The fact that electrons produce diffraction patterns proves they are behaving as waves.
The Davisson-Germer experiment in 1927 provided crucial evidence for electron wave properties. When electrons were fired at a nickel crystal, they produced a clear diffraction pattern with specific angles of maximum intensity. This matched exactly what de Broglie's wave theory predicted, confirming that electrons behave as waves with a wavelength inversely proportional to their momentum.
Wave-particle duality means electrons exhibit both wave and particle properties simultaneously. As particles, they are detected as discrete entities at specific locations. As waves, they create interference and diffraction patterns. The de Broglie equation relates their wavelength to momentum, showing that all matter has wave properties. Electron diffraction experiments demonstrate this duality perfectly.
In conclusion, electron diffraction experiments provide overwhelming evidence FOR wave-particle duality, not against it. The original claim is scientifically incorrect. Historical experiments by Davisson-Germer and Thomson, along with modern quantum mechanics, all confirm that electrons exhibit both wave and particle properties. Diffraction patterns are direct proof of wave behavior, making electron diffraction a cornerstone of quantum physics.