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Illustration Single Slit - Right Triangle for Momentum of an Electron

Single Slit - Right Triangle for Momentum of an Electron
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An electron represented by a matter wave has at the beginning only one momentum \( p = p_{\text y} \) in \(y\) direction. It points exactly in the direction of the single slit. After passing the single slit, the electron wave is diffracted. The electron momentum \(p = p_{\text y} \) has got a part \( \Delta p_{\text x} \) in \(x\) direction. This \(x\)-component represents the momentum deviation \( \Delta p_{\text x} \) from the original momentum \( p_{\text y} \).